OVL_CON_CLRFMT_MAN is a configuration for extending color format
settings of DISP_REG_OVL_CON(n).
It will change some of the original color format settings.

Take the settings of (3 << 12) for example.
- If OVL_CON_CLRFMT_MAN = 0 means OVL_CON_CLRFMT_RGBA8888.
- If OVL_CON_CLRFMT_MAN = 1 means OVL_CON_CLRFMT_PARGB8888.

Since OVL_CON_CLRFMT_MAN is not supported on previous SoCs,
It breaks the OVL color format setting of MT8173.

Therefore, the fmt_convert function pointer is added to the driver data
and mtk_ovl_fmt_convert_with_blend is implemented for MT8192 and MT8195
that support OVL_CON_CLRFMT_MAN, and mtk_ovl_fmt_convert is implemented
for other SoCs that do not support it to solve the degradation problem.

Fixes: a3f7f7ef4bfe ("drm/mediatek: Support "Pre-multiplied" blending in OVL")
Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
Tested-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 68 ++++++++++++++++++++++---
 1 file changed, 61 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 89b439dcf3a6..8f7b7e07aeb1 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -143,6 +143,7 @@ struct mtk_disp_ovl_data {
 	unsigned int addr;
 	unsigned int gmc_bits;
 	unsigned int layer_nr;
+	unsigned int (*fmt_convert)(struct device *dev, struct mtk_plane_state *state);
 	bool fmt_rgb565_is_0;
 	bool smi_id_en;
 	bool supports_afbc;
@@ -386,13 +387,59 @@ void mtk_ovl_layer_off(struct device *dev, unsigned int idx,
 		      DISP_REG_OVL_RDMA_CTRL(idx));
 }
 
-static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl, unsigned int fmt,
-				    unsigned int blend_mode)
+static unsigned int mtk_ovl_fmt_convert(struct device *dev, struct mtk_plane_state *state)
 {
-	/* The return value in switch "MEM_MODE_INPUT_FORMAT_XXX"
-	 * is defined in mediatek HW data sheet.
-	 * The alphabet order in XXX is no relation to data
-	 * arrangement in memory.
+	struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
+	unsigned int fmt = state->pending.format;
+
+	switch (fmt) {
+	default:
+	case DRM_FORMAT_RGB565:
+		return OVL_CON_CLRFMT_RGB565(ovl);
+	case DRM_FORMAT_BGR565:
+		return OVL_CON_CLRFMT_RGB565(ovl) | OVL_CON_BYTE_SWAP;
+	case DRM_FORMAT_RGB888:
+		return OVL_CON_CLRFMT_RGB888(ovl);
+	case DRM_FORMAT_BGR888:
+		return OVL_CON_CLRFMT_RGB888(ovl) | OVL_CON_BYTE_SWAP;
+	case DRM_FORMAT_RGBX8888:
+	case DRM_FORMAT_RGBA8888:
+	case DRM_FORMAT_RGBX1010102:
+	case DRM_FORMAT_RGBA1010102:
+		return OVL_CON_CLRFMT_RGBA8888;
+	case DRM_FORMAT_BGRX8888:
+	case DRM_FORMAT_BGRA8888:
+	case DRM_FORMAT_BGRX1010102:
+	case DRM_FORMAT_BGRA1010102:
+		return OVL_CON_CLRFMT_BGRA8888;
+	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_XRGB2101010:
+	case DRM_FORMAT_ARGB2101010:
+		return OVL_CON_CLRFMT_ARGB8888;
+	case DRM_FORMAT_XBGR8888:
+	case DRM_FORMAT_ABGR8888:
+	case DRM_FORMAT_XBGR2101010:
+	case DRM_FORMAT_ABGR2101010:
+		return OVL_CON_CLRFMT_ABGR8888;
+	case DRM_FORMAT_UYVY:
+		return OVL_CON_CLRFMT_UYVY | OVL_CON_MTX_YUV_TO_RGB;
+	case DRM_FORMAT_YUYV:
+		return OVL_CON_CLRFMT_YUYV | OVL_CON_MTX_YUV_TO_RGB;
+	}
+}
+
+static unsigned int mtk_ovl_fmt_convert_with_blend(struct device *dev,
+						   struct mtk_plane_state *state)
+{
+	struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
+	unsigned int fmt = state->pending.format;
+	unsigned int blend_mode = state->base.pixel_blend_mode;
+
+	/*
+	 * For the platforms where OVL_CON_CLRFMT_MAN is defined in the
+	 * hardware data sheet and supports premultiplied color formats
+	 * such as OVL_CON_CLRFMT_PARGB8888.
 	 */
 	switch (fmt) {
 	default:
@@ -471,7 +518,7 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
 		return;
 	}
 
