drm/mediatek: gamma: Support multi-bank gamma LUT

Newer Gamma IP have got multiple LUT banks: support specifying the
size of the LUT banks and handle bank-switching before programming
the LUT in mtk_gamma_set_common() in preparation for adding support
for MT8195 and newer SoCs.
Suggested-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
[Angelo: Refactored original commit]
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>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20231012095736.100784-10-angelogioacchino.delregno@collabora.com/Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_disp_aal.c

@@ -17,10 +17,17 @@
 
 #define DISP_AAL_EN				0x0000
 #define AAL_EN						BIT(0)
+#define DISP_AAL_CFG				0x0020
+#define AAL_GAMMA_LUT_EN				BIT(1)
 #define DISP_AAL_SIZE				0x0030
 #define DISP_AAL_SIZE_HSIZE				GENMASK(28, 16)
 #define DISP_AAL_SIZE_VSIZE				GENMASK(12, 0)
 #define DISP_AAL_OUTPUT_SIZE			0x04d8
+#define DISP_AAL_GAMMA_LUT			0x0700
+#define DISP_AAL_GAMMA_LUT_R				GENMASK(29, 20)
+#define DISP_AAL_GAMMA_LUT_G				GENMASK(19, 10)
+#define DISP_AAL_GAMMA_LUT_B				GENMASK(9, 0)
+#define DISP_AAL_LUT_BITS			10
 #define DISP_AAL_LUT_SIZE			512
 
 struct mtk_disp_aal_data {
@@ -80,9 +87,39 @@ unsigned int mtk_aal_gamma_get_lut_size(struct device *dev)
 void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state)
 {
 	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
+	struct drm_color_lut *lut;
+	unsigned int i;
+	u32 cfg_val;
+
+	/* If gamma is not supported in AAL, go out immediately */
+	if (!(aal->data && aal->data->has_gamma))
+		return;
+
+	/* Also, if there's no gamma lut there's nothing to do here. */
+	if (!state->gamma_lut)
+		return;
+
+	lut = (struct drm_color_lut *)state->gamma_lut->data;
+	for (i = 0; i < DISP_AAL_LUT_SIZE; i++) {
+		struct drm_color_lut hwlut = {
+			.red = drm_color_lut_extract(lut[i].red, DISP_AAL_LUT_BITS),
+			.green = drm_color_lut_extract(lut[i].green, DISP_AAL_LUT_BITS),
+			.blue = drm_color_lut_extract(lut[i].blue, DISP_AAL_LUT_BITS)
+		};
+		u32 word;
+
+		word = FIELD_PREP(DISP_AAL_GAMMA_LUT_R, hwlut.red);
+		word |= FIELD_PREP(DISP_AAL_GAMMA_LUT_G, hwlut.green);
+		word |= FIELD_PREP(DISP_AAL_GAMMA_LUT_B, hwlut.blue);
+		writel(word, aal->regs + DISP_AAL_GAMMA_LUT + i * 4);
+	}
 
-	if (aal->data && aal->data->has_gamma)
-		mtk_gamma_set_common(NULL, aal->regs, state);
+	cfg_val = readl(aal->regs + DISP_AAL_CFG);
+
+	/* Enable the gamma table */
+	cfg_val |= FIELD_PREP(AAL_GAMMA_LUT_EN, 1);
+
+	writel(cfg_val, aal->regs + DISP_AAL_CFG);
 }
 
 void mtk_aal_start(struct device *dev)

drivers/gpu/drm/mediatek/mtk_disp_drv.h

@@ -58,7 +58,6 @@ void mtk_gamma_config(struct device *dev, unsigned int w,
 		      unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
 unsigned int mtk_gamma_get_lut_size(struct device *dev);
 void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state);
-void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crtc_state *state);
 void mtk_gamma_start(struct device *dev);
 void mtk_gamma_stop(struct device *dev);
 

drivers/gpu/drm/mediatek/mtk_disp_gamma.c

@@ -24,6 +24,8 @@
 #define DISP_GAMMA_SIZE				0x0030
 #define DISP_GAMMA_SIZE_HSIZE				GENMASK(28, 16)
 #define DISP_GAMMA_SIZE_VSIZE				GENMASK(12, 0)
+#define DISP_GAMMA_BANK				0x0100
+#define DISP_GAMMA_BANK_BANK				GENMASK(1, 0)
 #define DISP_GAMMA_LUT				0x0700
 
