From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Add DSI support for Renesas RZ/V2H(P) SoC.
Co-developed-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v6->v7:
- Used the new apis for calculating the PLLDSI
parameters in the DSI driver.
v5->v6:
- Made use of GENMASK() macro for PLLCLKSET0R_PLL_*,
PHYTCLKSETR_* and PHYTHSSETR_* macros.
- Replaced 10000000UL with 10 * MEGA
- Renamed mode_freq_hz to mode_freq_khz in rzv2h_dsi_mode_calc
- Replaced `i -= 1;` with `i--;`
- Renamed RZV2H_MIPI_DPHY_FOUT_MIN_IN_MEGA to
RZV2H_MIPI_DPHY_FOUT_MIN_IN_MHZ and
RZV2H_MIPI_DPHY_FOUT_MAX_IN_MEGA to
RZV2H_MIPI_DPHY_FOUT_MAX_IN_MHZ.
v4->v5:
- No changes
v3->v4
- In rzv2h_dphy_find_ulpsexit() made the array static const.
v2->v3:
- Simplifed V2H DSI timings array to save space
- Switched to use fsleep() instead of udelay()
v1->v2:
- Dropped unused macros
- Added missing LPCLK flag to rzv2h info
---
.../gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 345 ++++++++++++++++++
.../drm/renesas/rz-du/rzg2l_mipi_dsi_regs.h | 34 ++
2 files changed, 379 insertions(+)
diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
index 893a90c7a886..3b2f77665309 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
@@ -7,6 +7,7 @@
#include <linux/bitfield.h>
#include <linux/clk.h>
+#include <linux/clk/renesas-rzv2h-cpg-pll.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
@@ -46,6 +47,11 @@ struct rzg2l_mipi_dsi_hw_info {
u64 *hsfreq_millihz);
unsigned int (*dphy_mode_clk_check)(struct rzg2l_mipi_dsi *dsi,
unsigned long mode_freq);
+ struct {
+ const struct rzv2h_pll_limits **limits;
+ const u8 *table;
+ const u8 table_size;
+ } cpg_plldsi;
u32 phy_reg_offset;
u32 link_reg_offset;
unsigned long min_dclk;
@@ -53,6 +59,11 @@ struct rzg2l_mipi_dsi_hw_info {
u8 features;
};
+struct rzv2h_dsi_mode_calc {
+ unsigned long mode_freq_khz;
+ struct rzv2h_pll_pars dsi_parameters;
+};
+
struct rzg2l_mipi_dsi {
struct device *dev;
void __iomem *mmio;
@@ -75,11 +86,22 @@ struct rzg2l_mipi_dsi {
unsigned int lanes;
unsigned long mode_flags;
+ struct rzv2h_dsi_mode_calc mode_calc;
+
/* DCS buffer pointers when using external memory. */
dma_addr_t dcs_buf_phys;
u8 *dcs_buf_virt;
};
+static const struct rzv2h_pll_limits rzv2h_plldsi_div_limits = {
+ .fout = { .min = 80 * MEGA, .max = 1500 * MEGA },
+ .fvco = { .min = 1050 * MEGA, .max = 2100 * MEGA },
+ .m = { .min = 64, .max = 1023 },
+ .p = { .min = 1, .max = 4 },
+ .s = { .min = 0, .max = 5 },
+ .k = { .min = -32768, .max = 32767 },
+};
+
static inline struct rzg2l_mipi_dsi *
bridge_to_rzg2l_mipi_dsi(struct drm_bridge *bridge)
{
@@ -194,6 +216,155 @@ static const struct rzg2l_mipi_dsi_timings rzg2l_mipi_dsi_global_timings[] = {
},
};
+struct rzv2h_mipi_dsi_timings {
+ const u8 *hsfreq;
+ u8 len;
+ u8 start_index;
+};
+
+enum {
+ TCLKPRPRCTL,
+ TCLKZEROCTL,
+ TCLKPOSTCTL,
+ TCLKTRAILCTL,
+ THSPRPRCTL,
+ THSZEROCTL,
+ THSTRAILCTL,
+ TLPXCTL,
+ THSEXITCTL,
+};
+
+static const u8 tclkprprctl[] = {
+ 15, 26, 37, 47, 58, 69, 79, 90, 101, 111, 122, 133, 143, 150,
+};
+
+static const u8 tclkzeroctl[] = {
+ 9, 11, 13, 15, 18, 21, 23, 24, 25, 27, 29, 31, 34, 36, 38,
+ 41, 43, 45, 47, 50, 52, 54, 57, 59, 61, 63, 66, 68, 70, 73,
+ 75, 77, 79, 82, 84, 86, 89, 91, 93, 95, 98, 100, 102, 105,
+ 107, 109, 111, 114, 116, 118, 121, 123, 125, 127, 130, 132,
+ 134, 137, 139, 141, 143, 146, 148, 150,
+};
+
+static const u8 tclkpostctl[] = {
+ 8, 21, 34, 48, 61, 74, 88, 101, 114, 128, 141, 150,
+};
+
+static const u8 tclktrailctl[] = {
+ 14, 25, 37, 48, 59, 71, 82, 94, 105, 117, 128, 139, 150,
+};
+
+static const u8 thsprprctl[] = {
+ 11, 19, 29, 40, 50, 61, 72, 82, 93, 103, 114, 125, 135, 146, 150,
+};
+
+static const u8 thszeroctl[] = {
+ 18, 24, 29, 35, 40, 46, 51, 57, 62, 68, 73, 79, 84, 90,
+ 95, 101, 106, 112, 117, 123, 128, 134, 139, 145, 150,
+};
+
+static const u8 thstrailctl[] = {
+ 10, 21, 32, 42, 53, 64, 75, 85, 96, 107, 118, 128, 139, 150,
+};
+
+static const u8 tlpxctl[] = {
+ 13, 26, 39, 53, 66, 79, 93, 106, 119, 133, 146, 150,
+};
+
+static const u8 thsexitctl[] = {
+ 15, 23, 31, 39, 47, 55, 63, 71, 79, 87,
+ 95, 103, 111, 119, 127, 135, 143, 150,
+};
+
+static const struct rzv2h_mipi_dsi_timings rzv2h_dsi_timings_tables[] = {
+ [TCLKPRPRCTL] = {
+ .hsfreq = tclkprprctl,
+ .len = ARRAY_SIZE(tclkprprctl),
+ .start_index = 0,
+ },
+ [TCLKZEROCTL] = {
+ .hsfreq = tclkzeroctl,
+ .len = ARRAY_SIZE(tclkzeroctl),
+ .start_index = 2,
+ },
+ [TCLKPOSTCTL] = {
+ .hsfreq = tclkpostctl,
+ .len = ARRAY_SIZE(tclkpostctl),
+ .start_index = 6,
+ },
+ [TCLKTRAILCTL] = {
+ .hsfreq = tclktrailctl,
+ .len = ARRAY_SIZE(tclktrailctl),
+ .start_index = 1,
+ },
+ [THSPRPRCTL] = {
+ .hsfreq = thsprprctl,
+ .len = ARRAY_SIZE(thsprprctl),
+ .start_index = 0,
+ },
+ [THSZEROCTL] = {
+ .hsfreq = thszeroctl,
+ .len = ARRAY_SIZE(thszeroctl),
+ .start_index = 0,
+ },
+ [THSTRAILCTL] = {
+ .hsfreq = thstrailctl,
+ .len = ARRAY_SIZE(thstrailctl),
+ .start_index = 3,
+ },
+ [TLPXCTL] = {
+ .hsfreq = tlpxctl,
+ .len = ARRAY_SIZE(tlpxctl),
+ .start_index = 0,
+ },
+ [THSEXITCTL] = {
+ .hsfreq = thsexitctl,
