* [RESEND v4 PATCH] drm/mediatek: Fix mtk_cec_mask()
@ 2022-03-15 23:23 Miles Chen
2022-04-07 1:16 ` CK Hu
0 siblings, 1 reply; 2+ messages in thread
From: Miles Chen @ 2022-03-15 23:23 UTC (permalink / raw)
To: Chun-Kuang Hu, Philipp Zabel, David Airlie, Daniel Vetter,
Matthias Brugger, Jie Qiu, Junzhi Zhao
Cc: Miles Chen, Zhiqiang Lin, CK Hu, AngeloGioacchino Del Regno,
dri-devel, linux-mediatek, linux-arm-kernel, linux-kernel
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")
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Zhiqiang Lin <zhiqiang.lin@mediatek.com>
Cc: CK Hu <ck.hu@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
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,
--
2.18.0
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [RESEND v4 PATCH] drm/mediatek: Fix mtk_cec_mask()
2022-03-15 23:23 [RESEND v4 PATCH] drm/mediatek: Fix mtk_cec_mask() Miles Chen
@ 2022-04-07 1:16 ` CK Hu
0 siblings, 0 replies; 2+ messages in thread
From: CK Hu @ 2022-04-07 1:16 UTC (permalink / raw)
To: Miles Chen, Chun-Kuang Hu, Philipp Zabel, David Airlie,
Daniel Vetter, Matthias Brugger, Jie Qiu, Junzhi Zhao
Cc: Zhiqiang Lin, AngeloGioacchino Del Regno, dri-devel,
linux-mediatek, linux-arm-kernel, linux-kernel
Hi, Miles:
On Wed, 2022-03-16 at 07:23 +0800, 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.
Applied to mediatek-drm-next [1], thanks.
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next
Regards,
CK
>
> Fixes: 8f83f26891e1 ("drm/mediatek: Add HDMI support")
> Signed-off-by: Miles Chen <miles.chen@mediatek.com>
> Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
> Cc: Zhiqiang Lin <zhiqiang.lin@mediatek.com>
> Cc: CK Hu <ck.hu@mediatek.com>
> Cc: Matthias Brugger <matthias.bgg@gmail.com>
> Cc: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
>
> ---
>
> 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,
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2022-04-07 1:16 ` CK Hu
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