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

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Message-ID: <CAOw6vbJA+_38GOyki-FLTLiEEDnOkK8bcM+cSzZQx=p31a3jXA@mail.gmail.com>
Date:   Wed, 14 Dec 2016 05:00:09 -0500
From:   Sean Paul <seanpaul@...omium.org>
To:     Archit Taneja <architt@...eaurora.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 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.

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