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Subject[PATCH v12 02/14] drm/mediatek: dpi: Add support for quantization range
Date
For RGB colorimetry, CTA-861 support both limited and full range data
when receiving video with RGB color space.
We use drm_default_rgb_quant_range() to determine the correct setting.

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
---
drivers/gpu/drm/mediatek/mtk_dpi.c | 34 ++++++++++++++++++------------
1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index e61cd67b978f..21ad5623b568 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -235,16 +235,30 @@ static void mtk_dpi_config_fb_size(struct mtk_dpi *dpi, u32 width, u32 height)
mtk_dpi_mask(dpi, DPI_SIZE, height << VSIZE, VSIZE_MASK);
}

-static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi,
- struct mtk_dpi_yc_limit *limit)
+static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi)
{
- mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_bottom << Y_LIMINT_BOT,
+ struct mtk_dpi_yc_limit limit;
+
+ if (drm_default_rgb_quant_range(&dpi->mode) ==
+ HDMI_QUANTIZATION_RANGE_LIMITED) {
+ limit.y_bottom = 0x10;
+ limit.y_top = 0xfe0;
+ limit.c_bottom = 0x10;
+ limit.c_top = 0xfe0;
+ } else {
+ limit.y_bottom = 0;
+ limit.y_top = 0xfff;
+ limit.c_bottom = 0;
+ limit.c_top = 0xfff;
+ }
+
+ mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit.y_bottom << Y_LIMINT_BOT,
Y_LIMINT_BOT_MASK);
- mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_top << Y_LIMINT_TOP,
+ mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit.y_top << Y_LIMINT_TOP,
Y_LIMINT_TOP_MASK);
- mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_bottom << C_LIMIT_BOT,
+ mtk_dpi_mask(dpi, DPI_C_LIMIT, limit.c_bottom << C_LIMIT_BOT,
C_LIMIT_BOT_MASK);
- mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_top << C_LIMIT_TOP,
+ mtk_dpi_mask(dpi, DPI_C_LIMIT, limit.c_top << C_LIMIT_TOP,
C_LIMIT_TOP_MASK);
}

@@ -449,7 +463,6 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
struct drm_display_mode *mode)
{
- struct mtk_dpi_yc_limit limit;
struct mtk_dpi_polarities dpi_pol;
struct mtk_dpi_sync_param hsync;
struct mtk_dpi_sync_param vsync_lodd = { 0 };
@@ -484,11 +497,6 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
dev_dbg(dpi->dev, "Got PLL %lu Hz, pixel clock %lu Hz\n",
pll_rate, vm.pixelclock);

- limit.c_bottom = 0x0010;
- limit.c_top = 0x0FE0;
- limit.y_bottom = 0x0010;
- limit.y_top = 0x0FE0;
-
dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
dpi_pol.hsync_pol = vm.flags & DISPLAY_FLAGS_HSYNC_HIGH ?
@@ -536,7 +544,7 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
else
mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive);

- mtk_dpi_config_channel_limit(dpi, &limit);
+ mtk_dpi_config_channel_limit(dpi);
mtk_dpi_config_bit_num(dpi, dpi->bit_num);
mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
mtk_dpi_config_yc_map(dpi, dpi->yc_map);
--
2.18.0
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