+ .len = ARRAY_SIZE(thsexitctl),
+ .start_index = 1,
+ },
+};
+
+static u16 rzv2h_dphy_find_ulpsexit(unsigned long freq)
+{
+ static const unsigned long hsfreq[] = {
+ 1953125UL,
+ 3906250UL,
+ 7812500UL,
+ 15625000UL,
+ };
+ static const u16 ulpsexit[] = {49, 98, 195, 391};
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(hsfreq); i++) {
+ if (freq <= hsfreq[i])
+ break;
+ }
+
+ if (i == ARRAY_SIZE(hsfreq))
+ i--;
+
+ return ulpsexit[i];
+}
+
+static u16 rzv2h_dphy_find_timings_val(unsigned long freq, u8 index)
+{
+ const struct rzv2h_mipi_dsi_timings *timings;
+ u16 i;
+
+ timings = &rzv2h_dsi_timings_tables[index];
+ for (i = 0; i < timings->len; i++) {
+ unsigned long hsfreq = timings->hsfreq[i] * 10 * MEGA;
+
+ if (freq <= hsfreq)
+ break;
+ }
+
+ if (i == timings->len)
+ i--;
+
+ return timings->start_index + i;
+};
+
static void rzg2l_mipi_dsi_phy_write(struct rzg2l_mipi_dsi *dsi, u32 reg, u32 data)
{
iowrite32(data, dsi->mmio + dsi->info->phy_reg_offset + reg);
@@ -318,6 +489,150 @@ static int rzg2l_dphy_conf_clks(struct rzg2l_mipi_dsi *dsi, unsigned long mode_f
return 0;
}
+static unsigned int rzv2h_dphy_mode_clk_check(struct rzg2l_mipi_dsi *dsi,
+ unsigned long mode_freq)
+{
+ u64 hsfreq_millihz, mode_freq_hz, mode_freq_millihz;
+ struct rzv2h_pll_div_pars cpg_dsi_parameters;
+ struct rzv2h_pll_pars dsi_parameters;
+ bool parameters_found;
+ unsigned int bpp;
+
+ bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
+ mode_freq_hz = mul_u32_u32(mode_freq, KILO);
+ mode_freq_millihz = mode_freq_hz * MILLI;
+ parameters_found =
+ rzv2h_get_pll_divs_pars(dsi->info->cpg_plldsi.limits[0],
+ &cpg_dsi_parameters,
+ dsi->info->cpg_plldsi.table,
+ dsi->info->cpg_plldsi.table_size,
+ mode_freq_millihz);
+ if (!parameters_found)
+ return MODE_CLOCK_RANGE;
+
+ hsfreq_millihz = DIV_ROUND_CLOSEST_ULL(cpg_dsi_parameters.div.freq_millihz * bpp,
+ dsi->lanes);
+ parameters_found = rzv2h_get_pll_pars(&rzv2h_plldsi_div_limits,
+ &dsi_parameters, hsfreq_millihz);
+ if (!parameters_found)
+ return MODE_CLOCK_RANGE;
+
+ if (abs(dsi_parameters.error_millihz) >= 500)
+ return MODE_CLOCK_RANGE;
+
+ memcpy(&dsi->mode_calc.dsi_parameters, &dsi_parameters, sizeof(dsi_parameters));
+ dsi->mode_calc.mode_freq_khz = mode_freq;
+
+ return MODE_OK;
+}
+
+static int rzv2h_dphy_conf_clks(struct rzg2l_mipi_dsi *dsi, unsigned long mode_freq,
+ u64 *hsfreq_millihz)
+{
+ struct rzv2h_pll_pars *dsi_parameters = &dsi->mode_calc.dsi_parameters;
+ unsigned long status;
+
+ if (dsi->mode_calc.mode_freq_khz != mode_freq) {
+ status = rzv2h_dphy_mode_clk_check(dsi, mode_freq);
+ if (status != MODE_OK) {
+ dev_err(dsi->dev, "No PLL parameters found for mode clk %lu\n",
+ mode_freq);
+ return -EINVAL;
+ }
+ }
+
+ *hsfreq_millihz = dsi_parameters->freq_millihz;
+
+ return 0;
+}
+
+static int rzv2h_mipi_dsi_dphy_init(struct rzg2l_mipi_dsi *dsi,
+ u64 hsfreq_millihz)
+{
+ struct rzv2h_pll_pars *dsi_parameters = &dsi->mode_calc.dsi_parameters;
+ unsigned long lpclk_rate = clk_get_rate(dsi->lpclk);
+ u32 phytclksetr, phythssetr, phytlpxsetr, phycr;
+ struct rzg2l_mipi_dsi_timings dphy_timings;
+ u16 ulpsexit;
+ u64 hsfreq;
+
+ hsfreq = DIV_ROUND_CLOSEST_ULL(hsfreq_millihz, MILLI);
+
+ if (dsi_parameters->freq_millihz == hsfreq_millihz)
+ goto parameters_found;
+
+ if (rzv2h_get_pll_pars(&rzv2h_plldsi_div_limits,
+ dsi_parameters, hsfreq_millihz))
+ goto parameters_found;
+
+ dev_err(dsi->dev, "No PLL parameters found for HSFREQ %lluHz\n", hsfreq);
+ return -EINVAL;
+
+parameters_found:
+ dphy_timings.tclk_trail =
+ rzv2h_dphy_find_timings_val(hsfreq, TCLKTRAILCTL);
+ dphy_timings.tclk_post =
+ rzv2h_dphy_find_timings_val(hsfreq, TCLKPOSTCTL);
+ dphy_timings.tclk_zero =
+ rzv2h_dphy_find_timings_val(hsfreq, TCLKZEROCTL);
+ dphy_timings.tclk_prepare =
+ rzv2h_dphy_find_timings_val(hsfreq, TCLKPRPRCTL);
+ dphy_timings.ths_exit =
+ rzv2h_dphy_find_timings_val(hsfreq, THSEXITCTL);
+ dphy_timings.ths_trail =
+ rzv2h_dphy_find_timings_val(hsfreq, THSTRAILCTL);
+ dphy_timings.ths_zero =
+ rzv2h_dphy_find_timings_val(hsfreq, THSZEROCTL);
+ dphy_timings.ths_prepare =
+ rzv2h_dphy_find_timings_val(hsfreq, THSPRPRCTL);
+ dphy_timings.tlpx =
+ rzv2h_dphy_find_timings_val(hsfreq, TLPXCTL);
+ ulpsexit = rzv2h_dphy_find_ulpsexit(lpclk_rate);
+
+ phytclksetr = FIELD_PREP(PHYTCLKSETR_TCLKTRAILCTL, dphy_timings.tclk_trail) |
+ FIELD_PREP(PHYTCLKSETR_TCLKPOSTCTL, dphy_timings.tclk_post) |
+ FIELD_PREP(PHYTCLKSETR_TCLKZEROCTL, dphy_timings.tclk_zero) |
+ FIELD_PREP(PHYTCLKSETR_TCLKPRPRCTL, dphy_timings.tclk_prepare);
+ phythssetr = FIELD_PREP(PHYTHSSETR_THSEXITCTL, dphy_timings.ths_exit) |
+ FIELD_PREP(PHYTHSSETR_THSTRAILCTL, dphy_timings.ths_trail) |
+ FIELD_PREP(PHYTHSSETR_THSZEROCTL, dphy_timings.ths_zero) |
+ FIELD_PREP(PHYTHSSETR_THSPRPRCTL, dphy_timings.ths_prepare);
+ phytlpxsetr = rzg2l_mipi_dsi_phy_read(dsi, PHYTLPXSETR) & ~PHYTLPXSETR_TLPXCTL;
+ phytlpxsetr |= FIELD_PREP(PHYTLPXSETR_TLPXCTL, dphy_timings.tlpx);
+ phycr = rzg2l_mipi_dsi_phy_read(dsi, PHYCR) & ~GENMASK(9, 0);
+ phycr |= FIELD_PREP(PHYCR_ULPSEXIT, ulpsexit);
