[PATCH 5.5 224/399] drm/mediatek: Add gamma property according to hardware capability

Greg Kroah-Hartman
2020-02-21T07:53:19Z

From: Yongqiang Niu <yongqiang.niu@mediatek.com>

[ Upstream commit 4cebc1de506fa753301266a5a23bb21bca52ad3a ]

If there is no gamma function in the crtc
display path, don't add gamma property
for crtc

Fixes: 2f3f4dda747c ("drm/mediatek: Add gamma correction.")
Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Signed-off-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 4132cd114a037..c3f5111fd563f 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -641,6 +641,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
int pipe = priv->num_pipes;
int ret;
int i;
+ uint gamma_lut_size = 0;

if (!path)
return 0;
@@ -691,6 +692,9 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
}

mtk_crtc->ddp_comp[i] = comp;
+
+ if (comp->funcs && comp->funcs->gamma_set)
+ gamma_lut_size = MTK_LUT_SIZE;
}

for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
@@ -711,8 +715,10 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
NULL, pipe);
if (ret < 0)
return ret;
- drm_mode_crtc_set_gamma_size(&mtk_crtc->base, MTK_LUT_SIZE);
- drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, false, MTK_LUT_SIZE);
+
+ if (gamma_lut_size)
+ drm_mode_crtc_set_gamma_size(&mtk_crtc->base, gamma_lut_size);
+ drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, false, gamma_lut_size);
priv->num_pipes++;

return 0;
--
2.20.1