-	con = ovl_fmt_convert(ovl, fmt, blend_mode);
+	con = ovl->data->fmt_convert(dev, state);
 	if (state->base.fb) {
 		con |= OVL_CON_AEN;
 		con |= state->base.alpha & OVL_CON_ALPHA;
@@ -625,6 +672,7 @@ static const struct mtk_disp_ovl_data mt2701_ovl_driver_data = {
 	.addr = DISP_REG_OVL_ADDR_MT2701,
 	.gmc_bits = 8,
 	.layer_nr = 4,
+	.fmt_convert = mtk_ovl_fmt_convert,
 	.fmt_rgb565_is_0 = false,
 	.formats = mt8173_formats,
 	.num_formats = ARRAY_SIZE(mt8173_formats),
@@ -634,6 +682,7 @@ static const struct mtk_disp_ovl_data mt8173_ovl_driver_data = {
 	.addr = DISP_REG_OVL_ADDR_MT8173,
 	.gmc_bits = 8,
 	.layer_nr = 4,
+	.fmt_convert = mtk_ovl_fmt_convert,
 	.fmt_rgb565_is_0 = true,
 	.formats = mt8173_formats,
 	.num_formats = ARRAY_SIZE(mt8173_formats),
@@ -643,6 +692,7 @@ static const struct mtk_disp_ovl_data mt8183_ovl_driver_data = {
 	.addr = DISP_REG_OVL_ADDR_MT8173,
 	.gmc_bits = 10,
 	.layer_nr = 4,
+	.fmt_convert = mtk_ovl_fmt_convert,
 	.fmt_rgb565_is_0 = true,
 	.formats = mt8173_formats,
 	.num_formats = ARRAY_SIZE(mt8173_formats),
@@ -652,6 +702,7 @@ static const struct mtk_disp_ovl_data mt8183_ovl_2l_driver_data = {
 	.addr = DISP_REG_OVL_ADDR_MT8173,
 	.gmc_bits = 10,
 	.layer_nr = 2,
+	.fmt_convert = mtk_ovl_fmt_convert,
 	.fmt_rgb565_is_0 = true,
 	.formats = mt8173_formats,
 	.num_formats = ARRAY_SIZE(mt8173_formats),
@@ -661,6 +712,7 @@ static const struct mtk_disp_ovl_data mt8192_ovl_driver_data = {
 	.addr = DISP_REG_OVL_ADDR_MT8173,
 	.gmc_bits = 10,
 	.layer_nr = 4,
+	.fmt_convert = mtk_ovl_fmt_convert_with_blend,
 	.fmt_rgb565_is_0 = true,
 	.smi_id_en = true,
 	.formats = mt8173_formats,
@@ -671,6 +723,7 @@ static const struct mtk_disp_ovl_data mt8192_ovl_2l_driver_data = {
 	.addr = DISP_REG_OVL_ADDR_MT8173,
 	.gmc_bits = 10,
 	.layer_nr = 2,
+	.fmt_convert = mtk_ovl_fmt_convert_with_blend,
 	.fmt_rgb565_is_0 = true,
 	.smi_id_en = true,
 	.formats = mt8173_formats,
@@ -681,6 +734,7 @@ static const struct mtk_disp_ovl_data mt8195_ovl_driver_data = {
 	.addr = DISP_REG_OVL_ADDR_MT8173,
 	.gmc_bits = 10,
 	.layer_nr = 4,
+	.fmt_convert = mtk_ovl_fmt_convert_with_blend,
 	.fmt_rgb565_is_0 = true,
 	.smi_id_en = true,
 	.supports_afbc = true,
-- 
2.43.0