From nobody Mon Feb 9 23:38:59 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 1CFFA33B6F0; Sat, 7 Feb 2026 19:14:23 +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=1770491664; cv=none; b=VjPQunkN4+G6fUmwddpP9C0x7aNsePkh5h2iUYj2GwIrmf9X13MMLy0eX4kDffUMxfbORs3tciXOExa4uprmHKyOBVB5gliv92+4P/1G2JoQVvWv8+G1YSoeVRwiotOp76+fIi1phU3yNS83AfmuNjMWHDudY8ukwaMMmfNQBr4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770491664; c=relaxed/simple; bh=TiYDGvrzsWr6bSZnAbY5TAGgZ/ddNnSDc0QvKT5qZ08=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=s+O/PJ5MYAg9xQXS2zg9+J7HvfYJUwybNRzMpmskxmaTI1DfJwTLNo2Fi/KQl76b23JQgLCaGayfDNWd2z3i2SduAp0zlmLn53AmJt0aKa2YiCo+FHK+l5XLPY91q4JiZ0l5XeSI86qilo/thEbntfmhFcmzFII+wA2yIAsZptM= 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=j07UJK2Q; 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="j07UJK2Q" Received: from [127.0.0.1] (localhost [127.0.0.1]) by disroot.org (Postfix) with ESMTP id BB30F264FC; Sat, 7 Feb 2026 20:14:22 +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 Ei-tSKNkFk4u; Sat, 7 Feb 2026 20:14:22 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=disroot.org; s=mail; t=1770491661; bh=TiYDGvrzsWr6bSZnAbY5TAGgZ/ddNnSDc0QvKT5qZ08=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=j07UJK2QMNRcoEj2Ig2fZARE12zRxDWtJUNBpZOYt2DRHstjPgBry6RywjVEgW52j LnWe+l183tzEWtO/tci/XCVr4D+sLJDgvn2RjtyHlo2I5Bxr1ptsdo5beSpxhe3VMr 5GYQBjddpnVc+9ksIo9p+S59QTYLEN7FWB9vJaqHvWcZe7gxmZh8EaYPMOTGHSyKbO q04KBbMa+OPW4q0+mIf4qm8yg3JC9mk3aOXAEWy7hIXxLLN3HyLZJ6De64ix3DDVkn 2RwNiwPOLyC34T3jgtZP2mPo6h2j0oXPiXm/PjDvHDgQmGEAzNS2wLdr+251x3CGVK 2bEDboaMKLdNw== From: Kaustabh Chakraborty Date: Sun, 08 Feb 2026 00:43:58 +0530 Subject: [PATCH v2 1/2] 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: <20260208-exynos-dsim-fixes-v2-1-a857e8130a2a@disroot.org> References: <20260208-exynos-dsim-fixes-v2-0-a857e8130a2a@disroot.org> In-Reply-To: <20260208-exynos-dsim-fixes-v2-0-a857e8130a2a@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/a3762bb1761ae/drivers/video/fbdev/exynos/decon_7870/dsim_reg_7870.c#= L699 [1] Tested-by: Marek Szyprowski 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 1d85e706c74b9..70f8946ad3b24 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