diff mbox series

[v3,07/11] drm/mediatek: gamma: Support specifying number of bits per LUT component

Message ID 20230506123549.101727-8-angelogioacchino.delregno@collabora.com (mailing list archive)
State New, archived
Headers show
Series MediaTek DDP GAMMA - 12-bit LUT support | expand

Commit Message

AngeloGioacchino Del Regno May 6, 2023, 12:35 p.m. UTC 
New SoCs, like MT8195, not only may support bigger lookup tables, but
have got a different register layout to support bigger precision:
support specifying the number of `lut_bits` for each SoC and use it
in mtk_gamma_set_common() to perform the right calculation.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

Comments

Jason-JH Lin (林睿祥) May 9, 2023, 2:41 p.m. UTC | #1 
Hi Angelo,

On Sat, 2023-05-06 at 14:35 +0200, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> New SoCs, like MT8195, not only may support bigger lookup tables, but
> have got a different register layout to support bigger precision:
> support specifying the number of `lut_bits` for each SoC and use it
> in mtk_gamma_set_common() to perform the right calculation.
> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>

Reviewed-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>

Regards,
Jason-JH.Lin
diff mbox series

Patch

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
index ed2aa1fb0171..62e1e50d2671 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
@@ -39,6 +39,7 @@  struct mtk_disp_gamma_data {
 	bool has_dither;
 	bool lut_diff;
 	u16 lut_size;
+	u8 lut_bits;
 };
 
 /*
@@ -84,6 +85,7 @@  void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
 	void __iomem *lut_base;
 	bool lut_diff;
 	u16 lut_size;
+	u8 lut_bits;
 	u32 cfg_val, word;
 
 	/* If there's no gamma lut there's nothing to do here. */
@@ -92,9 +94,11 @@  void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
 
 	if (gamma && gamma->data) {
 		lut_diff = gamma->data->lut_diff;
+		lut_bits = gamma->data->lut_bits;
 		lut_size = gamma->data->lut_size;
 	} else {
 		lut_diff = false;
+		lut_bits = LUT_BITS_DEFAULT;
 		lut_size = LUT_SIZE_DEFAULT;
 	}
 
@@ -104,9 +108,9 @@  void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
 	for (i = 0; i < lut_size; i++) {
 		struct drm_color_lut diff, hwlut;
 
-		hwlut.red = drm_color_lut_extract(lut[i].red, LUT_BITS_DEFAULT);
-		hwlut.green = drm_color_lut_extract(lut[i].green, LUT_BITS_DEFAULT);
-		hwlut.blue = drm_color_lut_extract(lut[i].blue, LUT_BITS_DEFAULT);
+		hwlut.red = drm_color_lut_extract(lut[i].red, lut_bits);
+		hwlut.green = drm_color_lut_extract(lut[i].green, lut_bits);
+		hwlut.blue = drm_color_lut_extract(lut[i].blue, lut_bits);
 
 		if (!lut_diff || (i % 2 == 0)) {
 			word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, hwlut.red);
@@ -114,13 +118,13 @@  void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
 			word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B, hwlut.blue);
 		} else {
 			diff.red = lut[i].red - lut[i - 1].red;
-			diff.red = drm_color_lut_extract(diff.red, LUT_BITS_DEFAULT);
+			diff.red = drm_color_lut_extract(diff.red, lut_bits);
 
 			diff.green = lut[i].green - lut[i - 1].green;
-			diff.green = drm_color_lut_extract(diff.green, LUT_BITS_DEFAULT);
+			diff.green = drm_color_lut_extract(diff.green, lut_bits);
 
 			diff.blue = lut[i].blue - lut[i - 1].blue;
-			diff.blue = drm_color_lut_extract(diff.blue, LUT_BITS_DEFAULT);
+			diff.blue = drm_color_lut_extract(diff.blue, lut_bits);
 
 			word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, diff.red);
 			word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, diff.green);
@@ -237,10 +241,12 @@  static int mtk_disp_gamma_remove(struct platform_device *pdev)
 
 static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = {
 	.has_dither = true,
+	.lut_bits = 10,
 	.lut_size = 512,
 };
 
 static const struct mtk_disp_gamma_data mt8183_gamma_driver_data = {
+	.lut_bits = 10,
 	.lut_diff = true,
 	.lut_size = 512,
 };