2022-04-08 01:48:27

by Nícolas F. R. A. Prado

Subject: [PATCH] drm/mediatek: dpi: Use mt8183 output formats for mt8192

The configuration for mt8192 was incorrectly using the output formats
from mt8173. Since the output formats for mt8192 are instead the same
ones as for mt8183, which require two bus samples per pixel, the
pixelclock and DDR edge setting were misconfigured. This made external
displays unable to show the image.

Fix the issue by correcting the output format for mt8192 to be the same
as for mt8183, fixing the usage of external displays for mt8192.

Signed-off-by: Nícolas F. R. A. Prado <[email protected]>

---

drivers/gpu/drm/mediatek/mtk_dpi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 4554e2de1430..e61cd67b978f 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -819,8 +819,8 @@ static const struct mtk_dpi_conf mt8192_conf = {
.cal_factor = mt8183_calculate_factor,
.reg_h_fre_con = 0xe0,
.max_clock_khz = 150000,
- .output_fmts = mt8173_output_fmts,
- .num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
+ .output_fmts = mt8183_output_fmts,
+ .num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
};

static int mtk_dpi_probe(struct platform_device *pdev)
--
2.35.1

2022-04-08 02:11:38

by Nícolas F. R. A. Prado

Subject: Re: [PATCH] drm/mediatek: dpi: Use mt8183 output formats for mt8192

On Fri, Apr 08, 2022 at 09:36:17AM +0800, CK Hu wrote:
> Hi, Jitao & Rex:
>
> Please help to comment on this patch.

Hi Chuang,

I already sent a v2 of this patch [1] because I forgot to add the Fixes tag.
Sorry for the noise.

Thanks,
N?colas

[1] https://lore.kernel.org/all/[email protected]/

>
> On Thu, 2022-04-07 at 21:19 -0400, N?colas F. R. A. Prado wrote:
> > The configuration for mt8192 was incorrectly using the output formats
> > from mt8173. Since the output formats for mt8192 are instead the same
> > ones as for mt8183, which require two bus samples per pixel, the
> > pixelclock and DDR edge setting were misconfigured. This made
> > external
> > displays unable to show the image.
> >
> > Fix the issue by correcting the output format for mt8192 to be the
> > same
> > as for mt8183, fixing the usage of external displays for mt8192.
> >
> > Signed-off-by: N?colas F. R. A. Prado <[email protected]>
> >
> > ---
> >
> > drivers/gpu/drm/mediatek/mtk_dpi.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > index 4554e2de1430..e61cd67b978f 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -819,8 +819,8 @@ static const struct mtk_dpi_conf mt8192_conf = {
> > .cal_factor = mt8183_calculate_factor,
> > .reg_h_fre_con = 0xe0,
> > .max_clock_khz = 150000,
> > - .output_fmts = mt8173_output_fmts,
> > - .num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> > + .output_fmts = mt8183_output_fmts,
> > + .num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
> > };
> >
> > static int mtk_dpi_probe(struct platform_device *pdev)
>