linux-kernel - Re: [PATCH V3] drm/bridge: adv7511: Fix Intermittent EDID failures

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Message-ID: <4qarlw55zijv7vgl3q4t4cvxlzjeql4cr5734bgozhc7ddc7q2@2f3wis3c64cq>
Date: Tue, 2 Jul 2024 00:26:18 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Adam Ford <aford173@...il.com>
Cc: dri-devel@...ts.freedesktop.org, aford@...conembedded.com, 
	Liu Ying <victor.liu@....com>, Andrzej Hajda <andrzej.hajda@...el.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] drm/bridge: adv7511: Fix Intermittent EDID failures

On Sun, Jun 30, 2024 at 05:19:31PM GMT, Adam Ford wrote:
> In the process of adding support for shared IRQ pins, a scenario
> was accidentally created where adv7511_irq_process returned
> prematurely causing the EDID to fail randomly.
> 
> Since the interrupt handler is broken up into two main helper functions,
> update both of them to treat the helper functions as IRQ handlers. These
> IRQ routines process their respective tasks as before, but if they
> determine that actual work was done, mark the respective IRQ status
> accordingly, and delay the check until everything has been processed.
> 
> This should guarantee the helper functions don't return prematurely
> while still returning proper values of either IRQ_HANDLED or IRQ_NONE.
> 
> Reported-by: Liu Ying <victor.liu@....com>
> Fixes: f3d9683346d6 ("drm/bridge: adv7511: Allow IRQ to share GPIO pins")
> Signed-off-by: Adam Ford <aford173@...il.com>
> Tested-by: Liu Ying <victor.liu@....com> # i.MX8MP EVK ADV7535 EDID retrieval w/o IRQ
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> V3:  Remove unnecessary declaration of ret by evaluating the return
>      code of regmap_read directly.
> 
> V2:  Fix uninitialized cec_status
>      Cut back a little on error handling to return either IRQ_NONE or
>      IRQ_HANDLED.
> 

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


-- 
With best wishes
Dmitry