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

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Message-ID: <CAOw6vb+zKuD-ijxQDtQwyozP6budBAKECTevUf83EEvqaDMQPQ@mail.gmail.com>
Date:   Mon, 12 Dec 2016 09:58:49 -0500
From:   Sean Paul <seanpaul@...omium.org>
To:     Caesar Wang <wxt@...k-chips.com>, Archit <architt@...eaurora.org>
Cc:     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 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>

> 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
>