From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Pinchart Subject: Re: [PATCH v2 15/29] drm/bridge/synopsys: dw-hdmi: Enable workaround for v2.12a Date: Tue, 09 Oct 2018 20:40:44 +0300 Message-ID: <3616158.EzHeIcd69b@avalon> References: <20181007093905.11253-1-jernej.skrabec@siol.net> <20181007093905.11253-16-jernej.skrabec@siol.net> Reply-To: laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: Sender: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org In-Reply-To: <20181007093905.11253-16-jernej.skrabec-gGgVlfcn5nU@public.gmane.org> List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , To: Jernej Skrabec Cc: maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org, wens-jdAy2FN1RRM@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, sboyd-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, airlied-cv59FeDIM0c@public.gmane.org, architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, a.hajda-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org List-Id: devicetree@vger.kernel.org Hi Jernej, Thank you for the patch. On Sunday, 7 October 2018 12:38:51 EEST Jernej Skrabec wrote: > It turns out that even new DW HDMI controllers exhibits same magenta > line issues as older versions. > > Enable workaround for v2.12a. This doesn't affect the platforms I maintain, so I can't really test this, but I'm wondering whether there could be other platforms using a v2.12a DW HDMI that wouldn't need the workaround. My platforms use a previous version, namely v2.01a. The workaround for that version has been enabled by commit 9c305eb442f3b371fc722ade827bbf673514123e Author: Neil Armstrong Date: Fri Feb 23 12:44:37 2018 +0100 drm: bridge: dw-hdmi: Fix overflow workaround for Amlogic Meson GX SoCs I haven't paid too much attention to the patch back then, and have now double- checked the HDMI output on R-Car Gen3. Enabling the workaround doesn't cause any regression, and reverting the commit doesn't cause any issue either. I thus wonder whether we shouldn't enable the workaround with count = 1 in the default case instead of adding new IP core versions to the list. It would be nice if someone from Synopsys could comment on this. > Reviewed-by: Chen-Yu Tsai > Signed-off-by: Jernej Skrabec > --- > drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index > 5971976284bf..df1c7a2d6961 100644 > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c > @@ -1664,6 +1664,7 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi > *hdmi) case 0x131a: > case 0x132a: > case 0x201a: > + case 0x212a: > count = 1; > break; > default: -- Regards, Laurent Pinchart