linux-kernel - Re: [PATCH v3] drm: adv7511: Fix low refresh rate register for ADV7533/5

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Date:   Tue, 18 Jul 2023 10:49:48 +0200
From:   Robert Foss <rfoss@...nel.org>
To:     Alexandru Ardelean <alex@...uggie.ro>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        bogdan.togorean@...log.com, nuno.sa@...log.com, daniel@...ll.ch,
        airlied@...il.com, jonas@...boo.se,
        Laurent.pinchart@...asonboard.com, neil.armstrong@...aro.org,
        andrzej.hajda@...el.com, festevam@...il.com
Subject: Re: [PATCH v3] drm: adv7511: Fix low refresh rate register for ADV7533/5

On Tue, Jul 18, 2023 at 10:42 AM Alexandru Ardelean <alex@...uggie.ro> wrote:
>
> From: Bogdan Togorean <bogdan.togorean@...log.com>
>
> For ADV7533 and ADV7535 low refresh rate is selected using
> bits [3:2] of 0x4a main register.
> So depending on ADV model write 0xfb or 0x4a register.
>
> Fixes: 2437e7cd88e8 ("drm/bridge: adv7533: Initial support for ADV7533")
> Reviewed-by: Nuno Sa <nuno.sa@...log.com>
> Signed-off-by: Bogdan Togorean <bogdan.togorean@...log.com>
> Signed-off-by: Alexandru Ardelean <alex@...uggie.ro>
> ---
>
> Changelog v2 -> v3:
> * https://lore.kernel.org/dri-devel/1c3fde3a873b0f948d3c4d37107c5bb67dc9f7bb.camel@gmail.com/T/#u
> * Added my S-o-b tag back
>
> Changelog v1 -> v2:
> * https://lore.kernel.org/dri-devel/20190716131005.761-1-bogdan.togorean@analog.com/
> * added Fixes: tag
> * added Reviewed-by: tag for Nuno
>
>
>  drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> index ddceafa7b637..09290a377957 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -786,8 +786,13 @@ static void adv7511_mode_set(struct adv7511 *adv7511,
>         else
>                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_NONE;
>
> -       regmap_update_bits(adv7511->regmap, 0xfb,
> -               0x6, low_refresh_rate << 1);
> +       if (adv7511->type == ADV7511)
> +               regmap_update_bits(adv7511->regmap, 0xfb,
> +                       0x6, low_refresh_rate << 1);
> +       else
> +               regmap_update_bits(adv7511->regmap, 0x4a,
> +                       0xc, low_refresh_rate << 2);
> +
>         regmap_update_bits(adv7511->regmap, 0x17,
>                 0x60, (vsync_polarity << 6) | (hsync_polarity << 5));
>
> --
> 2.41.0
>

This looks good, but I'm seeing some checkpatch style warnings, with
those fixed feel free to add my r-b.

CHECK: Alignment should match open parenthesis
#32: FILE: drivers/gpu/drm/bridge/adv7511/adv7511_drv.c:791:
+        regmap_update_bits(adv7511->regmap, 0xfb,
+            0x6, low_refresh_rate << 1);

CHECK: Alignment should match open parenthesis
#35: FILE: drivers/gpu/drm/bridge/adv7511/adv7511_drv.c:794:
+        regmap_update_bits(adv7511->regmap, 0x4a,
+            0xc, low_refresh_rate << 2);

total: 0 errors, 0 warnings, 2 checks, 15 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 1955dfe734e4 ("drm: adv7511: Fix low refresh rate register for
ADV7533/5") has style problems, please review.

NOTE: If any of the errors are false positives, please report