diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index 9f212e29059b3..33ee40876994a 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -15,6 +15,7 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
+#include <drm/drm_color_mgmt.h>
#include <drm/drm_crtc.h>
#include <drm/drm_encoder.h>
#include <drm/drm_fb_dma_helper.h>
@@ -31,13 +32,126 @@
/* -----------------------------------------------------------------------------
* CRTC
*/
+
+/*
+ * For conversion from YCbCr to RGB, the CSC operates as follows:
+ *
+ * |R| |A1 A2 A3| |Y + D1|
+ * |G| = |B1 B2 B3| * |Cb + D2|
+ * |B| |C1 C2 C3| |Cr + D3|
+ *
+ * The A, B and C coefficients are expressed as Q2.8 fixed point values, and
+ * the D coefficients as Q0.8. Despite the reference manual stating the
+ * opposite, the D1, D2 and D3 offset values are added to Y, Cb and Cr, not
+ * subtracted. They must thus be programmed with negative values.
+ */
+static const u32 lcdif_yuv2rgb_coeffs[3][2][6] = {
+ [DRM_COLOR_YCBCR_BT601] = {
+ [DRM_COLOR_YCBCR_LIMITED_RANGE] = {
+ /*
+ * BT.601 limited range:
+ *
+ * |R| |1.1644 0.0000 1.5960| |Y - 16 |
+ * |G| = |1.1644 -0.3917 -0.8129| * |Cb - 128|
+ * |B| |1.1644 2.0172 0.0000| |Cr - 128|
+ */
+ CSC0_COEF0_A1(0x12a) | CSC0_COEF0_A2(0x000),
+ CSC0_COEF1_A3(0x199) | CSC0_COEF1_B1(0x12a),
+ CSC0_COEF2_B2(0x79c) | CSC0_COEF2_B3(0x730),
+ CSC0_COEF3_C1(0x12a) | CSC0_COEF3_C2(0x204),
+ CSC0_COEF4_C3(0x000) | CSC0_COEF4_D1(0x1f0),
+ CSC0_COEF5_D2(0x180) | CSC0_COEF5_D3(0x180),
+ },
+ [DRM_COLOR_YCBCR_FULL_RANGE] = {
+ /*
+ * BT.601 full range:
+ *
+ * |R| |1.0000 0.0000 1.4020| |Y - 0 |
+ * |G| = |1.0000 -0.3441 -0.7141| * |Cb - 128|
+ * |B| |1.0000 1.7720 0.0000| |Cr - 128|
+ */
+ CSC0_COEF0_A1(0x100) | CSC0_COEF0_A2(0x000),
+ CSC0_COEF1_A3(0x167) | CSC0_COEF1_B1(0x100),
+ CSC0_COEF2_B2(0x7a8) | CSC0_COEF2_B3(0x749),
+ CSC0_COEF3_C1(0x100) | CSC0_COEF3_C2(0x1c6),
+ CSC0_COEF4_C3(0x000) | CSC0_COEF4_D1(0x000),
+ CSC0_COEF5_D2(0x180) | CSC0_COEF5_D3(0x180),
+ },
+ },
+ [DRM_COLOR_YCBCR_BT709] = {
+ [DRM_COLOR_YCBCR_LIMITED_RANGE] = {
+ /*
+ * Rec.709 limited range:
+ *
+ * |R| |1.1644 0.0000 1.7927| |Y - 16 |
+ * |G| = |1.1644 -0.2132 -0.5329| * |Cb - 128|
+ * |B| |1.1644 2.1124 0.0000| |Cr - 128|
+ */
+ CSC0_COEF0_A1(0x12a) | CSC0_COEF0_A2(0x000),
+ CSC0_COEF1_A3(0x1cb) | CSC0_COEF1_B1(0x12a),
+ CSC0_COEF2_B2(0x7c9) | CSC0_COEF2_B3(0x778),
