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 A4307C369D3 for ; Wed, 25 Sep 2024 11:52:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 54A3910E98C; Wed, 25 Sep 2024 11:52:36 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="lYKTZhpx"; dkim-atps=neutral Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gabe.freedesktop.org (Postfix) with ESMTPS id E3A4510E98C; Wed, 25 Sep 2024 11:52:35 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 4E6505C0E74; Wed, 25 Sep 2024 11:52:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 193D1C4CECE; Wed, 25 Sep 2024 11:52:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727265154; bh=nkBzYac0mtkWjR1R5qQ4U2a+voJyzBdEXgbdpDg+cEc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lYKTZhpxhmBm56ObhOz67uvUv0cdKp/u2X6cvApjT/8Ox9hn3LqVKpbzRAcpZ12pF gc7PcCvHq6ukqtY9R8dky10B8lSSlrQCXetPcml1aObdFOJRnb7RCfGK8T/rpJ5cjD kAwre2FBdK6//nGFw0fO+rmgbxVpbFQSDpm+xuofsMgOFPiVaUNPNTeHCBftVS7VxK 6LmEij3+t0xveq7DSs/RGo8oxTKwp+2y61grCu4f4VAe8eGiCdO/Iuqdf7wKbG433W sfu0qbuYK3L6KEdcKJfjmIbxQj5JqDw66nHtuK6+2Nu2MCy1UbSMJrxPZqALk1nNMP zPoKCHBBs7eEA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: "Ahmed, Muhammad" , Charlene Liu , Ahmed@freedesktop.org, Zaeem Mohamed , Daniel Wheeler , Alex Deucher , Sasha Levin , harry.wentland@amd.com, sunpeng.li@amd.com, Rodrigo.Siqueira@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, daniel.miess@amd.com, wayne.lin@amd.com, nicholas.kazlauskas@amd.com, yi-lchen@amd.com, alex.hung@amd.com, ilya.bakoulin@amd.com, harikrishna.revalla@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.11 220/244] drm/amd/display: guard write a 0 post_divider value to HW Date: Wed, 25 Sep 2024 07:27:21 -0400 Message-ID: <20240925113641.1297102-220-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240925113641.1297102-1-sashal@kernel.org> References: <20240925113641.1297102-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.11 Content-Transfer-Encoding: 8bit X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: "Ahmed, Muhammad" [ Upstream commit 5d666496c24129edeb2bcb500498b87cc64e7f07 ] [why] post_divider_value should not be 0. Reviewed-by: Charlene Liu Signed-off-by: Ahmed, Muhammad Signed-off-by: Zaeem Mohamed Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c b/drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c index 68cd3258f4a97..a64d8f3ec93a3 100644 --- a/drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c +++ b/drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c @@ -47,7 +47,8 @@ static void dccg35_trigger_dio_fifo_resync(struct dccg *dccg) uint32_t dispclk_rdivider_value = 0; REG_GET(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_RDIVIDER, &dispclk_rdivider_value); - REG_UPDATE(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_WDIVIDER, dispclk_rdivider_value); + if (dispclk_rdivider_value != 0) + REG_UPDATE(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_WDIVIDER, dispclk_rdivider_value); } static void dcn35_set_dppclk_enable(struct dccg *dccg, -- 2.43.0