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Subject: Re: [PATCH] drm/i915: Force DPCD backlight mode for HP Spectre x360
 Convertible 13t-aw100
From:   Kai-Heng Feng <kai.heng.feng@canonical.com>
In-Reply-To: <20200323053528.3147-1-kai.heng.feng@canonical.com>
Date:   Fri, 27 Mar 2020 19:03:27 +0800
Cc:     Thomas Zimmermann <tzimmermann@suse.de>,
        "open list:DRM DRIVERS" <dri-devel@lists.freedesktop.org>,
        open list <linux-kernel@vger.kernel.org>
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Message-Id: <41FD4AD2-81F9-45E8-B5D6-9CC255D0581B@canonical.com>
References: <20200323053528.3147-1-kai.heng.feng@canonical.com>
To:     Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        mripard@kernel.org, airlied@linux.ie, daniel@ffwll.ch
Sender: linux-kernel-owner@vger.kernel.org
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Hi,

> On Mar 23, 2020, at 13:35, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
> 
> There's another OLED panel needs to use DPCD aux interface to control
> backlight.
> 
> BugLink: https://bugs.launchpad.net/bugs/1860303
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

Would it be possible to review this?
I'd like to send a similar quirk for a new panel, and I want to avoid causing any merge conflict.

Kai-Heng

> ---
> 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 8ba4531e808d..a0d4314663de 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -1301,6 +1301,8 @@ 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 Spectre x360 Convertible 13t-aw100 */
> +	{ MFG(0x4c, 0x83), PROD_ID(0x42, 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
> -- 
> 2.17.1
>