linux-kernel - Re: [PATCH] drm/bridge: analogix_dp: set the DPCD600 during disabling the psr

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Message-ID: <9e2507fd-e5bb-40ce-a9a6-e4b978cd6d9a@codeaurora.org>
Date:   Thu, 15 Dec 2016 15:07:59 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Sean Paul <seanpaul@...omium.org>
Cc:     Caesar Wang <wxt@...k-chips.com>, Dave Airlie <airlied@...ux.ie>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-rockchip@...ts.infradead.org,
        Brian Norris <briannorris@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>
Subject: Re: [PATCH] drm/bridge: analogix_dp: set the DPCD600 during disabling
 the psr



On 12/14/2016 03:30 PM, Sean Paul wrote:
> On Wed, Dec 14, 2016 at 12:03 AM, Archit Taneja <architt@...eaurora.org> wrote:
>> Hi,
>>
>> On 12/12/2016 08:28 PM, Sean Paul wrote:
>>>
>>> On Fri, Dec 9, 2016 at 9:49 PM, Caesar Wang <wxt@...k-chips.com> wrote:
>>>>
>>>> Look likes, the BOE panel FW didn't ack the DPCD600 signal from the host
>>>> device, that will cause the panel hang on the startup display.
>>>> The root cause we use the fast link mode during enter and exit the psr,
>>>> this issue is gone if switching the fast link to main link mode.
>>>>
>>>
>>> Cc: Archit Taneja <architt@...eaurora.org>
>>
>>
>> Do we want this as a fix in 4.10? Or is it okay to get it in 4.11?
>> In other words, should this go to drm-misc-next or drm-misc-fixes?
>>
>
> Hi Archit,
> 4.11 is totally fine.

Thanks. Queued after some commit message cleanup.

Archit

>
> Sean
>
>
>> Thanks,
>> Archit
>>
>>
>>>
>>>> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
>>>> ---
>>>>
>>>>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 5 +++++
>>>>  1 file changed, 5 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>>> index 6e0447f..6a5347b 100644
>>>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>>> @@ -133,6 +133,7 @@ int analogix_dp_disable_psr(struct device *dev)
>>>>  {
>>>>         struct analogix_dp_device *dp = dev_get_drvdata(dev);
>>>>         struct edp_vsc_psr psr_vsc;
>>>> +       int ret;
>>>>
>>>>         if (!dp->psr_support)
>>>>                 return -EINVAL;
>>>> @@ -147,6 +148,10 @@ int analogix_dp_disable_psr(struct device *dev)
>>>>         psr_vsc.DB0 = 0;
>>>>         psr_vsc.DB1 = 0;
>>>>
>>>> +       ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER,
>>>> DP_SET_POWER_D0);
>>>> +       if (ret != 1)
>>>> +               dev_err(dp->dev, "Failed to set DP Power0 %d\n", ret);
>>>> +
>>>>         analogix_dp_send_psr_spd(dp, &psr_vsc);
>>>>         return 0;
>>>>  }
>>>> --
>>>> 2.7.4
>>>>
>>
>> --
>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
>> a Linux Foundation Collaborative Project

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project