+ CSC0_COEF3_C1(0x12a) | CSC0_COEF3_C2(0x21d),
+ CSC0_COEF4_C3(0x000) | CSC0_COEF4_D1(0x1f0),
+ CSC0_COEF5_D2(0x180) | CSC0_COEF5_D3(0x180),
+ },
+ [DRM_COLOR_YCBCR_FULL_RANGE] = {
+ /*
+ * Rec.709 full range:
+ *
+ * |R| |1.0000 0.0000 1.5748| |Y - 0 |
+ * |G| = |1.0000 -0.1873 -0.4681| * |Cb - 128|
+ * |B| |1.0000 1.8556 0.0000| |Cr - 128|
+ */
+ CSC0_COEF0_A1(0x100) | CSC0_COEF0_A2(0x000),
+ CSC0_COEF1_A3(0x193) | CSC0_COEF1_B1(0x100),
+ CSC0_COEF2_B2(0x7d0) | CSC0_COEF2_B3(0x788),
+ CSC0_COEF3_C1(0x100) | CSC0_COEF3_C2(0x1db),
+ CSC0_COEF4_C3(0x000) | CSC0_COEF4_D1(0x000),
+ CSC0_COEF5_D2(0x180) | CSC0_COEF5_D3(0x180),
+ },
+ },
+ [DRM_COLOR_YCBCR_BT2020] = {
+ [DRM_COLOR_YCBCR_LIMITED_RANGE] = {
+ /*
+ * BT.2020 limited range:
+ *
+ * |R| |1.1644 0.0000 1.6787| |Y - 16 |
+ * |G| = |1.1644 -0.1874 -0.6505| * |Cb - 128|
+ * |B| |1.1644 2.1418 0.0000| |Cr - 128|
+ */
+ CSC0_COEF0_A1(0x12a) | CSC0_COEF0_A2(0x000),
+ CSC0_COEF1_A3(0x1ae) | CSC0_COEF1_B1(0x12a),
+ CSC0_COEF2_B2(0x7d0) | CSC0_COEF2_B3(0x759),
+ CSC0_COEF3_C1(0x12a) | CSC0_COEF3_C2(0x224),
+ CSC0_COEF4_C3(0x000) | CSC0_COEF4_D1(0x1f0),
+ CSC0_COEF5_D2(0x180) | CSC0_COEF5_D3(0x180),
+ },
+ [DRM_COLOR_YCBCR_FULL_RANGE] = {
+ /*
+ * BT.2020 full range:
+ *
+ * |R| |1.0000 0.0000 1.4746| |Y - 0 |
+ * |G| = |1.0000 -0.1646 -0.5714| * |Cb - 128|
+ * |B| |1.0000 1.8814 0.0000| |Cr - 128|
+ */
+ CSC0_COEF0_A1(0x100) | CSC0_COEF0_A2(0x000),
+ CSC0_COEF1_A3(0x179) | CSC0_COEF1_B1(0x100),
+ CSC0_COEF2_B2(0x7d6) | CSC0_COEF2_B3(0x76e),
+ CSC0_COEF3_C1(0x100) | CSC0_COEF3_C2(0x1e2),
+ CSC0_COEF4_C3(0x000) | CSC0_COEF4_D1(0x000),
+ CSC0_COEF5_D2(0x180) | CSC0_COEF5_D3(0x180),
+ },
+ },
+};
+
static void lcdif_set_formats(struct lcdif_drm_private *lcdif,
+ struct drm_plane_state *plane_state,
const u32 bus_format)
{
struct drm_device *drm = lcdif->drm;
- const u32 format = lcdif->crtc.primary->state->fb->format->format;
-
- writel(CSC0_CTRL_BYPASS, lcdif->base + LCDC_V8_CSC0_CTRL);
+ const u32 format = plane_state->fb->format->format;
+ bool in_yuv = false;
+ bool out_yuv = false;
switch (bus_format) {
case MEDIA_BUS_FMT_RGB565_1X16:
@@ -51,30 +165,7 @@ static void lcdif_set_formats(struct lcdif_drm_private *lcdif,
case MEDIA_BUS_FMT_UYVY8_1X16:
writel(DISP_PARA_LINE_PATTERN_UYVY_H,
lcdif->base + LCDC_V8_DISP_PARA);
-
- /*
- * CSC: BT.601 Limited Range RGB to YCbCr coefficients.
