From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793829563; b=BNXkUgW6cTcv7Rs9edfg/mDA+jchP67yDZhJYtJRuzl8Sk7OFIYkoOm68xqHDvrEZN/C YfOJGcznnQCKEKmECSP2wkTQsO5qgqtneP6q5Oa+tvGFcrvcZT4qHXf9YYYBKrAEuloMc 979KFTTYljPKw6adugGpsPEJ74lqoA/CEqPIIWAzLlsdTi8hK94zAtquzq7XxtN+7O7/2 z2flCJBeI9d/0GRC+vQwXzI5jf3MAhFTHcNare9uIRE2VF2Xt/gzmwENuCeyYFh0Zplne IGs9OEwCS1sY0ipjEy0r3T5lA8elgoQVvAW8rU5UEhuuoBf9PniqY8VIzFvlxKSKEuw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793829563; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=CmYS/qdqQwyKajKofigjMWYHWiDh0i/LJ/Uxe4vimO0=; b=rGPTfuWola9F/NaUx+SsZjx8RHAZAEHZnk6UZOF2TRvTgD+3mxoeAIUuw4Ln4phSkTqA Azyx2teBKGRM1Hics6jFKJxosusx+X/7xD0j4FYIXl8jxP4GcS4sVPj/P/JafjcJ7S2pN 53E274SKAh446WtrKkK8vfdzJq9ih0ejAqztOTtxja/+X/ttDX2Z2hrejl/Al5O2rw8dg ZSY3/44Mvqo9+scxEpGKYXsz+fBSH5NDg9Rdjq7gdx1uaw7zI1MQ6esAii/XjWKprPHDk aUi5O6RpLXCyhDOQeIzTUfeC7ueZCtPSLaaWkstZ8ZLbC25tkVub1WI8ozrbUe+Ld9A== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b="c/IwjwIw"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00719606A33E; Wed, 4 Nov 2026 21:59:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=c/IwjwIw Received: by smtp.kernel.org (Postfix) with ESMTPSA id 742291F0093A; Wed, 4 Nov 2026 21:59:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793829562; bh=CmYS/qdqQwyKajKofigjMWYHWiDh0i/LJ/Uxe4vimO0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=c/IwjwIwK7ADaxrYCigpatE5QkUIJrTvBqi9NOcUdwo6lh1OjP9n6MgoLTxCXyJqB wWNWL6/g5iMf+ukGFeOkGcHdqtWCZ4J0fd4ngB4BgnXhEr/7I9fOffrA9rbBXiJS8a UA1Sfx3yKJQzbAkULLkicvYHfybYUhXzAS6kU3k8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dio Zhang , Douglas Anderson , Sasha Levin Subject: [PATCH 6.18 0204/1005] drm/panel: panel-edp: Adjust T8 timing for AUO B116XAK01.6 and B140XTK02.4 Date: Wed, 4 Nov 2026 15:58:57 -0500 Message-ID: <20261104211049.512130364@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261104211043.516122098@linuxfoundation.org> References: <20261104211043.516122098@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dio Zhang [ Upstream commit 0d40cab39158704e372240ed9821a00bfe117125 ] Screen garbage or flickering can be observed during mode changes (such as VT switches) on systems using the AUO B116XAK01.6 and B140XTK02.4 panels. This occurs because the backlight is enabled before the video signal stabilizes. Waveform measurements show that the panel signal takes around 140ms to stabilize after a mode change, meaning the previous 50ms T8 timing was insufficient. To resolve this issue, adjust the eDP panel delay entry from delay_200_500_e50 to delay_200_500_e200 (increasing T8 from 50ms to 200ms). This matches the updated panel specifications from AUO, which now formally define T8 as 200ms to mask any display abnormalities during mode changes. Signed-off-by: Dio Zhang Reviewed-by: Douglas Anderson Signed-off-by: Douglas Anderson Link: https://patch.msgid.link/20260720025358.2781136-1-dioyc_zhang@compal.corp-partner.google.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/panel/panel-edp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c index 0da04d75e4e96..614c63e95c357 100644 --- a/drivers/gpu/drm/panel/panel-edp.c +++ b/drivers/gpu/drm/panel/panel-edp.c @@ -1901,7 +1901,7 @@ static const struct edp_panel_entry edp_panels[] = { EDP_PANEL_ENTRY('A', 'U', 'O', 0x145c, &delay_200_500_e50, "B116XAB01.4"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x1999, &delay_200_500_e50, "Unknown"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x1e9b, &delay_200_500_e50, "B133UAN02.1"), - EDP_PANEL_ENTRY('A', 'U', 'O', 0x1ea5, &delay_200_500_e50, "B116XAK01.6"), + EDP_PANEL_ENTRY('A', 'U', 'O', 0x1ea5, &delay_200_500_e200, "B116XAK01.6"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x203d, &delay_200_500_e50, "B140HTN02.0"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x208d, &delay_200_500_e50, "B140HTN02.1"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x235c, &delay_200_500_e50, "B116XTN02.3"), @@ -1921,7 +1921,7 @@ static const struct edp_panel_entry edp_panels[] = { EDP_PANEL_ENTRY('A', 'U', 'O', 0x635c, &delay_200_500_e50, "B116XAN06.3"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x639c, &delay_200_500_e50, "B140HAK02.7"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x643d, &delay_200_500_e50, "B140HAN06.4"), - EDP_PANEL_ENTRY('A', 'U', 'O', 0x67a8, &delay_200_500_e50, "B140XTK02.4"), + EDP_PANEL_ENTRY('A', 'U', 'O', 0x67a8, &delay_200_500_e200, "B140XTK02.4"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x723c, &delay_200_500_e50, "B140XTN07.2"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x73aa, &delay_200_500_e50, "B116XTN02.3"), EDP_PANEL_ENTRY('A', 'U', 'O', 0x8594, &delay_200_500_e50, "B133UAN01.0"), -- 2.53.0