From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D34C71DE4CC; Tue, 8 Oct 2024 12:53:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728392018; cv=none; b=VWdkIo66YYSWmt+srxGbLZCq+MRM9+BCw4A0yoikuhgO5VEbp5cTf1c6JIQccAyknQHnm9vR1jCd/v3i8+DyZmJqDenHRWu+xqVzDrdm7K9+FZuuxNXSL+ryxN4DEhOqo7IEyqoQRyYFMfGuOZsQw/8Vv8SvDyKEXVrmn+fJRfA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728392018; c=relaxed/simple; bh=K5iRI8sBmPog/67WUZJpNUNIURUGjsr0iI8mcRk6PMc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IhM5E78NG15u9RaIyr1QYRHfeR0JheqnYqtGflYk5lyrE4SLdAstQ+jhGieFMis66pisRGiHTcG2/859VIa7TIAc0qWAlCDfxwpSHGakJHMmKBW6m1gXXTxbGrCa6Tu4j1v+8UOtm6IQ9FIhiM5q15IPzZOTmmBRsu+5MDbwMDQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fhV9jSug; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fhV9jSug" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 53049C4CEC7; Tue, 8 Oct 2024 12:53:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728392018; bh=K5iRI8sBmPog/67WUZJpNUNIURUGjsr0iI8mcRk6PMc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fhV9jSugScOHMUVZQIyrN4rKEKXxEgmxDeTl0lqm9nYJ8NxW0bX+8w/DdIQWdMTDR 4EoVGYG6hCTgFJ+ulLyJ+yKpL0Mc0CWgLDc5KIiYZC1IsehZgOGbM55szyAWccf3q0 9Xb32nxEGNqLreCLv3bvFUCE6HP5TOGZhOZCe6Og= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Charlene Liu , "Ahmed, Muhammad" , Zaeem Mohamed , Daniel Wheeler , Alex Deucher , Sasha Levin Subject: [PATCH 6.11 292/558] drm/amd/display: guard write a 0 post_divider value to HW Date: Tue, 8 Oct 2024 14:05:22 +0200 Message-ID: <20241008115713.814380363@linuxfoundation.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241008115702.214071228@linuxfoundation.org> References: <20241008115702.214071228@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.11-stable review patch. If anyone has any objections, please let me know. ------------------ 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