- *
- * |Y | | 0.2568 0.5041 0.0979| |R| |16 |
- * |Cb| = |-0.1482 -0.2910 0.4392| * |G| + |128|
- * |Cr| | 0.4392 0.4392 -0.3678| |B| |128|
- */
- writel(CSC0_COEF0_A2(0x081) | CSC0_COEF0_A1(0x041),
- lcdif->base + LCDC_V8_CSC0_COEF0);
- writel(CSC0_COEF1_B1(0x7db) | CSC0_COEF1_A3(0x019),
- lcdif->base + LCDC_V8_CSC0_COEF1);
- writel(CSC0_COEF2_B3(0x070) | CSC0_COEF2_B2(0x7b6),
- lcdif->base + LCDC_V8_CSC0_COEF2);
- writel(CSC0_COEF3_C2(0x7a2) | CSC0_COEF3_C1(0x070),
- lcdif->base + LCDC_V8_CSC0_COEF3);
- writel(CSC0_COEF4_D1(0x010) | CSC0_COEF4_C3(0x7ee),
- lcdif->base + LCDC_V8_CSC0_COEF4);
- writel(CSC0_COEF5_D3(0x080) | CSC0_COEF5_D2(0x080),
- lcdif->base + LCDC_V8_CSC0_COEF5);
-
- writel(CSC0_CTRL_CSC_MODE_RGB2YCbCr,
- lcdif->base + LCDC_V8_CSC0_CTRL);
-
+ out_yuv = true;
break;
default:
dev_err(drm->dev, "Unknown media bus format 0x%x\n", bus_format);
@@ -82,6 +173,7 @@ static void lcdif_set_formats(struct lcdif_drm_private *lcdif,
}
switch (format) {
+ /* RGB Formats */
case DRM_FORMAT_RGB565:
writel(CTRLDESCL0_5_BPP_16_RGB565,
lcdif->base + LCDC_V8_CTRLDESCL0_5);
@@ -106,10 +198,84 @@ static void lcdif_set_formats(struct lcdif_drm_private *lcdif,
writel(CTRLDESCL0_5_BPP_32_ARGB8888,
lcdif->base + LCDC_V8_CTRLDESCL0_5);
break;
+
+ /* YUV Formats */
+ case DRM_FORMAT_YUYV:
+ writel(CTRLDESCL0_5_BPP_YCbCr422 | CTRLDESCL0_5_YUV_FORMAT_VY2UY1,
+ lcdif->base + LCDC_V8_CTRLDESCL0_5);
+ in_yuv = true;
+ break;
+ case DRM_FORMAT_YVYU:
+ writel(CTRLDESCL0_5_BPP_YCbCr422 | CTRLDESCL0_5_YUV_FORMAT_UY2VY1,
+ lcdif->base + LCDC_V8_CTRLDESCL0_5);
+ in_yuv = true;
+ break;
+ case DRM_FORMAT_UYVY:
+ writel(CTRLDESCL0_5_BPP_YCbCr422 | CTRLDESCL0_5_YUV_FORMAT_Y2VY1U,
+ lcdif->base + LCDC_V8_CTRLDESCL0_5);
+ in_yuv = true;
+ break;
+ case DRM_FORMAT_VYUY:
+ writel(CTRLDESCL0_5_BPP_YCbCr422 | CTRLDESCL0_5_YUV_FORMAT_Y2UY1V,
+ lcdif->base + LCDC_V8_CTRLDESCL0_5);
+ in_yuv = true;
+ break;
+
default:
dev_err(drm->dev, "Unknown pixel format 0x%x\n", format);
break;
}
+
+ /*
+ * The CSC differentiates between "YCbCr" and "YUV", but the reference
+ * manual doesn't detail how they differ. Experiments showed that the
+ * luminance value is unaffected, only the calculations involving chroma
+ * values differ. The YCbCr mode behaves as expected, with chroma values
+ * being offset by 128. The YUV mode isn't fully understood.