 #define DISP_GAMMA_LUT_10BIT_R			GENMASK(29, 20)
@@ -33,6 +35,7 @@
 struct mtk_disp_gamma_data {
 	bool has_dither;
 	bool lut_diff;
+	u16 lut_bank_size;
 	u16 lut_size;
 };
 
@@ -75,40 +78,53 @@ void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state)
 	unsigned int i;
 	struct drm_color_lut *lut;
 	void __iomem *lut_base;
-	u32 cfg_val, word;
+	u32 cfg_val, lbank_val, word;
+	int cur_bank, num_lut_banks;
 
 	/* If there's no gamma lut there's nothing to do here. */
 	if (!state->gamma_lut)
 		return;
 
+	num_lut_banks = gamma->data->lut_size / gamma->data->lut_bank_size;
 	lut_base = gamma->regs + DISP_GAMMA_LUT;
 	lut = (struct drm_color_lut *)state->gamma_lut->data;
-	for (i = 0; i < gamma->data->lut_size; i++) {
-		struct drm_color_lut diff, hwlut;
-
-		hwlut.red = drm_color_lut_extract(lut[i].red, 10);
-		hwlut.green = drm_color_lut_extract(lut[i].green, 10);
-		hwlut.blue = drm_color_lut_extract(lut[i].blue, 10);
-
-		if (!gamma->data->lut_diff || (i % 2 == 0)) {
-			word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, hwlut.red);
-			word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, hwlut.green);
-			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, 10);
-
-			diff.green = lut[i].green - lut[i - 1].green;
-			diff.green = drm_color_lut_extract(diff.green, 10);
-
-			diff.blue = lut[i].blue - lut[i - 1].blue;
-			diff.blue = drm_color_lut_extract(diff.blue, 10);
-
-			word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, diff.red);
-			word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, diff.green);
-			word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B, diff.blue);
+
+	for (cur_bank = 0; cur_bank < num_lut_banks; cur_bank++) {
+
+		/* Switch gamma bank and set data mode before writing LUT */
+		if (num_lut_banks > 1) {
+			lbank_val = FIELD_PREP(DISP_GAMMA_BANK_BANK, cur_bank);
+			writel(lbank_val, gamma->regs + DISP_GAMMA_BANK);
+		}
+
+		for (i = 0; i < gamma->data->lut_bank_size; i++) {
+			int n = cur_bank * gamma->data->lut_bank_size + i;
+			struct drm_color_lut diff, hwlut;
+
+			hwlut.red = drm_color_lut_extract(lut[n].red, 10);
+			hwlut.green = drm_color_lut_extract(lut[n].green, 10);
+			hwlut.blue = drm_color_lut_extract(lut[n].blue, 10);
+
+			if (!gamma->data->lut_diff || (i % 2 == 0)) {
+				word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, hwlut.red);
+				word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, hwlut.green);
+				word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B, hwlut.blue);
+			} else {
+				diff.red = lut[n].red - lut[n - 1].red;
+				diff.red = drm_color_lut_extract(diff.red, 10);
+
+				diff.green = lut[n].green - lut[n - 1].green;
+				diff.green = drm_color_lut_extract(diff.green, 10);
+
+				diff.blue = lut[n].blue - lut[n - 1].blue;
+				diff.blue = drm_color_lut_extract(diff.blue, 10);
+
+				word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, diff.red);
+				word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, diff.green);
+				word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B, diff.blue);
+			}
+			writel(word, lut_base + i * 4);
 		}
-		writel(word, lut_base + i * 4);
 	}
 
 	cfg_val = readl(gamma->regs + DISP_GAMMA_CFG);
@@ -212,10 +228,12 @@ static void mtk_disp_gamma_remove(struct platform_device *pdev)
 
 static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = {
 	.has_dither = true,
+	.lut_bank_size = 512,
 	.lut_size = 512,
 };
 
 static const struct mtk_disp_gamma_data mt8183_gamma_driver_data = {
+	.lut_bank_size = 512,
 	.lut_diff = true,
 	.lut_size = 512,
 };