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 A7E6918654 for ; Wed, 20 Sep 2023 11:47:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0E78C433C8; Wed, 20 Sep 2023 11:47:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695210442; bh=tv835qELQ2hvSyxjKfy7C3bCqi4hvz0PeA8FPF9X/BY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nK86r6D7uPdO1djWUUgzzF3ajbHQTZWhk7SeNIkmAR2yH/ZdK5W16Ne0uwEv8Iwbv Koee1i2AyN3TfhYCz4IRThfo5X0FZmUJko2OyDiF3P2IzkZyr/gAtYOScBW+zhXCrE qjZbo9KTc+HyCEwObcM/QKAxCxQB+SVYPSyaOA/Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alvin Lee , Tom Chung , Austin Zheng , Daniel Wheeler , Alex Deucher , Sasha Levin Subject: [PATCH 6.5 079/211] drm/amd/display: Use DTBCLK as refclk instead of DPREFCLK Date: Wed, 20 Sep 2023 13:28:43 +0200 Message-ID: <20230920112848.253849360@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112845.859868994@linuxfoundation.org> References: <20230920112845.859868994@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 6.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Austin Zheng [ Upstream commit 4a30cc2bd281fa176a68b5305cd3695d636152ad ] [Why] Flash of corruption observed when UCLK switching after transitioning from DTBCLK to DPREFCLK on subVP(DP) + subVP(HDMI) config Scenario where DPREFCLK is required instead of DTBCLK is not expected [How] Always set the DTBCLK source as DTBCLK0 Reviewed-by: Alvin Lee Acked-by: Tom Chung Signed-off-by: Austin Zheng Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c index 61ceff6bc0b19..921f58c0c729b 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c @@ -281,7 +281,8 @@ static void dccg32_set_dpstreamclk( struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg); /* set the dtbclk_p source */ - dccg32_set_dtbclk_p_src(dccg, src, otg_inst); + /* always program refclk as DTBCLK. No use-case expected to require DPREFCLK as refclk */ + dccg32_set_dtbclk_p_src(dccg, DTBCLK0, otg_inst); /* enabled to select one of the DTBCLKs for pipe */ switch (dp_hpo_inst) { -- 2.40.1