+ */
+ if (!in_yuv && out_yuv) {
+ /* RGB -> YCbCr */
+ writel(CSC0_CTRL_CSC_MODE_RGB2YCbCr,
+ lcdif->base + LCDC_V8_CSC0_CTRL);
+
+ /*
+ * CSC: BT.601 Limited Range RGB to YCbCr coefficients.
+ *
+ * |Y | | 0.2568 0.5041 0.0979| |R| |16 |
+ * |Cb| = |-0.1482 -0.2910 0.4392| * |G| + |128|
+ * |Cr| | 0.4392 0.4392 -0.3678| |B| |128|
+ */
+ writel(CSC0_COEF0_A2(0x081) | CSC0_COEF0_A1(0x041),
+ lcdif->base + LCDC_V8_CSC0_COEF0);
+ writel(CSC0_COEF1_B1(0x7db) | CSC0_COEF1_A3(0x019),
+ lcdif->base + LCDC_V8_CSC0_COEF1);
+ writel(CSC0_COEF2_B3(0x070) | CSC0_COEF2_B2(0x7b6),
+ lcdif->base + LCDC_V8_CSC0_COEF2);
+ writel(CSC0_COEF3_C2(0x7a2) | CSC0_COEF3_C1(0x070),
+ lcdif->base + LCDC_V8_CSC0_COEF3);
+ writel(CSC0_COEF4_D1(0x010) | CSC0_COEF4_C3(0x7ee),
+ lcdif->base + LCDC_V8_CSC0_COEF4);
+ writel(CSC0_COEF5_D3(0x080) | CSC0_COEF5_D2(0x080),
+ lcdif->base + LCDC_V8_CSC0_COEF5);
+ } else if (in_yuv && !out_yuv) {
+ /* YCbCr -> RGB */
+ const u32 *coeffs =
+ lcdif_yuv2rgb_coeffs[plane_state->color_encoding]
+ [plane_state->color_range];
+
+ writel(CSC0_CTRL_CSC_MODE_YCbCr2RGB,
+ lcdif->base + LCDC_V8_CSC0_CTRL);
+
+ writel(coeffs[0], lcdif->base + LCDC_V8_CSC0_COEF0);
+ writel(coeffs[1], lcdif->base + LCDC_V8_CSC0_COEF1);
+ writel(coeffs[2], lcdif->base + LCDC_V8_CSC0_COEF2);
+ writel(coeffs[3], lcdif->base + LCDC_V8_CSC0_COEF3);
+ writel(coeffs[4], lcdif->base + LCDC_V8_CSC0_COEF4);
+ writel(coeffs[5], lcdif->base + LCDC_V8_CSC0_COEF5);
+ } else {
+ /* RGB -> RGB, YCbCr -> YCbCr: bypass colorspace converter. */
+ writel(CSC0_CTRL_BYPASS, lcdif->base + LCDC_V8_CSC0_CTRL);
+ }
}
static void lcdif_set_mode(struct lcdif_drm_private *lcdif, u32 bus_flags)
@@ -194,6 +360,7 @@ static void lcdif_reset_block(struct lcdif_drm_private *lcdif)
}
static void lcdif_crtc_mode_set_nofb(struct lcdif_drm_private *lcdif,
+ struct drm_plane_state *plane_state,
struct drm_bridge_state *bridge_state,
const u32 bus_format)
{
@@ -216,7 +383,7 @@ static void lcdif_crtc_mode_set_nofb(struct lcdif_drm_private *lcdif,
/* Mandatory eLCDIF reset as per the Reference Manual */
lcdif_reset_block(lcdif);
- lcdif_set_formats(lcdif, bus_format);
+ lcdif_set_formats(lcdif, plane_state, bus_format);
lcdif_set_mode(lcdif, bus_flags);
}
@@ -299,7 +466,7 @@ static void lcdif_crtc_atomic_enable(struct drm_crtc *crtc,
