Since the bootlaoder may set the RELAY_MODE to gamma be for the kerenl,
we have to clear the RELAY_MODE bit to make sure that the gamma is
enabled correctly.
Fixes: b10023b03082 ("FROMGIT: drm/mediatek: Separate gamma module")
Signed-off-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
index d706f76fd30e..15fe2a4f98de 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
@@ -18,6 +18,7 @@
#define DISP_GAMMA_EN 0x0000
#define GAMMA_EN BIT(0)
#define DISP_GAMMA_CFG 0x0020
+#define RELAY_MODE BIT(0)
#define GAMMA_LUT_EN BIT(1)
#define GAMMA_DITHERING BIT(2)
#define DISP_GAMMA_SIZE 0x0030
@@ -99,6 +100,7 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
if (state->gamma_lut) {
reg = readl(regs + DISP_GAMMA_CFG);
+ reg = reg & ~RELAY_MODE;
reg = reg | GAMMA_LUT_EN;
writel(reg, regs + DISP_GAMMA_CFG);
lut_base = regs + DISP_GAMMA_LUT;
--
2.18.0