+
+ /* Setting all D-PHY Timings Registers */
+ rzg2l_mipi_dsi_phy_write(dsi, PHYTCLKSETR, phytclksetr);
+ rzg2l_mipi_dsi_phy_write(dsi, PHYTHSSETR, phythssetr);
+ rzg2l_mipi_dsi_phy_write(dsi, PHYTLPXSETR, phytlpxsetr);
+ rzg2l_mipi_dsi_phy_write(dsi, PHYCR, phycr);
+
+ rzg2l_mipi_dsi_phy_write(dsi, PLLCLKSET0R,
+ FIELD_PREP(PLLCLKSET0R_PLL_S, dsi_parameters->s) |
+ FIELD_PREP(PLLCLKSET0R_PLL_P, dsi_parameters->p) |
+ FIELD_PREP(PLLCLKSET0R_PLL_M, dsi_parameters->m));
+ rzg2l_mipi_dsi_phy_write(dsi, PLLCLKSET1R,
+ FIELD_PREP(PLLCLKSET1R_PLL_K, dsi_parameters->k));
+ fsleep(20);
+
+ rzg2l_mipi_dsi_phy_write(dsi, PLLENR, PLLENR_PLLEN);
+ fsleep(500);
+
+ return 0;
+}
+
+static void rzv2h_mipi_dsi_dphy_startup_late_init(struct rzg2l_mipi_dsi *dsi)
+{
+ fsleep(220);
+ rzg2l_mipi_dsi_phy_write(dsi, PHYRSTR, PHYRSTR_PHYMRSTN);
+}
+
+static void rzv2h_mipi_dsi_dphy_exit(struct rzg2l_mipi_dsi *dsi)
+{
+ rzg2l_mipi_dsi_phy_write(dsi, PLLENR, 0);
+}
+
static int rzg2l_mipi_dsi_startup(struct rzg2l_mipi_dsi *dsi,
const struct drm_display_mode *mode)
{
@@ -430,6 +745,9 @@ static void rzg2l_mipi_dsi_set_display_timing(struct rzg2l_mipi_dsi *dsi,
case 18:
vich1ppsetr = VICH1PPSETR_DT_RGB18;
break;
+ case 16:
+ vich1ppsetr = VICH1PPSETR_DT_RGB16;
+ break;
}
if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) &&
@@ -1056,6 +1374,32 @@ static void rzg2l_mipi_dsi_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
}
+RZV2H_CPG_PLL_DSI_LIMITS(rzv2h_cpg_pll_dsi_limits);
+
+static const struct rzv2h_pll_limits *rzv2h_plldsi_limits[] = {
+ &rzv2h_cpg_pll_dsi_limits,
+};
+
+static const u8 rzv2h_cpg_div_table[] = {
+ 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32,
+};
+
+static const struct rzg2l_mipi_dsi_hw_info rzv2h_mipi_dsi_info = {
+ .dphy_init = rzv2h_mipi_dsi_dphy_init,
+ .dphy_startup_late_init = rzv2h_mipi_dsi_dphy_startup_late_init,
+ .dphy_exit = rzv2h_mipi_dsi_dphy_exit,
+ .dphy_mode_clk_check = rzv2h_dphy_mode_clk_check,
+ .dphy_conf_clks = rzv2h_dphy_conf_clks,
+ .cpg_plldsi.limits = rzv2h_plldsi_limits,
+ .cpg_plldsi.table = rzv2h_cpg_div_table,
+ .cpg_plldsi.table_size = ARRAY_SIZE(rzv2h_cpg_div_table),
+ .phy_reg_offset = 0x10000,
+ .link_reg_offset = 0,
+ .min_dclk = 5440,
+ .max_dclk = 187500,
+ .features = RZ_MIPI_DSI_FEATURE_16BPP,
+};
+
static const struct rzg2l_mipi_dsi_hw_info rzg2l_mipi_dsi_info = {
.dphy_init = rzg2l_mipi_dsi_dphy_init,
.dphy_exit = rzg2l_mipi_dsi_dphy_exit,
@@ -1066,6 +1410,7 @@ static const struct rzg2l_mipi_dsi_hw_info rzg2l_mipi_dsi_info = {
};
static const struct of_device_id rzg2l_mipi_dsi_of_table[] = {
+ { .compatible = "renesas,r9a09g057-mipi-dsi", .data = &rzv2h_mipi_dsi_info, },
{ .compatible = "renesas,rzg2l-mipi-dsi", .data = &rzg2l_mipi_dsi_info, },
{ /* sentinel */ }
};
diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi_regs.h b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi_regs.h
index d8082a87d874..2bef20566648 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi_regs.h
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi_regs.h
@@ -40,6 +40,39 @@
#define DSIDPHYTIM3_THS_TRAIL(x) ((x) << 8)
#define DSIDPHYTIM3_THS_ZERO(x) ((x) << 0)
+/* RZ/V2H DPHY Registers */
+#define PLLENR 0x000
+#define PLLENR_PLLEN BIT(0)
+
+#define PHYRSTR 0x004
+#define PHYRSTR_PHYMRSTN BIT(0)
+
+#define PLLCLKSET0R 0x010
+#define PLLCLKSET0R_PLL_S GENMASK(2, 0)
+#define PLLCLKSET0R_PLL_P GENMASK(13, 8)
+#define PLLCLKSET0R_PLL_M GENMASK(25, 16)
+
+#define PLLCLKSET1R 0x014
+#define PLLCLKSET1R_PLL_K GENMASK(15, 0)
+
+#define PHYTCLKSETR 0x020
+#define PHYTCLKSETR_TCLKTRAILCTL GENMASK(7, 0)
+#define PHYTCLKSETR_TCLKPOSTCTL GENMASK(15, 8)
+#define PHYTCLKSETR_TCLKZEROCTL GENMASK(23, 16)
+#define PHYTCLKSETR_TCLKPRPRCTL GENMASK(31, 24)
+
+#define PHYTHSSETR 0x024
+#define PHYTHSSETR_THSEXITCTL GENMASK(7, 0)
+#define PHYTHSSETR_THSTRAILCTL GENMASK(15, 8)
+#define PHYTHSSETR_THSZEROCTL GENMASK(23, 16)
+#define PHYTHSSETR_THSPRPRCTL GENMASK(31, 24)
+
+#define PHYTLPXSETR 0x028
+#define PHYTLPXSETR_TLPXCTL GENMASK(7, 0)
+
+#define PHYCR 0x030
+#define PHYCR_ULPSEXIT GENMASK(9, 0)
+
/* --------------------------------------------------------*/
/* Link Status Register */
@@ -130,6 +163,7 @@
/* Video-Input Channel 1 Pixel Packet Set Register */
#define VICH1PPSETR 0x420
+#define VICH1PPSETR_DT_RGB16 (0x0e << 16)
#define VICH1PPSETR_DT_RGB18 (0x1e << 16)
#define VICH1PPSETR_DT_RGB18_LS (0x2e << 16)
#define VICH1PPSETR_DT_RGB24 (0x3e << 16)
--
2.50.1Hi,
On 28/07/2025 23:14, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> Add DSI support for Renesas RZ/V2H(P) SoC.
I think a bit longer desc would be in order, as this is not just a "add
a new compatible string" patch, but we have new registers and functions.
> Co-developed-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
> Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v6->v7:
> - Used the new apis for calculating the PLLDSI
> parameters in the DSI driver.
>
> v5->v6:
> - Made use of GENMASK() macro for PLLCLKSET0R_PLL_*,
> PHYTCLKSETR_* and PHYTHSSETR_* macros.
