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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 415D2C43461 for ; Mon, 3 May 2021 16:42:48 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 009656142F for ; Mon, 3 May 2021 16:42:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 009656142F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 349B86E9C4; Mon, 3 May 2021 16:42:47 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id C109C6E9C3; Mon, 3 May 2021 16:42:45 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 55B9061945; Mon, 3 May 2021 16:42:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620060165; bh=qmsD5qUUJyw98XkWtIT0ula+AfFy+NCvsgRg8vdj1+E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FlZAJ7R1MnDu0WzmyL8bpwMWxjlt0FfG2/8JELfXSqwnhkvGB3lBxSpGZFpENDvWs 0JUT05im+j3hVda4Kjb/PguhOXBY0bx8wuU9Ivba2nAP4Ll8xSzy+RNFpYsY3ASC+K xQZYfTPhahx6O9CwYdT+UJM5KeE8A2r/bwgZ80fqpK9QljHFUYOQMGFUb2X6WeklTD dQgz6ICn/84HeAzL0xBlMMBRVvGGkZcCzS67iz5TyRBfJ7Xs2FXs8vgiQXIB/AW8oB fXLrbf8jxZHylMIK12LkOMAniz6Dggs1EUyQGeCZGY/G8i+bzIDXN7SykDkw9gyKg3 1C2riOM/C/YdA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 27/31] drm/msm/mdp5: Configure PP_SYNC_HEIGHT to double the vtotal Date: Mon, 3 May 2021 12:42:00 -0400 Message-Id: <20210503164204.2854178-27-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210503164204.2854178-1-sashal@kernel.org> References: <20210503164204.2854178-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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: , Cc: Rob Clark , Sasha Levin , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, AngeloGioacchino Del Regno , Marijn Suijten , freedreno@lists.freedesktop.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Marijn Suijten [ Upstream commit 2ad52bdb220de5ab348098e3482b01235d15a842 ] Leaving this at a close-to-maximum register value 0xFFF0 means it takes very long for the MDSS to generate a software vsync interrupt when the hardware TE interrupt doesn't arrive. Configuring this to double the vtotal (like some downstream kernels) leads to a frame to take at most twice before the vsync signal, until hardware TE comes up. In this case the hardware interrupt responsible for providing this signal - "disp-te" gpio - is not hooked up to the mdp5 vsync/pp logic at all. This solves severe panel update issues observed on at least the Xperia Loire and Tone series, until said gpio is properly hooked up to an irq. Suggested-by: AngeloGioacchino Del Regno Signed-off-by: Marijn Suijten Reviewed-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20210406214726.131534-2-marijn.suijten@somainline.org Signed-off-by: Rob Clark Signed-off-by: Sasha Levin --- drivers/gpu/drm/msm/mdp/mdp5/mdp5_cmd_encoder.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cmd_encoder.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cmd_encoder.c index 60790df91bfa..397e71481129 100644 --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cmd_encoder.c +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cmd_encoder.c @@ -78,9 +78,17 @@ static int pingpong_tearcheck_setup(struct drm_encoder *encoder, | MDP5_PP_SYNC_CONFIG_VSYNC_IN_EN; cfg |= MDP5_PP_SYNC_CONFIG_VSYNC_COUNT(vclks_line); + /* + * Tearcheck emits a blanking signal every vclks_line * vtotal * 2 ticks on + * the vsync_clk equating to roughly half the desired panel refresh rate. + * This is only necessary as stability fallback if interrupts from the + * panel arrive too late or not at all, but is currently used by default + * because these panel interrupts are not wired up yet. + */ mdp5_write(mdp5_kms, REG_MDP5_PP_SYNC_CONFIG_VSYNC(pp_id), cfg); mdp5_write(mdp5_kms, - REG_MDP5_PP_SYNC_CONFIG_HEIGHT(pp_id), 0xfff0); + REG_MDP5_PP_SYNC_CONFIG_HEIGHT(pp_id), (2 * mode->vtotal)); + mdp5_write(mdp5_kms, REG_MDP5_PP_VSYNC_INIT_VAL(pp_id), mode->vdisplay); mdp5_write(mdp5_kms, REG_MDP5_PP_RD_PTR_IRQ(pp_id), mode->vdisplay + 1); -- 2.30.2 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel