[PATCH v2 4/4] drm: lcdif: Add support for YUV planes
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Wed Sep 28 00:58:12 UTC 2022
From: Kieran Bingham <kieran.bingham at ideasonboard.com>
The LCDIF includes a color space converter that supports YUV input. Use
it to support YUV planes, either through the converter if the output
format is RGB, or in conversion bypass mode otherwise.
Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
Changes since v1:
- Support all YCbCr encodings and quantization ranges
- Drop incorrect comment
---
drivers/gpu/drm/mxsfb/lcdif_kms.c | 183 +++++++++++++++++++++++++----
drivers/gpu/drm/mxsfb/lcdif_regs.h | 5 +-
2 files changed, 164 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index c3622be0c587..b469a90fd50f 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_framebuffer.h>
@@ -32,13 +33,77 @@
/* -----------------------------------------------------------------------------
* CRTC
*/
+
+/*
+ * Despite the reference manual stating the opposite, the D1, D2 and D3 offset
+ * values are added to Y, U and V, 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] = {
+ CSC0_COEF0_A1(0x012a) | CSC0_COEF0_A2(0x0000),
+ CSC0_COEF1_A3(0x01a2) | CSC0_COEF1_B1(0x0123),
+ CSC0_COEF2_B2(0x079c) | CSC0_COEF2_B3(0x0730),
+ CSC0_COEF3_C1(0x0124) | CSC0_COEF3_C2(0x0204),
+ CSC0_COEF4_C3(0x0000) | CSC0_COEF4_D1(0x01f0),
+ CSC0_COEF5_D2(0x0180) | CSC0_COEF5_D3(0x0180),
+ },
+ [DRM_COLOR_YCBCR_FULL_RANGE] = {
+ CSC0_COEF0_A1(0x0100) | CSC0_COEF0_A2(0x0000),
+ CSC0_COEF1_A3(0x0167) | CSC0_COEF1_B1(0x0100),
+ CSC0_COEF2_B2(0x07a8) | CSC0_COEF2_B3(0x0749),
+ CSC0_COEF3_C1(0x0100) | CSC0_COEF3_C2(0x01c6),
+ CSC0_COEF4_C3(0x0000) | CSC0_COEF4_D1(0x0000),
+ CSC0_COEF5_D2(0x0180) | CSC0_COEF5_D3(0x0180),
+ },
+ },
+ [DRM_COLOR_YCBCR_BT709] = {
+ [DRM_COLOR_YCBCR_LIMITED_RANGE] = {
+ CSC0_COEF0_A1(0x012a) | CSC0_COEF0_A2(0x0000),
+ CSC0_COEF1_A3(0x01d6) | CSC0_COEF1_B1(0x0123),
+ CSC0_COEF2_B2(0x07c9) | CSC0_COEF2_B3(0x0778),
+ CSC0_COEF3_C1(0x0123) | CSC0_COEF3_C2(0x021d),
+ CSC0_COEF4_C3(0x0000) | CSC0_COEF4_D1(0x01f0),
+ CSC0_COEF5_D2(0x0180) | CSC0_COEF5_D3(0x0180),
+ },
+ [DRM_COLOR_YCBCR_FULL_RANGE] = {
+ CSC0_COEF0_A1(0x0100) | CSC0_COEF0_A2(0x0000),
+ CSC0_COEF1_A3(0x0193) | CSC0_COEF1_B1(0x0100),
+ CSC0_COEF2_B2(0x07d0) | CSC0_COEF2_B3(0x0788),
+ CSC0_COEF3_C1(0x0100) | CSC0_COEF3_C2(0x01db),
+ CSC0_COEF4_C3(0x0000) | CSC0_COEF4_D1(0x0000),
+ CSC0_COEF5_D2(0x0180) | CSC0_COEF5_D3(0x0180),
+ },
+ },
+ [DRM_COLOR_YCBCR_BT2020] = {
+ [DRM_COLOR_YCBCR_LIMITED_RANGE] = {
+ CSC0_COEF0_A1(0x012a) | CSC0_COEF0_A2(0x0000),
+ CSC0_COEF1_A3(0x01b8) | CSC0_COEF1_B1(0x0123),
+ CSC0_COEF2_B2(0x07d0) | CSC0_COEF2_B3(0x075a),
+ CSC0_COEF3_C1(0x0124) | CSC0_COEF3_C2(0x0224),
+ CSC0_COEF4_C3(0x0000) | CSC0_COEF4_D1(0x01f0),
+ CSC0_COEF5_D2(0x0180) | CSC0_COEF5_D3(0x0180),
+ },
+ [DRM_COLOR_YCBCR_FULL_RANGE] = {
+ CSC0_COEF0_A1(0x0100) | CSC0_COEF0_A2(0x0000),
+ CSC0_COEF1_A3(0x0179) | CSC0_COEF1_B1(0x0100),
+ CSC0_COEF2_B2(0x07d6) | CSC0_COEF2_B3(0x076e),
+ CSC0_COEF3_C1(0x0100) | CSC0_COEF3_C2(0x01e2),
+ CSC0_COEF4_C3(0x0000) | CSC0_COEF4_D1(0x0000),
+ CSC0_COEF5_D2(0x0180) | CSC0_COEF5_D3(0x0180),
+ },
+ },
+};
+
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:
@@ -52,24 +117,7 @@ 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. */
- 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);
@@ -77,6 +125,7 @@ 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);
@@ -101,10 +150,78 @@ static void lcdif_set_formats(struct lcdif_drm_private *lcdif,
writel(CTRLDESCL0_5_BPP_32_ARGB8888,
lcdif->base + LCDC_V8_CTRLDESCL0_5);
break;
+
+ /* YUYV 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. */
+ 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)
@@ -201,6 +318,7 @@ 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)
{
@@ -223,7 +341,7 @@ 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);
}
@@ -306,7 +424,7 @@ 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_cma_get_gem_addr(new_pstate->fb, new_pstate, 0);
@@ -456,6 +574,12 @@ static const u32 lcdif_primary_plane_formats[] = {
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[] = {
@@ -469,6 +593,11 @@ 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;
@@ -484,6 +613,14 @@ 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 0d5d9bedd94a..fb74eb5ccbf1 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_regs.h
+++ b/drivers/gpu/drm/mxsfb/lcdif_regs.h
@@ -216,7 +216,10 @@
#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)
--
Regards,
Laurent Pinchart
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