> - Replaced 10000000UL with 10 * MEGA
> - Renamed mode_freq_hz to mode_freq_khz in rzv2h_dsi_mode_calc
> - Replaced `i -= 1;` with `i--;`
> - Renamed RZV2H_MIPI_DPHY_FOUT_MIN_IN_MEGA to
> RZV2H_MIPI_DPHY_FOUT_MIN_IN_MHZ and
> RZV2H_MIPI_DPHY_FOUT_MAX_IN_MEGA to
> RZV2H_MIPI_DPHY_FOUT_MAX_IN_MHZ.
>
> v4->v5:
> - No changes
>
> v3->v4
> - In rzv2h_dphy_find_ulpsexit() made the array static const.
>
> v2->v3:
> - Simplifed V2H DSI timings array to save space
> - Switched to use fsleep() instead of udelay()
>
> v1->v2:
> - Dropped unused macros
> - Added missing LPCLK flag to rzv2h info
> ---
> .../gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 345 ++++++++++++++++++
> .../drm/renesas/rz-du/rzg2l_mipi_dsi_regs.h | 34 ++
> 2 files changed, 379 insertions(+)
>
> diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> index 893a90c7a886..3b2f77665309 100644
> --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> @@ -7,6 +7,7 @@
>
> #include <linux/bitfield.h>
> #include <linux/clk.h>
> +#include <linux/clk/renesas-rzv2h-cpg-pll.h>
> #include <linux/delay.h>
> #include <linux/dma-mapping.h>
> #include <linux/io.h>
> @@ -46,6 +47,11 @@ struct rzg2l_mipi_dsi_hw_info {
> u64 *hsfreq_millihz);
> unsigned int (*dphy_mode_clk_check)(struct rzg2l_mipi_dsi *dsi,
> unsigned long mode_freq);
> + struct {
> + const struct rzv2h_pll_limits **limits;
> + const u8 *table;
> + const u8 table_size;
> + } cpg_plldsi;
> u32 phy_reg_offset;
> u32 link_reg_offset;
> unsigned long min_dclk;
> @@ -53,6 +59,11 @@ struct rzg2l_mipi_dsi_hw_info {
> u8 features;
> };
>
> +struct rzv2h_dsi_mode_calc {
> + unsigned long mode_freq_khz;
> + struct rzv2h_pll_pars dsi_parameters;
> +};
> +
> struct rzg2l_mipi_dsi {
> struct device *dev;
> void __iomem *mmio;
> @@ -75,11 +86,22 @@ struct rzg2l_mipi_dsi {
> unsigned int lanes;
> unsigned long mode_flags;
>
> + struct rzv2h_dsi_mode_calc mode_calc;
> +
> /* DCS buffer pointers when using external memory. */
> dma_addr_t dcs_buf_phys;
> u8 *dcs_buf_virt;
> };
>
> +static const struct rzv2h_pll_limits rzv2h_plldsi_div_limits = {
> + .fout = { .min = 80 * MEGA, .max = 1500 * MEGA },
> + .fvco = { .min = 1050 * MEGA, .max = 2100 * MEGA },
> + .m = { .min = 64, .max = 1023 },
> + .p = { .min = 1, .max = 4 },
> + .s = { .min = 0, .max = 5 },
> + .k = { .min = -32768, .max = 32767 },
> +};
> +
> static inline struct rzg2l_mipi_dsi *
> bridge_to_rzg2l_mipi_dsi(struct drm_bridge *bridge)
> {
> @@ -194,6 +216,155 @@ static const struct rzg2l_mipi_dsi_timings rzg2l_mipi_dsi_global_timings[] = {
> },
> };
>
> +struct rzv2h_mipi_dsi_timings {
> + const u8 *hsfreq;
> + u8 len;
> + u8 start_index;
> +};
> +
> +enum {
> + TCLKPRPRCTL,
> + TCLKZEROCTL,
> + TCLKPOSTCTL,
> + TCLKTRAILCTL,
> + THSPRPRCTL,
> + THSZEROCTL,
> + THSTRAILCTL,
> + TLPXCTL,
> + THSEXITCTL,
> +};
> +
> +static const u8 tclkprprctl[] = {
> + 15, 26, 37, 47, 58, 69, 79, 90, 101, 111, 122, 133, 143, 150,
> +};
> +
> +static const u8 tclkzeroctl[] = {
> + 9, 11, 13, 15, 18, 21, 23, 24, 25, 27, 29, 31, 34, 36, 38,
> + 41, 43, 45, 47, 50, 52, 54, 57, 59, 61, 63, 66, 68, 70, 73,
> + 75, 77, 79, 82, 84, 86, 89, 91, 93, 95, 98, 100, 102, 105,
> + 107, 109, 111, 114, 116, 118, 121, 123, 125, 127, 130, 132,
> + 134, 137, 139, 141, 143, 146, 148, 150,
> +};
> +
> +static const u8 tclkpostctl[] = {
> + 8, 21, 34, 48, 61, 74, 88, 101, 114, 128, 141, 150,
> +};
> +
> +static const u8 tclktrailctl[] = {
> + 14, 25, 37, 48, 59, 71, 82, 94, 105, 117, 128, 139, 150,
> +};
> +
> +static const u8 thsprprctl[] = {
> + 11, 19, 29, 40, 50, 61, 72, 82, 93, 103, 114, 125, 135, 146, 150,
> +};
> +
> +static const u8 thszeroctl[] = {
> + 18, 24, 29, 35, 40, 46, 51, 57, 62, 68, 73, 79, 84, 90,
> + 95, 101, 106, 112, 117, 123, 128, 134, 139, 145, 150,
> +};
> +
> +static const u8 thstrailctl[] = {
> + 10, 21, 32, 42, 53, 64, 75, 85, 96, 107, 118, 128, 139, 150,
> +};
> +
> +static const u8 tlpxctl[] = {
> + 13, 26, 39, 53, 66, 79, 93, 106, 119, 133, 146, 150,
> +};
> +
> +static const u8 thsexitctl[] = {
> + 15, 23, 31, 39, 47, 55, 63, 71, 79, 87,
> + 95, 103, 111, 119, 127, 135, 143, 150,
> +};
> +
> +static const struct rzv2h_mipi_dsi_timings rzv2h_dsi_timings_tables[] = {
> + [TCLKPRPRCTL] = {
> + .hsfreq = tclkprprctl,
> + .len = ARRAY_SIZE(tclkprprctl),
> + .start_index = 0,
> + },
> + [TCLKZEROCTL] = {
> + .hsfreq = tclkzeroctl,
> + .len = ARRAY_SIZE(tclkzeroctl),
> + .start_index = 2,
> + },
> + [TCLKPOSTCTL] = {
> + .hsfreq = tclkpostctl,
> + .len = ARRAY_SIZE(tclkpostctl),
> + .start_index = 6,
> + },
> + [TCLKTRAILCTL] = {
> + .hsfreq = tclktrailctl,
> + .len = ARRAY_SIZE(tclktrailctl),
> + .start_index = 1,
> + },
> + [THSPRPRCTL] = {
> + .hsfreq = thsprprctl,
> + .len = ARRAY_SIZE(thsprprctl),
> + .start_index = 0,
> + },
> + [THSZEROCTL] = {
> + .hsfreq = thszeroctl,
> + .len = ARRAY_SIZE(thszeroctl),
> + .start_index = 0,
> + },
> + [THSTRAILCTL] = {
> + .hsfreq = thstrailctl,
> + .len = ARRAY_SIZE(thstrailctl),
> + .start_index = 3,
> + },
> + [TLPXCTL] = {
> + .hsfreq = tlpxctl,
> + .len = ARRAY_SIZE(tlpxctl),
> + .start_index = 0,
> + },
> + [THSEXITCTL] = {
> + .hsfreq = thsexitctl,
> + .len = ARRAY_SIZE(thsexitctl),
> + .start_index = 1,
> + },
> +};
> +
> +static u16 rzv2h_dphy_find_ulpsexit(unsigned long freq)
> +{
> + static const unsigned long hsfreq[] = {
> + 1953125UL,
> + 3906250UL,
> + 7812500UL,
> + 15625000UL,
> + };
> + static const u16 ulpsexit[] = {49, 98, 195, 391};
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(hsfreq); i++) {
> + if (freq <= hsfreq[i])
> + break;
> + }
> +
> + if (i == ARRAY_SIZE(hsfreq))
> + i--;
> +
> + return ulpsexit[i];
> +}
> +
> +static u16 rzv2h_dphy_find_timings_val(unsigned long freq, u8 index)
> +{
> + const struct rzv2h_mipi_dsi_timings *timings;
> + u16 i;
> +
> + timings = &rzv2h_dsi_timings_tables[index];
> + for (i = 0; i < timings->len; i++) {
> + unsigned long hsfreq = timings->hsfreq[i] * 10 * MEGA;
> +
> + if (freq <= hsfreq)
> + break;
> + }
> +
> + if (i == timings->len)
> + i--;
> +
> + return timings->start_index + i;
> +};
I have to say I really don't like this... In the minimum, the method how
this works has to be explained in a comment. These values can't really
be calculated? If we really have to deal with hardcoded values and with
that table from the docs, I would say that just replicate the table in
the driver (i.e. a struct that represents one row of the table), instead
of the method in this driver.
