Re: [PATCH] drm/bridge: analogix_dp: set the DPCD600 during disabling the psr
From: Sean Paul
Date: Wed Dec 14 2016 - 05:00:38 EST
On Wed, Dec 14, 2016 at 12:03 AM, Archit Taneja <architt@xxxxxxxxxxxxxx> wrote:
> On 12/12/2016 08:28 PM, Sean Paul wrote:
>> On Fri, Dec 9, 2016 at 9:49 PM, Caesar Wang <wxt@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>
> 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?
4.11 is totally fine.
>>> Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
>>> 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
>>> 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,
>>> + 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;
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