From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 55DD6FC72CB for ; Sun, 22 Mar 2026 17:02:25 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 908B010E1BE; Sun, 22 Mar 2026 17:02:24 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; secure) header.d=disroot.org header.i=@disroot.org header.b="Z65NM3eO"; dkim-atps=neutral Received: from layka.disroot.org (layka.disroot.org [178.21.23.139]) by gabe.freedesktop.org (Postfix) with ESMTPS id 37F7F10E1BE for ; Sun, 22 Mar 2026 17:02:23 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by disroot.org (Postfix) with ESMTP id D260B26E75; Sun, 22 Mar 2026 18:02:21 +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 uLtavyJ539ik; Sun, 22 Mar 2026 18:02:21 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=disroot.org; s=mail; t=1774198940; bh=iW7rNRh2ArJWOxm9/fuOocPIaTFuDAFc1tz6G/PVRKU=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=Z65NM3eObpu8kyaSTYSY8vm83xcXAschgnwWAP8aqijIT8g+lO+PO0AxfFkv4kKmr oxeVq8sEwLyWztt44CcSCrcsT8e6gQN7nHtrrJrnygWNO2u27Y3j7JDulv9SPllLpr EE8D6G2IFdCGBtLe6tIFEkfgFlubHag6jYCRJlzcInMOvH5C8lzkZNBdjHhFIuZKTv FiITvi3xRJ1xkXA/2S+U7WWRxEYwVcrbDV1uFBeIyyyURPbIwDREmRHSVS8pUB6LmB 7XO8hMVjcIy1k+IWlslTBM0oS3XKHsTYkl9w4frUSzIK0ZhQGx/9CUL85s3B0ObR+G 7E0TBy1lD4nyA== From: Kaustabh Chakraborty Date: Sun, 22 Mar 2026 22:32:06 +0530 Subject: [PATCH RESEND v2 1/2] drm/bridge: samsung-dsim: enable MFLUSH_VS for Exynos 7870 DSIM MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260322-exynos-dsim-fixes-v2-1-0069c9e1d9bf@disroot.org> References: <20260322-exynos-dsim-fixes-v2-0-0069c9e1d9bf@disroot.org> In-Reply-To: <20260322-exynos-dsim-fixes-v2-0-0069c9e1d9bf@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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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_exynos7870/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_dsim *dsi) reg |= DSIM_HBP_DISABLE_MODE; if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_NO_HSA) reg |= DSIM_HSA_DISABLE_MODE; + + /* + * For some hardware types, DSIM_MFLUSH_VS bit needs to be + * enabled explicitly. + */ + if (dsi->plat_data->hw_type == DSIM_TYPE_EXYNOS7870) + reg |= DSIM_MFLUSH_VS; } if (dsi->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET) -- 2.53.0