Or was this method added based on earlier feedback, for v3? I see
"Simplifed V2H DSI timings array to save space" in the change log. If
so, at least document it clearly.
> +
> static void rzg2l_mipi_dsi_phy_write(struct rzg2l_mipi_dsi *dsi, u32 reg, u32 data)
> {
> iowrite32(data, dsi->mmio + dsi->info->phy_reg_offset + reg);
> @@ -318,6 +489,150 @@ static int rzg2l_dphy_conf_clks(struct rzg2l_mipi_dsi *dsi, unsigned long mode_f
> return 0;
> }
>
> +static unsigned int rzv2h_dphy_mode_clk_check(struct rzg2l_mipi_dsi *dsi,
> + unsigned long mode_freq)
> +{
> + u64 hsfreq_millihz, mode_freq_hz, mode_freq_millihz;
> + struct rzv2h_pll_div_pars cpg_dsi_parameters;
> + struct rzv2h_pll_pars dsi_parameters;
> + bool parameters_found;
> + unsigned int bpp;
> +
> + bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
> + mode_freq_hz = mul_u32_u32(mode_freq, KILO);
> + mode_freq_millihz = mode_freq_hz * MILLI;
> + parameters_found =
> + rzv2h_get_pll_divs_pars(dsi->info->cpg_plldsi.limits[0],
> + &cpg_dsi_parameters,
> + dsi->info->cpg_plldsi.table,
> + dsi->info->cpg_plldsi.table_size,
> + mode_freq_millihz);
> + if (!parameters_found)
> + return MODE_CLOCK_RANGE;
> +
> + hsfreq_millihz = DIV_ROUND_CLOSEST_ULL(cpg_dsi_parameters.div.freq_millihz * bpp,
> + dsi->lanes);
> + parameters_found = rzv2h_get_pll_pars(&rzv2h_plldsi_div_limits,
> + &dsi_parameters, hsfreq_millihz);
> + if (!parameters_found)
> + return MODE_CLOCK_RANGE;
> +
> + if (abs(dsi_parameters.error_millihz) >= 500)
> + return MODE_CLOCK_RANGE;
> +
> + memcpy(&dsi->mode_calc.dsi_parameters, &dsi_parameters, sizeof(dsi_parameters));
> + dsi->mode_calc.mode_freq_khz = mode_freq;
> +
> + return MODE_OK;
> +}
> +
> +static int rzv2h_dphy_conf_clks(struct rzg2l_mipi_dsi *dsi, unsigned long mode_freq,
> + u64 *hsfreq_millihz)
> +{
> + struct rzv2h_pll_pars *dsi_parameters = &dsi->mode_calc.dsi_parameters;
> + unsigned long status;
> +
> + if (dsi->mode_calc.mode_freq_khz != mode_freq) {
> + status = rzv2h_dphy_mode_clk_check(dsi, mode_freq);
> + if (status != MODE_OK) {
> + dev_err(dsi->dev, "No PLL parameters found for mode clk %lu\n",
> + mode_freq);
> + return -EINVAL;
> + }
> + }
> +
> + *hsfreq_millihz = dsi_parameters->freq_millihz;
> +
> + return 0;
> +}
> +
> +static int rzv2h_mipi_dsi_dphy_init(struct rzg2l_mipi_dsi *dsi,
> + u64 hsfreq_millihz)
> +{
> + struct rzv2h_pll_pars *dsi_parameters = &dsi->mode_calc.dsi_parameters;
> + unsigned long lpclk_rate = clk_get_rate(dsi->lpclk);
> + u32 phytclksetr, phythssetr, phytlpxsetr, phycr;
> + struct rzg2l_mipi_dsi_timings dphy_timings;
> + u16 ulpsexit;
> + u64 hsfreq;
> +
> + hsfreq = DIV_ROUND_CLOSEST_ULL(hsfreq_millihz, MILLI);
> +
> + if (dsi_parameters->freq_millihz == hsfreq_millihz)
> + goto parameters_found;
> +
> + if (rzv2h_get_pll_pars(&rzv2h_plldsi_div_limits,
> + dsi_parameters, hsfreq_millihz))
> + goto parameters_found;
> +
> + dev_err(dsi->dev, "No PLL parameters found for HSFREQ %lluHz\n", hsfreq);
> + return -EINVAL;
> +
> +parameters_found:
Maybe:
if (dsi_parameters->freq_millihz != hsfreq_millihz &&
!rzv2h_get_pll_pars(&rzv2h_plldsi_div_limits, dsi_parameters,
hsfreq_millihz)) {
dev_err(dsi->dev, "No PLL parameters found for HSFREQ %lluHz\n",
hsfreq);
return -EINVAL;
}
keeps the flow a bit cleaner.
