linux-kernel - Re: [PATCH] omapfb: dss: Fix max fclk divider for omap36xx

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Message-ID: <e7bb19a5-774c-63c3-058f-1977d29cd94c@samsung.com>
Date:   Fri, 10 Jul 2020 16:23:56 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-fbdev@...r.kernel.org, stable@...r.kernel.org,
        Dave Airlie <airlied@...il.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Rob Clark <robdclark@...il.com>, linux-omap@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] omapfb: dss: Fix max fclk divider for omap36xx


On 6/30/20 8:26 PM, Adam Ford wrote:
> The drm/omap driver was fixed to correct an issue where using a
> divider of 32 breaks the DSS despite the TRM stating 32 is a valid
> number.  Through experimentation, it appears that 31 works, and
> it is consistent with the value used by the drm/omap driver.
> 
> This patch fixes the divider for fbdev driver instead of the drm.
> 
> Fixes: f76ee892a99e ("omapfb: copy omapdss & displays for omapfb")
> 
> Cc: <stable@...r.kernel.org> #4.9+
> Signed-off-by: Adam Ford <aford173@...il.com>

Applied to drm-misc-next tree, thanks.

(I marked patch as applicable to stable 4.5+ while merging)

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
> Linux 4.4 will need a similar patch, but it doesn't apply cleanly.
> 
> The DRM version of this same fix is:
> e2c4ed148cf3 ("drm/omap: fix max fclk divider for omap36xx")
> 
> 
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dss.c b/drivers/video/fbdev/omap2/omapfb/dss/dss.c
> index 7252d22dd117..bfc5c4c5a26a 100644
> --- a/drivers/video/fbdev/omap2/omapfb/dss/dss.c
> +++ b/drivers/video/fbdev/omap2/omapfb/dss/dss.c
> @@ -833,7 +833,7 @@ static const struct dss_features omap34xx_dss_feats = {
>  };
>  
>  static const struct dss_features omap3630_dss_feats = {
> -	.fck_div_max		=	32,
> +	.fck_div_max		=	31,
>  	.dss_fck_multiplier	=	1,
>  	.parent_clk_name	=	"dpll4_ck",
>  	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
>