linux-kernel - Re: [PATCH] drm/ingenic: Fix pixclock rate for 24-bit serial panels

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Date:   Fri, 14 May 2021 19:26:28 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Paul Cercueil <paul@...pouillou.net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-mips@...r.kernel.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, od@...c.me,
        dri-devel@...ts.freedesktop.org, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] drm/ingenic: Fix pixclock rate for 24-bit serial panels



Am 13.05.21 um 14:29 schrieb Paul Cercueil:
> Hi,
> 
> Almost two months later,
> 
> 
> Le mar., mars 23 2021 at 14:40:08 +0000, Paul Cercueil 
> <paul@...pouillou.net> a écrit :
>> When using a 24-bit panel on a 8-bit serial bus, the pixel clock
>> requested by the panel has to be multiplied by 3, since the subpixels
>> are shifted sequentially.
>>
>> The code (in ingenic_drm_encoder_atomic_check) already computed
>> crtc_state->adjusted_mode->crtc_clock accordingly, but clk_set_rate()
>> used crtc_state->adjusted_mode->clock instead.
>>
>> Fixes: 28ab7d35b6e0 ("drm/ingenic: Properly compute timings when using 

>> a 3x8-bit panel")
>> Cc: stable@...r.kernel.org # v5.10
>> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> 
> Can I get an ACK for my patch?

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

> 
> Thanks!
> -Paul
> 
>> ---
>>  drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c 
>> b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> index d60e1eefc9d1..cba68bf52ec5 100644
>> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> @@ -342,7 +342,7 @@ static void ingenic_drm_crtc_atomic_flush(struct 
>> drm_crtc *crtc,
>>      if (priv->update_clk_rate) {
>>          mutex_lock(&priv->clk_mutex);
>>          clk_set_rate(priv->pix_clk,
>> -                 crtc_state->adjusted_mode.clock * 1000);
>> +                 crtc_state->adjusted_mode.crtc_clock * 1000);
>>          priv->update_clk_rate 
= false;
>>          mutex_unlock(&priv->clk_mutex);
>>      }
>> -- 
>> 2.30.2
>>
> 
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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