> + dphy_timings.tclk_trail =
> + rzv2h_dphy_find_timings_val(hsfreq, TCLKTRAILCTL);
> + dphy_timings.tclk_post =
> + rzv2h_dphy_find_timings_val(hsfreq, TCLKPOSTCTL);
> + dphy_timings.tclk_zero =
> + rzv2h_dphy_find_timings_val(hsfreq, TCLKZEROCTL);
> + dphy_timings.tclk_prepare =
> + rzv2h_dphy_find_timings_val(hsfreq, TCLKPRPRCTL);
> + dphy_timings.ths_exit =
> + rzv2h_dphy_find_timings_val(hsfreq, THSEXITCTL);
> + dphy_timings.ths_trail =
> + rzv2h_dphy_find_timings_val(hsfreq, THSTRAILCTL);
> + dphy_timings.ths_zero =
> + rzv2h_dphy_find_timings_val(hsfreq, THSZEROCTL);
> + dphy_timings.ths_prepare =
> + rzv2h_dphy_find_timings_val(hsfreq, THSPRPRCTL);
> + dphy_timings.tlpx =
> + rzv2h_dphy_find_timings_val(hsfreq, TLPXCTL);
> + ulpsexit = rzv2h_dphy_find_ulpsexit(lpclk_rate);
> +
> + phytclksetr = FIELD_PREP(PHYTCLKSETR_TCLKTRAILCTL, dphy_timings.tclk_trail) |
> + FIELD_PREP(PHYTCLKSETR_TCLKPOSTCTL, dphy_timings.tclk_post) |
> + FIELD_PREP(PHYTCLKSETR_TCLKZEROCTL, dphy_timings.tclk_zero) |
> + FIELD_PREP(PHYTCLKSETR_TCLKPRPRCTL, dphy_timings.tclk_prepare);
> + phythssetr = FIELD_PREP(PHYTHSSETR_THSEXITCTL, dphy_timings.ths_exit) |
> + FIELD_PREP(PHYTHSSETR_THSTRAILCTL, dphy_timings.ths_trail) |
> + FIELD_PREP(PHYTHSSETR_THSZEROCTL, dphy_timings.ths_zero) |
> + FIELD_PREP(PHYTHSSETR_THSPRPRCTL, dphy_timings.ths_prepare);
> + phytlpxsetr = rzg2l_mipi_dsi_phy_read(dsi, PHYTLPXSETR) & ~PHYTLPXSETR_TLPXCTL;
> + phytlpxsetr |= FIELD_PREP(PHYTLPXSETR_TLPXCTL, dphy_timings.tlpx);
> + phycr = rzg2l_mipi_dsi_phy_read(dsi, PHYCR) & ~GENMASK(9, 0);
> + phycr |= FIELD_PREP(PHYCR_ULPSEXIT, ulpsexit);
> +
> + /* Setting all D-PHY Timings Registers */
> + rzg2l_mipi_dsi_phy_write(dsi, PHYTCLKSETR, phytclksetr);
> + rzg2l_mipi_dsi_phy_write(dsi, PHYTHSSETR, phythssetr);
> + rzg2l_mipi_dsi_phy_write(dsi, PHYTLPXSETR, phytlpxsetr);
> + rzg2l_mipi_dsi_phy_write(dsi, PHYCR, phycr);
> +
> + rzg2l_mipi_dsi_phy_write(dsi, PLLCLKSET0R,
> + FIELD_PREP(PLLCLKSET0R_PLL_S, dsi_parameters->s) |
> + FIELD_PREP(PLLCLKSET0R_PLL_P, dsi_parameters->p) |
> + FIELD_PREP(PLLCLKSET0R_PLL_M, dsi_parameters->m));
> + rzg2l_mipi_dsi_phy_write(dsi, PLLCLKSET1R,
> + FIELD_PREP(PLLCLKSET1R_PLL_K, dsi_parameters->k));
> + fsleep(20);
Why sleep? Sleeps should (almost) always have a comment, explaining what
it is waiting for.
> +
> + rzg2l_mipi_dsi_phy_write(dsi, PLLENR, PLLENR_PLLEN);
> + fsleep(500);
> +
> + return 0;
> +}
> +
> +static void rzv2h_mipi_dsi_dphy_startup_late_init(struct rzg2l_mipi_dsi *dsi)
> +{
> + fsleep(220);
Especially sleeps like this, where the upper side is "open ended".
> + rzg2l_mipi_dsi_phy_write(dsi, PHYRSTR, PHYRSTR_PHYMRSTN);
> +}
> +
Tomi
Hi Tomi,
Thank you for the review.
On Thu, Aug 21, 2025 at 10:28 AM Tomi Valkeinen
<tomi.valkeinen+renesas@ideasonboard.com> wrote:
>
> Hi,
>
> On 28/07/2025 23:14, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > Add DSI support for Renesas RZ/V2H(P) SoC.
>
> I think a bit longer desc would be in order, as this is not just a "add
> a new compatible string" patch, but we have new registers and functions.
>
Sure, I'll elaborate on the commit message.
> > Co-developed-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
> > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > v6->v7:
> > - Used the new apis for calculating the PLLDSI
> > parameters in the DSI driver.
> >
> > v5->v6:
> > - Made use of GENMASK() macro for PLLCLKSET0R_PLL_*,
> > PHYTCLKSETR_* and PHYTHSSETR_* macros.
> > - Replaced 10000000UL with 10 * MEGA
> > - Renamed mode_freq_hz to mode_freq_khz in rzv2h_dsi_mode_calc
> > - Replaced `i -= 1;` with `i--;`
> > - Renamed RZV2H_MIPI_DPHY_FOUT_MIN_IN_MEGA to
> > RZV2H_MIPI_DPHY_FOUT_MIN_IN_MHZ and
> > RZV2H_MIPI_DPHY_FOUT_MAX_IN_MEGA to
> > RZV2H_MIPI_DPHY_FOUT_MAX_IN_MHZ.
> >
> > v4->v5:
> > - No changes
> >
> > v3->v4
> > - In rzv2h_dphy_find_ulpsexit() made the array static const.
> >
> > v2->v3:
> > - Simplifed V2H DSI timings array to save space
> > - Switched to use fsleep() instead of udelay()
> >
> > v1->v2:
> > - Dropped unused macros
> > - Added missing LPCLK flag to rzv2h info
> > ---
> > .../gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 345 ++++++++++++++++++
> > .../drm/renesas/rz-du/rzg2l_mipi_dsi_regs.h | 34 ++
> > 2 files changed, 379 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> > index 893a90c7a886..3b2f77665309 100644
> > --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> > +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
> > @@ -7,6 +7,7 @@
> >
> > #include <linux/bitfield.h>
> > #include <linux/clk.h>
> > +#include <linux/clk/renesas-rzv2h-cpg-pll.h>
> > #include <linux/delay.h>
> > #include <linux/dma-mapping.h>
> > #include <linux/io.h>
> > @@ -46,6 +47,11 @@ struct rzg2l_mipi_dsi_hw_info {
> > u64 *hsfreq_millihz);
> > unsigned int (*dphy_mode_clk_check)(struct rzg2l_mipi_dsi *dsi,
> > unsigned long mode_freq);
> > + struct {
> > + const struct rzv2h_pll_limits **limits;
> > + const u8 *table;
> > + const u8 table_size;
> > + } cpg_plldsi;
> > u32 phy_reg_offset;
> > u32 link_reg_offset;
> > unsigned long min_dclk;
> > @@ -53,6 +59,11 @@ struct rzg2l_mipi_dsi_hw_info {
> > u8 features;
> > };
> >
> > +struct rzv2h_dsi_mode_calc {
> > + unsigned long mode_freq_khz;
> > + struct rzv2h_pll_pars dsi_parameters;
> > +};
> > +
> > struct rzg2l_mipi_dsi {
> > struct device *dev;
