Function mtk_dsi_ps_control() is a subset of mtk_dsi_ps_control_vact():
merge the two in one mtk_dsi_ps_control() function by adding one
function parameter `config_vact` which, when true, writes the VACT
related registers.

Reviewed-by: Fei Shao <fshao@chromium.org>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 78 ++++++++++--------------------
 1 file changed, 25 insertions(+), 53 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 8af0afbe9e3d..0a83875ec1ba 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -351,40 +351,6 @@ static void mtk_dsi_set_vm_cmd(struct mtk_dsi *dsi)
 	mtk_dsi_mask(dsi, DSI_VM_CMD_CON, TS_VFP_EN, TS_VFP_EN);
 }
 
-static void mtk_dsi_ps_control_vact(struct mtk_dsi *dsi)
-{
-	struct videomode *vm = &dsi->vm;
-	u32 dsi_buf_bpp, ps_wc;
-	u32 ps_bpp_mode;
-
-	if (dsi->format == MIPI_DSI_FMT_RGB565)
-		dsi_buf_bpp = 2;
-	else
-		dsi_buf_bpp = 3;
-
-	ps_wc = vm->hactive * dsi_buf_bpp;
-	ps_bpp_mode = ps_wc;
-
-	switch (dsi->format) {
-	case MIPI_DSI_FMT_RGB888:
-		ps_bpp_mode |= PACKED_PS_24BIT_RGB888;
-		break;
-	case MIPI_DSI_FMT_RGB666:
-		ps_bpp_mode |= LOOSELY_PS_24BIT_RGB666;
-		break;
-	case MIPI_DSI_FMT_RGB666_PACKED:
-		ps_bpp_mode |= PACKED_PS_18BIT_RGB666;
-		break;
-	case MIPI_DSI_FMT_RGB565:
-		ps_bpp_mode |= PACKED_PS_16BIT_RGB565;
-		break;
-	}
-
-	writel(vm->vactive, dsi->regs + DSI_VACT_NL);
-	writel(ps_bpp_mode, dsi->regs + DSI_PSCTRL);
-	writel(ps_wc, dsi->regs + DSI_HSTX_CKL_WC);
-}
-
 static void mtk_dsi_rxtx_control(struct mtk_dsi *dsi)
 {
 	u32 tmp_reg;
@@ -416,36 +382,42 @@ static void mtk_dsi_rxtx_control(struct mtk_dsi *dsi)
 	writel(tmp_reg, dsi->regs + DSI_TXRX_CTRL);
 }
 
-static void mtk_dsi_ps_control(struct mtk_dsi *dsi)
+static void mtk_dsi_ps_control(struct mtk_dsi *dsi, bool config_vact)
 {
-	u32 dsi_tmp_buf_bpp;
-	u32 tmp_reg;
+	struct videomode *vm = &dsi->vm;
+	u32 dsi_buf_bpp, ps_wc;
+	u32 ps_bpp_mode;
+
+	if (dsi->format == MIPI_DSI_FMT_RGB565)
+		dsi_buf_bpp = 2;
+	else
+		dsi_buf_bpp = 3;
+
+	ps_wc = vm->hactive * dsi_buf_bpp;
+	ps_bpp_mode = ps_wc;
 
 	switch (dsi->format) {
+	default:
+		fallthrough;
 	case MIPI_DSI_FMT_RGB888:
-		tmp_reg = PACKED_PS_24BIT_RGB888;
-		dsi_tmp_buf_bpp = 3;
+		ps_bpp_mode |= PACKED_PS_24BIT_RGB888;
 		break;
 	case MIPI_DSI_FMT_RGB666:
-		tmp_reg = LOOSELY_PS_24BIT_RGB666;
-		dsi_tmp_buf_bpp = 3;
+		ps_bpp_mode |= LOOSELY_PS_24BIT_RGB666;
 		break;
 	case MIPI_DSI_FMT_RGB666_PACKED:
-		tmp_reg = PACKED_PS_18BIT_RGB666;
-		dsi_tmp_buf_bpp = 3;
+		ps_bpp_mode |= PACKED_PS_18BIT_RGB666;
 		break;
 	case MIPI_DSI_FMT_RGB565:
-		tmp_reg = PACKED_PS_16BIT_RGB565;
-		dsi_tmp_buf_bpp = 2;
-		break;
-	default:
-		tmp_reg = PACKED_PS_24BIT_RGB888;
-		dsi_tmp_buf_bpp = 3;
+		ps_bpp_mode |= PACKED_PS_16BIT_RGB565;
 		break;
 	}
 
-	tmp_reg += dsi->vm.hactive * dsi_tmp_buf_bpp & DSI_PS_WC;
-	writel(tmp_reg, dsi->regs + DSI_PSCTRL);
+	if (config_vact) {
+		writel(vm->vactive, dsi->regs + DSI_VACT_NL);
+		writel(ps_wc, dsi->regs + DSI_HSTX_CKL_WC);
+	}
+	writel(ps_bpp_mode, dsi->regs + DSI_PSCTRL);
 }
 
 static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
@@ -521,7 +493,7 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
 	writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
 	writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
 
-	mtk_dsi_ps_control(dsi);
+	mtk_dsi_ps_control(dsi, false);
 }
 
 static void mtk_dsi_start(struct mtk_dsi *dsi)
@@ -666,7 +638,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 	mtk_dsi_reset_engine(dsi);
 	mtk_dsi_phy_timconfig(dsi);
 
-	mtk_dsi_ps_control_vact(dsi);
+	mtk_dsi_ps_control(dsi, true);
 	mtk_dsi_set_vm_cmd(dsi);
 	mtk_dsi_config_vdo_timing(dsi);
 	mtk_dsi_set_interrupt_enable(dsi);
-- 
2.43.0