linux-kernel - [PATCH 4.9 057/212] omapfb: dss: Fix max fclk divider for omap36xx

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Message-Id: <20200820091605.252122996@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:20:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adam Ford <aford173@...il.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Dave Airlie <airlied@...il.com>,
        Rob Clark <robdclark@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [PATCH 4.9 057/212] omapfb: dss: Fix max fclk divider for omap36xx

From: Adam Ford <aford173@...il.com>

commit 254503a2b186caa668a188dbbd7ab0d25149c0a5 upstream.

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> #4.5+
Signed-off-by: Adam Ford <aford173@...il.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: Dave Airlie <airlied@...il.com>
Cc: Rob Clark <robdclark@...il.com>
[b.zolnierkie: mark patch as applicable to stable 4.5+ (was 4.9+)]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200630182636.439015-1-aford173@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/video/fbdev/omap2/omapfb/dss/dss.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/video/fbdev/omap2/omapfb/dss/dss.c
+++ b/drivers/video/fbdev/omap2/omapfb/dss/dss.c
@@ -843,7 +843,7 @@ static const struct dss_features omap34x
 };
 
 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,