> > void __iomem *mmio;
> > @@ -75,11 +86,22 @@ struct rzg2l_mipi_dsi {
> > unsigned int lanes;
> > unsigned long mode_flags;
> >
> > + struct rzv2h_dsi_mode_calc mode_calc;
> > +
> > /* DCS buffer pointers when using external memory. */
> > dma_addr_t dcs_buf_phys;
> > u8 *dcs_buf_virt;
> > };
> >
> > +static const struct rzv2h_pll_limits rzv2h_plldsi_div_limits = {
> > + .fout = { .min = 80 * MEGA, .max = 1500 * MEGA },
> > + .fvco = { .min = 1050 * MEGA, .max = 2100 * MEGA },
> > + .m = { .min = 64, .max = 1023 },
> > + .p = { .min = 1, .max = 4 },
> > + .s = { .min = 0, .max = 5 },
> > + .k = { .min = -32768, .max = 32767 },
> > +};
> > +
> > static inline struct rzg2l_mipi_dsi *
> > bridge_to_rzg2l_mipi_dsi(struct drm_bridge *bridge)
> > {
> > @@ -194,6 +216,155 @@ static const struct rzg2l_mipi_dsi_timings rzg2l_mipi_dsi_global_timings[] = {
> > },
> > };
> >
> > +struct rzv2h_mipi_dsi_timings {
> > + const u8 *hsfreq;
> > + u8 len;
> > + u8 start_index;
> > +};
> > +
> > +enum {
> > + TCLKPRPRCTL,
> > + TCLKZEROCTL,
> > + TCLKPOSTCTL,
> > + TCLKTRAILCTL,
> > + THSPRPRCTL,
> > + THSZEROCTL,
> > + THSTRAILCTL,
> > + TLPXCTL,
> > + THSEXITCTL,
> > +};
> > +
> > +static const u8 tclkprprctl[] = {
> > + 15, 26, 37, 47, 58, 69, 79, 90, 101, 111, 122, 133, 143, 150,
> > +};
> > +
> > +static const u8 tclkzeroctl[] = {
> > + 9, 11, 13, 15, 18, 21, 23, 24, 25, 27, 29, 31, 34, 36, 38,
> > + 41, 43, 45, 47, 50, 52, 54, 57, 59, 61, 63, 66, 68, 70, 73,
> > + 75, 77, 79, 82, 84, 86, 89, 91, 93, 95, 98, 100, 102, 105,
> > + 107, 109, 111, 114, 116, 118, 121, 123, 125, 127, 130, 132,
> > + 134, 137, 139, 141, 143, 146, 148, 150,
> > +};
> > +
> > +static const u8 tclkpostctl[] = {
> > + 8, 21, 34, 48, 61, 74, 88, 101, 114, 128, 141, 150,
> > +};
> > +
> > +static const u8 tclktrailctl[] = {
> > + 14, 25, 37, 48, 59, 71, 82, 94, 105, 117, 128, 139, 150,
> > +};
> > +
> > +static const u8 thsprprctl[] = {
> > + 11, 19, 29, 40, 50, 61, 72, 82, 93, 103, 114, 125, 135, 146, 150,
> > +};
> > +
> > +static const u8 thszeroctl[] = {
> > + 18, 24, 29, 35, 40, 46, 51, 57, 62, 68, 73, 79, 84, 90,
> > + 95, 101, 106, 112, 117, 123, 128, 134, 139, 145, 150,
> > +};
> > +
> > +static const u8 thstrailctl[] = {
> > + 10, 21, 32, 42, 53, 64, 75, 85, 96, 107, 118, 128, 139, 150,
> > +};
> > +
> > +static const u8 tlpxctl[] = {
> > + 13, 26, 39, 53, 66, 79, 93, 106, 119, 133, 146, 150,
> > +};
> > +
> > +static const u8 thsexitctl[] = {
> > + 15, 23, 31, 39, 47, 55, 63, 71, 79, 87,
> > + 95, 103, 111, 119, 127, 135, 143, 150,
> > +};
> > +
> > +static const struct rzv2h_mipi_dsi_timings rzv2h_dsi_timings_tables[] = {
> > + [TCLKPRPRCTL] = {
> > + .hsfreq = tclkprprctl,
> > + .len = ARRAY_SIZE(tclkprprctl),
> > + .start_index = 0,
> > + },
> > + [TCLKZEROCTL] = {
> > + .hsfreq = tclkzeroctl,
> > + .len = ARRAY_SIZE(tclkzeroctl),
> > + .start_index = 2,
> > + },
> > + [TCLKPOSTCTL] = {
> > + .hsfreq = tclkpostctl,
> > + .len = ARRAY_SIZE(tclkpostctl),
> > + .start_index = 6,
> > + },
> > + [TCLKTRAILCTL] = {
> > + .hsfreq = tclktrailctl,
> > + .len = ARRAY_SIZE(tclktrailctl),
> > + .start_index = 1,
> > + },
> > + [THSPRPRCTL] = {
> > + .hsfreq = thsprprctl,
> > + .len = ARRAY_SIZE(thsprprctl),
> > + .start_index = 0,
> > + },
> > + [THSZEROCTL] = {
> > + .hsfreq = thszeroctl,
> > + .len = ARRAY_SIZE(thszeroctl),
> > + .start_index = 0,
> > + },
> > + [THSTRAILCTL] = {
> > + .hsfreq = thstrailctl,
> > + .len = ARRAY_SIZE(thstrailctl),
> > + .start_index = 3,
> > + },
> > + [TLPXCTL] = {
> > + .hsfreq = tlpxctl,
> > + .len = ARRAY_SIZE(tlpxctl),
> > + .start_index = 0,
> > + },
> > + [THSEXITCTL] = {
> > + .hsfreq = thsexitctl,
> > + .len = ARRAY_SIZE(thsexitctl),
> > + .start_index = 1,
> > + },
> > +};
> > +
> > +static u16 rzv2h_dphy_find_ulpsexit(unsigned long freq)
> > +{
> > + static const unsigned long hsfreq[] = {
> > + 1953125UL,
> > + 3906250UL,
> > + 7812500UL,
> > + 15625000UL,
> > + };
> > + static const u16 ulpsexit[] = {49, 98, 195, 391};
> > + unsigned int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(hsfreq); i++) {
> > + if (freq <= hsfreq[i])
> > + break;
> > + }
> > +
> > + if (i == ARRAY_SIZE(hsfreq))
> > + i--;
> > +
> > + return ulpsexit[i];
> > +}
> > +
> > +static u16 rzv2h_dphy_find_timings_val(unsigned long freq, u8 index)
> > +{
> > + const struct rzv2h_mipi_dsi_timings *timings;
> > + u16 i;
> > +
> > + timings = &rzv2h_dsi_timings_tables[index];
> > + for (i = 0; i < timings->len; i++) {
> > + unsigned long hsfreq = timings->hsfreq[i] * 10 * MEGA;
> > +
> > + if (freq <= hsfreq)
> > + break;
> > + }
> > +
> > + if (i == timings->len)
> > + i--;
> > +
> > + return timings->start_index + i;
> > +};
>
> I have to say I really don't like this... In the minimum, the method how
> this works has to be explained in a comment. These values can't really
> be calculated? If we really have to deal with hardcoded values and with
> that table from the docs, I would say that just replicate the table in
> the driver (i.e. a struct that represents one row of the table), instead
> of the method in this driver.
>
> Or was this method added based on earlier feedback, for v3? I see
> "Simplifed V2H DSI timings array to save space" in the change log. If
> so, at least document it clearly.
>
As mentioned in the previous thread, we will have to live with the
lookup tables. I'll add some comments for it.
