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From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Adam Ford <aford173@gmail.com>, <linux-fbdev@vger.kernel.org>
Cc: <stable@vger.kernel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Dave Airlie <airlied@gmail.com>, Rob Clark <robdclark@gmail.com>,
	<linux-omap@vger.kernel.org>, <dri-devel@lists.freedesktop.org>,
	<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] omapfb: dss: Fix max fclk divider for omap36xx
Date: Fri, 3 Jul 2020 10:17:29 +0300
Message-ID: <b9052a12-af5a-c1b9-5b86-907eac470cf8@ti.com> (raw)
In-Reply-To: <20200630182636.439015-1-aford173@gmail.com>

On 30/06/2020 21:26, 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@vger.kernel.org> #4.9+
> Signed-off-by: Adam Ford <aford173@gmail.com>
> ---
> 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,
> 

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

  Tomi

-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200630182652eucas1p1ce5e07b065127e32ab734f4447c2f735@eucas1p1.samsung.com>
2020-06-30 18:26 ` Adam Ford
2020-07-03  7:17   ` Tomi Valkeinen [this message]
2020-07-03 19:36     ` Sam Ravnborg
2020-07-06  6:02       ` Tomi Valkeinen
2020-07-06 11:18         ` Adam Ford
2020-07-08 23:37           ` Adam Ford
2020-07-09  6:10             ` Greg KH
2020-07-10 14:23   ` Bartlomiej Zolnierkiewicz

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