linux-kernel - Re: [PATCH 1/8] drm/panel: himax-hx8394: Handle errors from mipi_dsi_dcs_set_display

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Message-ID: <rl75kajstjmm2nvzwx4mwjeeygzgj4p6fshl4zktdjs37bjj5x@cdwg4oghnpua>
Date: Mon, 20 May 2024 01:25:41 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Douglas Anderson <dianders@...omium.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Daniel Vetter <daniel@...ll.ch>, 
	David Airlie <airlied@...il.com>, Javier Martinez Canillas <javierm@...hat.com>, 
	Kamil Trzciński <ayufan@...fan.eu>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Ondrej Jirman <megi@....cz>, 
	Thomas Zimmermann <tzimmermann@...e.de>, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] drm/panel: himax-hx8394: Handle errors from
 mipi_dsi_dcs_set_display_on() better

On Fri, May 17, 2024 at 02:36:36PM -0700, Douglas Anderson wrote:
> If mipi_dsi_dcs_set_display_on() returned an error then we'd store
> that in the "ret" variable and jump to error handling. We'd then
> attempt an orderly poweroff. Unfortunately we then blew away the value
> stored in "ret". That means that if the orderly poweroff actually
> worked then we're return 0 (no error) from hx8394_enable() even though
> the panel wasn't enabled.
> 
> Fix this by not blowing away "ret".
> 
> Found by code inspection.
> 
> Fixes: 65dc9360f741 ("drm: panel: Add Himax HX8394 panel controller driver")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
>  drivers/gpu/drm/panel/panel-himax-hx8394.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


-- 
With best wishes
Dmitry