From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752555AbeBSKm5 (ORCPT ); Mon, 19 Feb 2018 05:42:57 -0500 Received: from mga12.intel.com ([192.55.52.136]:5574 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752307AbeBSKm4 (ORCPT ); Mon, 19 Feb 2018 05:42:56 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,534,1511856000"; d="scan'208";a="31892909" From: Jani Nikula To: Kai-Heng Feng , airlied@linux.ie Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Kai-Heng Feng , daniel.vetter@intel.com Subject: Re: [PATCH] drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA In-Reply-To: <20180218085359.7817-1-kai.heng.feng@canonical.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20180218085359.7817-1-kai.heng.feng@canonical.com> Date: Mon, 19 Feb 2018 12:42:52 +0200 Message-ID: <87woz99s5v.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 18 Feb 2018, 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"") Implies Cc: # v4.8+ > 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 }, -- Jani Nikula, Intel Open Source Technology Center