linux-kernel - Re: [PATCH] drm/i915: Force DPCD backlight mode for HP CML 2020 system

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Message-ID: <87k12qigpw.fsf@intel.com>
Date:   Wed, 08 Apr 2020 10:23:07 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list\:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/i915: Force DPCD backlight mode for HP CML 2020 system

On Tue, 07 Apr 2020, Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:
> There's another Samsung OLED panel needs to use DPCD aux interface to
> control backlight.

Acked-by: Jani Nikula <jani.nikula@...el.com>

>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  drivers/gpu/drm/drm_dp_helper.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index c6fbe6e6bc9d..d0cfee3b7a65 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -1299,6 +1299,8 @@ static const struct edid_quirk edid_quirk_list[] = {
>  	 * only supports DPCD backlight controls
>  	 */
>  	{ MFG(0x4c, 0x83), PROD_ID(0x41, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
> +	/* HP CML 2020 system */
> +	{ MFG(0x4c, 0x83), PROD_ID(0x45, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
>  	/*
>  	 * Some Dell CML 2020 systems have panels support both AUX and PWM
>  	 * backlight control, and some only support AUX backlight control. All

-- 
Jani Nikula, Intel Open Source Graphics Center