From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751355AbeBRMRa (ORCPT ); Sun, 18 Feb 2018 07:17:30 -0500 Received: from mail-wr0-f193.google.com ([209.85.128.193]:40328 "EHLO mail-wr0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751292AbeBRMR2 (ORCPT ); Sun, 18 Feb 2018 07:17:28 -0500 X-Google-Smtp-Source: AH8x2261pce/wyGYTfFWm/hDTBQUQBEgIiUy1NMZ29HO33hM+PB/vHyg3cIkUx99Ey1/l4YGYoMPuw== Subject: Re: [PATCH] drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA To: Kai-Heng Feng , airlied@linux.ie Cc: daniel.vetter@intel.com, gustavo@padovan.org, seanpaul@chromium.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20180218085359.7817-1-kai.heng.feng@canonical.com> From: Mario Kleiner Message-ID: Date: Sun, 18 Feb 2018 13:17:25 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180218085359.7817-1-kai.heng.feng@canonical.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/18/2018 09:53 AM, Kai-Heng Feng wrote: > Similar to commit e10aec652f31 ("drm/edid: Add 6 bpc quirk for display > AEO model 0."), the EDID reports "DFP 1.x compliant TMDS" but it support > 6bpc instead of 8 bpc. > > Hence, use 6 bpc quirk for this panel. > > Fixes: 196f954e2509 ("drm/i915/dp: Revert "drm/i915/dp: fall back to 18 bpp when sink capability is unknown"") > BugLink: https://bugs.launchpad.net/bugs/1749420 > Signed-off-by: Kai-Heng Feng > --- > drivers/gpu/drm/drm_edid.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index ddd537914575..d9c8d718e261 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -113,6 +113,9 @@ static const struct edid_quirk { > /* AEO model 0 reports 8 bpc, but is a 6 bpc panel */ > { "AEO", 0, EDID_QUIRK_FORCE_6BPC }, > > + /* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */ > + { "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC }, > + > /* Belinea 10 15 55 */ > { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, > { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, > Reviewed-by: Mario Kleiner