Re: [PATCH v4] drm/mediatek: Fix mtk_cec_mask()

From: Matthias Brugger
Date: Fri Jan 14 2022 - 11:02:57 EST




On 03/01/2022 06:47, Miles Chen wrote:
In current implementation, mtk_cec_mask() writes val into target register
and ignores the mask. After talking to our hdmi experts, mtk_cec_mask()
should read a register, clean only mask bits, and update (val | mask) bits
to the register.

Fixes: 8f83f26891e1 ("drm/mediatek: Add HDMI support")


Normally there is no new line here.

Cc: Zhiqiang Lin <zhiqiang.lin@xxxxxxxxxxxx>
Cc: CK Hu <ck.hu@xxxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>


Neither here.

Signed-off-by: Miles Chen <miles.chen@xxxxxxxxxxxx>


But that are nit-picks. I leave it to the maintainer to decide if he want to fix that when applying the patch:

Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>

Thanks a lot,
Matthias

---

Change since v1:
add Fixes tag

Change since v2:
add explanation of mtk_cec_mask()

Change since v3:
change misleading subject and modify the commit message since this is a bug fix patch

---
drivers/gpu/drm/mediatek/mtk_cec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_cec.c b/drivers/gpu/drm/mediatek/mtk_cec.c
index e9cef5c0c8f7..cdfa648910b2 100644
--- a/drivers/gpu/drm/mediatek/mtk_cec.c
+++ b/drivers/gpu/drm/mediatek/mtk_cec.c
@@ -85,7 +85,7 @@ static void mtk_cec_mask(struct mtk_cec *cec, unsigned int offset,
u32 tmp = readl(cec->regs + offset) & ~mask;
tmp |= val & mask;
- writel(val, cec->regs + offset);
+ writel(tmp, cec->regs + offset);
}
void mtk_cec_set_hpd_event(struct device *dev,