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

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Message-Id: <VGGGRQ.1IX0AMZPBZBT3@crapouillou.net>
Date:   Mon, 12 Apr 2021 15:34:07 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>
Cc:     Sam Ravnborg <sam@...nborg.org>, od@...c.me,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] drm/ingenic: Fix pixclock rate for 24-bit serial panels

Hi,

Can I have an ACK for this patch?

Then I can apply it to drm-misc-next-fixes.

Cheers,
-Paul


Le mar. 23 mars 2021 à 14:40, 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>
> ---
>  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
>