RE: [PATCH v3] drm/bridge: it6505: fix HDCP V match check is not performed correctly

[Hermes.Wu]

hi


-----Original Message-----
From: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> 
Sent: Thursday, January 9, 2025 9:09 PM
To: Hermes Wu (吳佳宏) <Hermes.Wu@xxxxxxxxxx>
Cc: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>; Neil Armstrong <neil.armstrong@xxxxxxxxxx>; Robert Foss <rfoss@xxxxxxxxxx>; Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>; Jonas Karlman <jonas@xxxxxxxxx>; Jernej Skrabec <jernej.skrabec@xxxxxxxxx>; Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>; Maxime Ripard <mripard@xxxxxxxxxx>; Thomas Zimmermann <tzimmermann@xxxxxxx>; David Airlie <airlied@xxxxxxxxx>; Simona Vetter <simona@xxxxxxxx>; AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>; dri-devel@xxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Pet Weng (翁玉芬) <Pet.Weng@xxxxxxxxxx>; Kenneth Hung (洪家倫) <Kenneth.Hung@xxxxxxxxxx>; treapking@xxxxxxxxxxxx
Subject: Re: [PATCH v3] drm/bridge: it6505: fix HDCP V match check is not performed correctly

On Thu, Jan 09, 2025 at 02:40:08PM +0800, Hermes Wu via B4 Relay wrote:
> From: Hermes Wu <Hermes.wu@xxxxxxxxxx>
> 
> The loop of V compare is expected to iterate for 5 times which compare 
> V array form av[0][] to av[4][].
> It should check loop counter reach the last statement "i == 5"
> before return true
> 
> Fixes: 0989c02c7a5c ("drm/bridge: it6505: fix HDCP CTS compare V 
> matching")
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
>Excuse me, where did you get that from?? I didn't r-b it (yet).

Sorry,

I think I just missing understanding about this tag.
I thought it should add if someone give advice to a path.

So I add it before you r-b it,

> Signed-off-by: Hermes Wu <Hermes.wu@xxxxxxxxxx>
> ---
> Changes in v3:
> - The V value compare loop from i = 0 to i = 4 and shall exit with i == 5 
>   if all V element matches
> - Link to v2: 
> https://lore.kernel.org/r/20250109-fix-hdcp-v-comp-v2-1-7dce0a59523f@i
> te.com.tw
> 
> Changes in v2:
> - pull the check of statment "i" out of V value check loop
> - Link to v1: 
> https://lore.kernel.org/r/20250108-fix-hdcp-v-comp-v1-1-9404811825cd@i
> te.com.tw
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
>--
>With best wishes
>Dmitry

Br.
Hermes