This patch adds encoding support for the YUV420 output from the
Amlogic Meson SoCs Video Processing Unit to the HDMI Controller.
The YUV420 is obtained by generating a YUV444 pixel stream like
the classic HDMI display modes, but then the Video Encoder output
can be configured to down-sample the YUV444 pixel stream to a YUV420
stream.
In addition if pixel stream down-sampling, the Y Cb Cr components must
also be mapped differently to align with the HDMI2.0 specifications.
Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
drivers/gpu/drm/meson/meson_dw_hdmi.c | 3 ++-
drivers/gpu/drm/meson/meson_venc.c | 6 ++++--
drivers/gpu/drm/meson/meson_venc.h | 11 +++++++++++
3 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index fb09592eba3e..2b278ee75100 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -719,7 +719,8 @@ static void meson_venc_hdmi_encoder_mode_set(struct drm_bridge *bridge,
DRM_DEBUG_DRIVER("\"%s\" vic %d\n", mode->name, vic);
/* VENC + VENC-DVI Mode setup */
- meson_venc_hdmi_mode_set(priv, vic, mode);
+ meson_venc_hdmi_mode_set(priv, vic, ycrcb_map, false,
+ MESON_VENC_MAP_CB_Y_CR);
/* VCLK Set clock */
dw_hdmi_set_vclk(dw_hdmi, mode);
diff --git a/drivers/gpu/drm/meson/meson_venc.c b/drivers/gpu/drm/meson/meson_venc.c
index c8e9840ad450..ec2723822552 100644
--- a/drivers/gpu/drm/meson/meson_venc.c
+++ b/drivers/gpu/drm/meson/meson_venc.c
@@ -946,6 +946,8 @@ bool meson_venc_hdmi_venc_repeat(int vic)
EXPORT_SYMBOL_GPL(meson_venc_hdmi_venc_repeat);
void meson_venc_hdmi_mode_set(struct meson_drm *priv, int vic,
+ unsigned int ycrcb_map,
+ bool yuv420_mode,
const struct drm_display_mode *mode)
{
union meson_hdmi_venc_mode *vmode = NULL;
@@ -1496,8 +1498,8 @@ void meson_venc_hdmi_mode_set(struct meson_drm *priv, int vic,
writel_relaxed((use_enci ? 1 : 2) |
(mode->flags & DRM_MODE_FLAG_PHSYNC ? 1 << 2 : 0) |
(mode->flags & DRM_MODE_FLAG_PVSYNC ? 1 << 3 : 0) |
- 4 << 5 |
- (venc_repeat ? 1 << 8 : 0) |
+ (ycrcb_map << 5) |
+ (venc_repeat || yuv420_mode ? 1 << 8 : 0) |
(hdmi_repeat ? 1 << 12 : 0),
priv->io_base + _REG(VPU_HDMI_SETTING));
diff --git a/drivers/gpu/drm/meson/meson_venc.h b/drivers/gpu/drm/meson/meson_venc.h
index 1abdcbdf51c0..88ded5451c49 100644
--- a/drivers/gpu/drm/meson/meson_venc.h
+++ b/drivers/gpu/drm/meson/meson_venc.h
@@ -23,6 +23,15 @@ enum {
MESON_VENC_MODE_HDMI,
};
+enum {
+ MESON_VENC_MAP_CR_Y_CB = 0,
+ MESON_VENC_MAP_Y_CB_CR,
+ MESON_VENC_MAP_Y_CR_CB,
+ MESON_VENC_MAP_CB_CR_Y,
+ MESON_VENC_MAP_CB_Y_CR,
+ MESON_VENC_MAP_CR_CB_Y,
+};
+
struct meson_cvbs_enci_mode {
unsigned int mode_tag;
unsigned int hso_begin; /* HSO begin position */
@@ -60,6 +69,8 @@ extern struct meson_cvbs_enci_mode meson_cvbs_enci_ntsc;
void meson_venci_cvbs_mode_set(struct meson_drm *priv,
struct meson_cvbs_enci_mode *mode);
void meson_venc_hdmi_mode_set(struct meson_drm *priv, int vic,
+ unsigned int ycrcb_map,
+ bool yuv420_mode,
const struct drm_display_mode *mode);
unsigned int meson_venci_get_field(struct meson_drm *priv);
--
2.22.0
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