[PATCH 4.9.y 1/3] drm/bridge: adv7511: Rework adv7511_power_on/off() so they can be reused internally

[Nhan Ngoc. Nguyen]

On 11/6/2017 2:57 PM, Greg KH wrote:
> On Fri, Nov 03, 2017 at 10:10:26AM +0700, Nhan Nguyen wrote:
>> From: John Stultz <john.stultz at linaro.org>
>>
>> commit 651e4769ba2a9f20c4b8a823ae2727bf7fa9c9f0 upstream.
>>
>> In chasing down issues with EDID probing, I found some
>> duplicated but incomplete logic used to power the chip on and
>> off.
>>
>> This patch refactors the adv7511_power_on/off functions, so
>> they can be used for internal needs.
>>
>> Cc: David Airlie <airlied at linux.ie>
>> Cc: Archit Taneja <architt at codeaurora.org>
>> Cc: Wolfram Sang <wsa+renesas at sang-engineering.com>
>> Cc: Lars-Peter Clausen <lars at metafoo.de>
>> Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
>> Cc: dri-devel at lists.freedesktop.org
>> Cc: stable at vger.kernel.org
>> Signed-off-by: John Stultz <john.stultz at linaro.org>
>> Signed-off-by: Archit Taneja <architt at codeaurora.org>
>> Signed-off-by: Thong Ho <thong.ho.px at rvc.renesas.com>
>> Signed-off-by: Nhan Nguyen <nhan.nguyen.yb at renesas.com>
>> Link: http://patchwork.freedesktop.org/patch/msgid/1484614372-15342-5-git-send-email-john.stultz@linaro.org
>> ---
>>   drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 15 +++++++++++----
>>   1 file changed, 11 insertions(+), 4 deletions(-)
> Why are you asking for these 3 patches to be backported to the 4.9
> stable tree?  What bugs are they fixing?  How do they meet the stable
> kernel rules?
>
> totally confused,
>
> greg k-h

This patch is re-writes the i2c address to ADV7511_REG_EDID_I2C_ADDR register to ensure its properly set before reading the EDID data.
In the past, the backporting is for Kernel v4.4 and you asked to port for 4.9 also.