[PATCH v12 04/14] drm/mediatek: dpi: implement a swap_input toggle in SoC config

[Bo-Chen Chen]

From: Guillaume Ranquet <granquet at baylibre.com>

The hardware design of dp_intf does not support input swap, so we add
a bit of flexibility to support SoCs without swap_input support.
We also add a warning message if the hardware is not supported and it
needs to swap input.

Signed-off-by: Guillaume Ranquet <granquet at baylibre.com>
[Bo-Chen: Add modification reason in commit message.]
Signed-off-by: Bo-Chen Chen <rex-bc.chen at mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
Reviewed-by: Rex-BC Chen <rex-bc.chen at mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index c88d64889402..5aab3029c54d 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -126,6 +126,7 @@ struct mtk_dpi_conf {
 	const u32 *output_fmts;
 	u32 num_output_fmts;
 	bool is_ck_de_pol;
+	bool swap_input_support;
 };
 
 static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
@@ -390,18 +391,24 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 	    (format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
 		mtk_dpi_config_yuv422_enable(dpi, false);
 		mtk_dpi_config_csc_enable(dpi, true);
-		mtk_dpi_config_swap_input(dpi, false);
+		if (dpi->conf->swap_input_support)
+			mtk_dpi_config_swap_input(dpi, false);
 		mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_BGR);
 	} else if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_422) ||
 		   (format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
 		mtk_dpi_config_yuv422_enable(dpi, true);
 		mtk_dpi_config_csc_enable(dpi, true);
-		mtk_dpi_config_swap_input(dpi, true);
+		if (dpi->conf->swap_input_support)
+			mtk_dpi_config_swap_input(dpi, true);
+		else
+			dev_warn(dpi->dev,
+				 "Failed to swap input, hw is not supported.\n");
 		mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 	} else {
 		mtk_dpi_config_yuv422_enable(dpi, false);
 		mtk_dpi_config_csc_enable(dpi, false);
-		mtk_dpi_config_swap_input(dpi, false);
+		if (dpi->conf->swap_input_support)
+			mtk_dpi_config_swap_input(dpi, false);
 		mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 	}
 }
@@ -813,6 +820,7 @@ static const struct mtk_dpi_conf mt8173_conf = {
 	.output_fmts = mt8173_output_fmts,
 	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
 	.is_ck_de_pol = true,
+	.swap_input_support = true,
 };
 
 static const struct mtk_dpi_conf mt2701_conf = {
@@ -823,6 +831,7 @@ static const struct mtk_dpi_conf mt2701_conf = {
 	.output_fmts = mt8173_output_fmts,
 	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
 	.is_ck_de_pol = true,
+	.swap_input_support = true,
 };
 
 static const struct mtk_dpi_conf mt8183_conf = {
@@ -832,6 +841,7 @@ static const struct mtk_dpi_conf mt8183_conf = {
 	.output_fmts = mt8183_output_fmts,
 	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
 	.is_ck_de_pol = true,
+	.swap_input_support = true,
 };
 
 static const struct mtk_dpi_conf mt8192_conf = {
@@ -841,6 +851,7 @@ static const struct mtk_dpi_conf mt8192_conf = {
 	.output_fmts = mt8183_output_fmts,
 	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
 	.is_ck_de_pol = true,
+	.swap_input_support = true,
 };
 
 static int mtk_dpi_probe(struct platform_device *pdev)
-- 
2.18.0