From nobody Tue Feb 10 12:40:09 2026 Received: from layka.disroot.org (layka.disroot.org [178.21.23.139]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C523022F16E; Sat, 24 Jan 2026 17:21:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.21.23.139 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769275302; cv=none; b=XFQrLmPCcCp1N+0CHVsHgBUW94A1oAipO+GoCzPfgI64w6MufKlOdsveftcSOMPVj0J9AxvdzRMmsVQZ9AdfpApMamVuT06XVj8M2uHogqf+IquRx/WuV+/YzKnc8rlNQmMD8faLId5ErZr0/Ae3y3KB9RCFrPbHHFnCEaixrnQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769275302; c=relaxed/simple; bh=klI/8DtlWetqET+K6snjmlkQ5ErwnNBTMyoeJFBz9+M=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rT3950ga25KxX1+YsBuioMgPtDRjK6lpIT2PzUzelcVNv81kM4yk8Jpvfb8m58U3FPrc5/zPLDXGZ1je7FLJXM4YXIXl9SxMsmXy7sFS/hEPA7nSkaFXbZiCSUaTOc5P8rj0Y7wt+t/NeHEDsDCKQ/SCDmjghMJ74GELVNRtFNk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=disroot.org; spf=pass smtp.mailfrom=disroot.org; dkim=pass (2048-bit key) header.d=disroot.org header.i=@disroot.org header.b=Wp9nb7MG; arc=none smtp.client-ip=178.21.23.139 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=disroot.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=disroot.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=disroot.org header.i=@disroot.org header.b="Wp9nb7MG" Received: from [127.0.0.1] (localhost [127.0.0.1]) by disroot.org (Postfix) with ESMTP id 4CCF326FEF; Sat, 24 Jan 2026 18:21:37 +0100 (CET) X-Virus-Scanned: SPAM Filter at disroot.org Received: from layka.disroot.org ([127.0.0.1]) by localhost (disroot.org [127.0.0.1]) (amavis, port 10024) with ESMTP id aP7TyxFD8zZK; Sat, 24 Jan 2026 18:21:36 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=disroot.org; s=mail; t=1769275296; bh=klI/8DtlWetqET+K6snjmlkQ5ErwnNBTMyoeJFBz9+M=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=Wp9nb7MGtgs06wn2LUecVfQm+w3HcKup8A1sOo8yRn8ecmHqKhWdGQFAK9KyjWb5/ PdfYm8jus4fv6LOauMc8YyeRHwU407LwrmCmrsumCAPyicelSxY1sPe55N2wb8Jd3f +v7Gbd8w1rJ3NrswCu+zhU1SJXGQWEqvimQi+cxX1xXsHFpfrV6FNka8hN4MxA+w7k 85WBXS+cA8aral0QWDTkuXooKj8r9PNrSvbWuQws+M1uIccZI+OMXyJgUsrovuUiD1 S56VeXSMsLXW6tUEl7w9Fo0TxT00PBjt+UwsfcKjszzjA/iQxXhy3qpqeUiXdIoHS0 80Vr6XBot6qyg== From: Kaustabh Chakraborty Date: Sat, 24 Jan 2026 22:50:47 +0530 Subject: [PATCH 2/3] drm/bridge: samsung-dsim: enable MFLUSH_VS for Exynos 7870 DSIM Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260124-exynos-dsim-fixes-v1-2-122d047a23d1@disroot.org> References: <20260124-exynos-dsim-fixes-v1-0-122d047a23d1@disroot.org> In-Reply-To: <20260124-exynos-dsim-fixes-v1-0-122d047a23d1@disroot.org> To: Inki Dae , Jagan Teki , Marek Szyprowski , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Kaustabh Chakraborty , stable@vger.kernel.org Commit a36c533ad3e1 ("drm/bridge: samsung-dsim: Always flush display FIFO on vsync pulse") intends to enable FIFO flushing at v-sync pulse by not setting the active-low MFLUSH_VS bit. However, in Exynos 7870 DSIM, the MFLUSH_VS bit is active-high. There is no publicly available documentation to the best of my knowledge, but downstream kernel code [1] supports this claim. Enable the bit for Exynos 7870. Cc: stable@vger.kernel.org # v6.17 and later Link: https://github.com/samsungexynos7870/android_kernel_samsung_exynos787= 0/blob/a3762bb1761aec8543fae511b087da620e24cee5/drivers/video/fbdev/exynos/= decon_7870/dsim_reg_7870.c#L699 [1] Signed-off-by: Kaustabh Chakraborty --- drivers/gpu/drm/bridge/samsung-dsim.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge= /samsung-dsim.c index 975f8b50ae660..91f230953a49f 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -1089,6 +1089,13 @@ static int samsung_dsim_init_link(struct samsung_dsi= m *dsi) reg |=3D DSIM_HBP_DISABLE_MODE; if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_NO_HSA) reg |=3D DSIM_HSA_DISABLE_MODE; + + /* + * For some hardware types, DSIM_MFLUSH_VS bit needs to be + * enabled explicitly. + */ + if (dsi->plat_data->hw_type =3D=3D DSIM_TYPE_EXYNOS7870) + reg |=3D DSIM_MFLUSH_VS; } =20 if (dsi->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET) --=20 2.52.0