> > +
> > static void rzg2l_mipi_dsi_phy_write(struct rzg2l_mipi_dsi *dsi, u32 reg, u32 data)
> > {
> > iowrite32(data, dsi->mmio + dsi->info->phy_reg_offset + reg);
> > @@ -318,6 +489,150 @@ static int rzg2l_dphy_conf_clks(struct rzg2l_mipi_dsi *dsi, unsigned long mode_f
> > return 0;
> > }
> >
> > +static unsigned int rzv2h_dphy_mode_clk_check(struct rzg2l_mipi_dsi *dsi,
> > + unsigned long mode_freq)
> > +{
> > + u64 hsfreq_millihz, mode_freq_hz, mode_freq_millihz;
> > + struct rzv2h_pll_div_pars cpg_dsi_parameters;
> > + struct rzv2h_pll_pars dsi_parameters;
> > + bool parameters_found;
> > + unsigned int bpp;
> > +
> > + bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
> > + mode_freq_hz = mul_u32_u32(mode_freq, KILO);
> > + mode_freq_millihz = mode_freq_hz * MILLI;
> > + parameters_found =
> > + rzv2h_get_pll_divs_pars(dsi->info->cpg_plldsi.limits[0],
> > + &cpg_dsi_parameters,
> > + dsi->info->cpg_plldsi.table,
> > + dsi->info->cpg_plldsi.table_size,
> > + mode_freq_millihz);
> > + if (!parameters_found)
> > + return MODE_CLOCK_RANGE;
> > +
> > + hsfreq_millihz = DIV_ROUND_CLOSEST_ULL(cpg_dsi_parameters.div.freq_millihz * bpp,
> > + dsi->lanes);
> > + parameters_found = rzv2h_get_pll_pars(&rzv2h_plldsi_div_limits,
> > + &dsi_parameters, hsfreq_millihz);
> > + if (!parameters_found)
> > + return MODE_CLOCK_RANGE;
> > +
> > + if (abs(dsi_parameters.error_millihz) >= 500)
> > + return MODE_CLOCK_RANGE;
> > +
> > + memcpy(&dsi->mode_calc.dsi_parameters, &dsi_parameters, sizeof(dsi_parameters));
> > + dsi->mode_calc.mode_freq_khz = mode_freq;
> > +
> > + return MODE_OK;
> > +}
> > +
> > +static int rzv2h_dphy_conf_clks(struct rzg2l_mipi_dsi *dsi, unsigned long mode_freq,
> > + u64 *hsfreq_millihz)
> > +{
> > + struct rzv2h_pll_pars *dsi_parameters = &dsi->mode_calc.dsi_parameters;
> > + unsigned long status;
> > +
> > + if (dsi->mode_calc.mode_freq_khz != mode_freq) {
> > + status = rzv2h_dphy_mode_clk_check(dsi, mode_freq);
> > + if (status != MODE_OK) {
> > + dev_err(dsi->dev, "No PLL parameters found for mode clk %lu\n",
> > + mode_freq);
> > + return -EINVAL;
> > + }
> > + }
> > +
> > + *hsfreq_millihz = dsi_parameters->freq_millihz;
> > +
> > + return 0;
> > +}
> > +
> > +static int rzv2h_mipi_dsi_dphy_init(struct rzg2l_mipi_dsi *dsi,
> > + u64 hsfreq_millihz)
> > +{
> > + struct rzv2h_pll_pars *dsi_parameters = &dsi->mode_calc.dsi_parameters;
> > + unsigned long lpclk_rate = clk_get_rate(dsi->lpclk);
> > + u32 phytclksetr, phythssetr, phytlpxsetr, phycr;
> > + struct rzg2l_mipi_dsi_timings dphy_timings;
> > + u16 ulpsexit;
> > + u64 hsfreq;
> > +
> > + hsfreq = DIV_ROUND_CLOSEST_ULL(hsfreq_millihz, MILLI);
> > +
> > + if (dsi_parameters->freq_millihz == hsfreq_millihz)
> > + goto parameters_found;
> > +
> > + if (rzv2h_get_pll_pars(&rzv2h_plldsi_div_limits,
> > + dsi_parameters, hsfreq_millihz))
> > + goto parameters_found;
> > +
> > + dev_err(dsi->dev, "No PLL parameters found for HSFREQ %lluHz\n", hsfreq);
> > + return -EINVAL;
> > +
> > +parameters_found:
>
> Maybe:
>
> if (dsi_parameters->freq_millihz != hsfreq_millihz &&
> !rzv2h_get_pll_pars(&rzv2h_plldsi_div_limits, dsi_parameters,
> hsfreq_millihz)) {
> dev_err(dsi->dev, "No PLL parameters found for HSFREQ %lluHz\n",
> hsfreq);
> return -EINVAL;
> }
>
> keeps the flow a bit cleaner.
>
Agreed, I will update as above.
> > + dphy_timings.tclk_trail =
> > + rzv2h_dphy_find_timings_val(hsfreq, TCLKTRAILCTL);
> > + dphy_timings.tclk_post =
> > + rzv2h_dphy_find_timings_val(hsfreq, TCLKPOSTCTL);
> > + dphy_timings.tclk_zero =
> > + rzv2h_dphy_find_timings_val(hsfreq, TCLKZEROCTL);
> > + dphy_timings.tclk_prepare =
> > + rzv2h_dphy_find_timings_val(hsfreq, TCLKPRPRCTL);
> > + dphy_timings.ths_exit =
> > + rzv2h_dphy_find_timings_val(hsfreq, THSEXITCTL);
> > + dphy_timings.ths_trail =
> > + rzv2h_dphy_find_timings_val(hsfreq, THSTRAILCTL);
> > + dphy_timings.ths_zero =
> > + rzv2h_dphy_find_timings_val(hsfreq, THSZEROCTL);
> > + dphy_timings.ths_prepare =
> > + rzv2h_dphy_find_timings_val(hsfreq, THSPRPRCTL);
> > + dphy_timings.tlpx =
> > + rzv2h_dphy_find_timings_val(hsfreq, TLPXCTL);
> > + ulpsexit = rzv2h_dphy_find_ulpsexit(lpclk_rate);
> > +
> > + phytclksetr = FIELD_PREP(PHYTCLKSETR_TCLKTRAILCTL, dphy_timings.tclk_trail) |
> > + FIELD_PREP(PHYTCLKSETR_TCLKPOSTCTL, dphy_timings.tclk_post) |
> > + FIELD_PREP(PHYTCLKSETR_TCLKZEROCTL, dphy_timings.tclk_zero) |
> > + FIELD_PREP(PHYTCLKSETR_TCLKPRPRCTL, dphy_timings.tclk_prepare);
> > + phythssetr = FIELD_PREP(PHYTHSSETR_THSEXITCTL, dphy_timings.ths_exit) |
> > + FIELD_PREP(PHYTHSSETR_THSTRAILCTL, dphy_timings.ths_trail) |
> > + FIELD_PREP(PHYTHSSETR_THSZEROCTL, dphy_timings.ths_zero) |
> > + FIELD_PREP(PHYTHSSETR_THSPRPRCTL, dphy_timings.ths_prepare);
> > + phytlpxsetr = rzg2l_mipi_dsi_phy_read(dsi, PHYTLPXSETR) & ~PHYTLPXSETR_TLPXCTL;
> > + phytlpxsetr |= FIELD_PREP(PHYTLPXSETR_TLPXCTL, dphy_timings.tlpx);
> > + phycr = rzg2l_mipi_dsi_phy_read(dsi, PHYCR) & ~GENMASK(9, 0);
> > + phycr |= FIELD_PREP(PHYCR_ULPSEXIT, ulpsexit);
> > +
> > + /* Setting all D-PHY Timings Registers */
> > + rzg2l_mipi_dsi_phy_write(dsi, PHYTCLKSETR, phytclksetr);
> > + rzg2l_mipi_dsi_phy_write(dsi, PHYTHSSETR, phythssetr);
> > + rzg2l_mipi_dsi_phy_write(dsi, PHYTLPXSETR, phytlpxsetr);
> > + rzg2l_mipi_dsi_phy_write(dsi, PHYCR, phycr);
> > +
> > + rzg2l_mipi_dsi_phy_write(dsi, PLLCLKSET0R,
> > + FIELD_PREP(PLLCLKSET0R_PLL_S, dsi_parameters->s) |
> > + FIELD_PREP(PLLCLKSET0R_PLL_P, dsi_parameters->p) |
> > + FIELD_PREP(PLLCLKSET0R_PLL_M, dsi_parameters->m));
> > + rzg2l_mipi_dsi_phy_write(dsi, PLLCLKSET1R,
> > + FIELD_PREP(PLLCLKSET1R_PLL_K, dsi_parameters->k));
> > + fsleep(20);
>
> Why sleep? Sleeps should (almost) always have a comment, explaining what
> it is waiting for.
>
Sure, I will add comments here (and below).
Cheers,
Prabhakar
> > +
> > + rzg2l_mipi_dsi_phy_write(dsi, PLLENR, PLLENR_PLLEN);
> > + fsleep(500);
> > +
> > + return 0;
> > +}
> > +
> > +static void rzv2h_mipi_dsi_dphy_startup_late_init(struct rzg2l_mipi_dsi *dsi)
> > +{
> > + fsleep(220);
>
> Especially sleeps like this, where the upper side is "open ended".
>
> > + rzg2l_mipi_dsi_phy_write(dsi, PHYRSTR, PHYRSTR_PHYMRSTN);
> > +}
> > +
>
> Tomi
>
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