pm_runtime_get_sync(drm->dev);
- lcdif_crtc_mode_set_nofb(lcdif, bridge_state, bus_format);
+ lcdif_crtc_mode_set_nofb(lcdif, new_pstate, bridge_state, bus_format);
/* Write cur_buf as well to avoid an initial corrupt frame */
paddr = drm_fb_dma_get_gem_addr(new_pstate->fb, new_pstate, 0);
@@ -443,12 +610,19 @@ static const struct drm_plane_funcs lcdif_plane_funcs = {
};
static const u32 lcdif_primary_plane_formats[] = {
+ /* RGB */
DRM_FORMAT_RGB565,
DRM_FORMAT_RGB888,
DRM_FORMAT_XBGR8888,
DRM_FORMAT_XRGB1555,
DRM_FORMAT_XRGB4444,
DRM_FORMAT_XRGB8888,
+
+ /* Packed YCbCr */
+ DRM_FORMAT_YUYV,
+ DRM_FORMAT_YVYU,
+ DRM_FORMAT_UYVY,
+ DRM_FORMAT_VYUY,
};
static const u64 lcdif_modifiers[] = {
@@ -462,6 +636,11 @@ static const u64 lcdif_modifiers[] = {
int lcdif_kms_init(struct lcdif_drm_private *lcdif)
{
+ const u32 supported_encodings = BIT(DRM_COLOR_YCBCR_BT601) |
+ BIT(DRM_COLOR_YCBCR_BT709) |
+ BIT(DRM_COLOR_YCBCR_BT2020);
+ const u32 supported_ranges = BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
+ BIT(DRM_COLOR_YCBCR_FULL_RANGE);
struct drm_encoder *encoder = &lcdif->encoder;
struct drm_crtc *crtc = &lcdif->crtc;
int ret;
@@ -477,6 +656,14 @@ int lcdif_kms_init(struct lcdif_drm_private *lcdif)
if (ret)
return ret;
+ ret = drm_plane_create_color_properties(&lcdif->planes.primary,
+ supported_encodings,
+ supported_ranges,
+ DRM_COLOR_YCBCR_BT601,
+ DRM_COLOR_YCBCR_LIMITED_RANGE);
+ if (ret)
+ return ret;
+
drm_crtc_helper_add(crtc, &lcdif_crtc_helper_funcs);
ret = drm_crtc_init_with_planes(lcdif->drm, crtc,
&lcdif->planes.primary, NULL,
diff --git a/drivers/gpu/drm/mxsfb/lcdif_regs.h b/drivers/gpu/drm/mxsfb/lcdif_regs.h
index 03c7827bdf5a5..2d3920b8371ee 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_regs.h
+++ b/drivers/gpu/drm/mxsfb/lcdif_regs.h
@@ -212,7 +212,10 @@
#define CTRLDESCL0_5_YUV_FORMAT_UY2VY1 (0x3 << 14)
#define CTRLDESCL0_5_YUV_FORMAT_MASK GENMASK(15, 14)
-#define CSC0_CTRL_CSC_MODE_RGB2YCbCr GENMASK(2, 1)
+#define CSC0_CTRL_CSC_MODE_YUV2RGB (0x0 << 1)
+#define CSC0_CTRL_CSC_MODE_YCbCr2RGB (0x1 << 1)
+#define CSC0_CTRL_CSC_MODE_RGB2YUV (0x2 << 1)
+#define CSC0_CTRL_CSC_MODE_RGB2YCbCr (0x3 << 1)
#define CSC0_CTRL_CSC_MODE_MASK GENMASK(2, 1)
#define CSC0_CTRL_BYPASS BIT(0)