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 D6FD75F54E; Tue, 13 Feb 2024 17:28:10 +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=1707845290; cv=none; b=iiV8vi+KSgqunjY/N3swk7vXw7rZuwW0HkMZj2CKwiXTtu07dksSgaT/rGEuQcXU17QEkksz5+DPUcnj+GDlGxOAH5mnzoPcnU8ZjptGCaBtx5PLmiO26Tbn+IBoYLuuFwauABiuUNnEFRmcMDnCXtckRhiGXZhvjeP6/0dbu6Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707845290; c=relaxed/simple; bh=vST47Lg784gNDJYF3VAgSCFPUfRgoAhJOLhq2TkRXrM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cA/soMA/AlCtEBXhxzwI6ve3skP9z7B/5WKHGlJZ6s5RWUc1/Yj5zxssRrbR7kd3QHfVbnlUKPsj0qZIzhI5K5gCrceVg6hsXSAVwiJHxZxcB2sX4iiplLvhs9yP1+LY4PrshFdYGyEXFNterHGmIN5Wsb7JZ6eWUhB2cfgPo8A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EukAMN3D; 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="EukAMN3D" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FEE3C433F1; Tue, 13 Feb 2024 17:28:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1707845290; bh=vST47Lg784gNDJYF3VAgSCFPUfRgoAhJOLhq2TkRXrM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EukAMN3DUpcmA1mcjjf8mupQqTDhuOTSFSv90fYs1ECnr13TpWotvPcfRIUADoQ6w LxDXAHHkqJTo0DgzhgjF7uM3sVsrY4q0tTqCJRls51iBjnTn/2h/VBYm3pveIO9G5j UFf3xOsOEqAnVQFHJdnpVfkoOja9tlek190j2mP4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kuogee Hsieh , Abhinav Kumar , Dmitry Baryshkov , Sasha Levin Subject: [PATCH 6.6 038/121] drm/msms/dp: fixed link clock divider bits be over written in BPC unknown case Date: Tue, 13 Feb 2024 18:20:47 +0100 Message-ID: <20240213171854.112022152@linuxfoundation.org> X-Mailer: git-send-email 2.43.1 In-Reply-To: <20240213171852.948844634@linuxfoundation.org> References: <20240213171852.948844634@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kuogee Hsieh [ Upstream commit 77e8aad5519e04f6c1e132aaec1c5f8faf41844f ] Since the value of DP_TEST_BIT_DEPTH_8 is already left shifted, in the BPC unknown case, the additional shift causes spill over to the other bits of the [DP_CONFIGURATION_CTRL] register. Fix this by changing the return value of dp_link_get_test_bits_depth() in the BPC unknown case to (DP_TEST_BIT_DEPTH_8 >> DP_TEST_BIT_DEPTH_SHIFT). Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Signed-off-by: Kuogee Hsieh Reviewed-by: Abhinav Kumar Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/573989/ Link: https://lore.kernel.org/r/1704917931-30133-1-git-send-email-quic_khsieh@quicinc.com [quic_abhinavk@quicinc.com: fix minor checkpatch warning to align with opening braces] Signed-off-by: Abhinav Kumar Signed-off-by: Sasha Levin --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 5 ----- drivers/gpu/drm/msm/dp/dp_link.c | 10 +++++++--- 2 files changed, 7 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index 77a8d9366ed7..fb588fde298a 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -135,11 +135,6 @@ static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl) tbd = dp_link_get_test_bits_depth(ctrl->link, ctrl->panel->dp_mode.bpp); - if (tbd == DP_TEST_BIT_DEPTH_UNKNOWN) { - pr_debug("BIT_DEPTH not set. Configure default\n"); - tbd = DP_TEST_BIT_DEPTH_8; - } - config |= tbd << DP_CONFIGURATION_CTRL_BPC_SHIFT; /* Num of Lanes */ diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c index 6375daaeb98e..487867979557 100644 --- a/drivers/gpu/drm/msm/dp/dp_link.c +++ b/drivers/gpu/drm/msm/dp/dp_link.c @@ -1211,6 +1211,9 @@ void dp_link_reset_phy_params_vx_px(struct dp_link *dp_link) u32 dp_link_get_test_bits_depth(struct dp_link *dp_link, u32 bpp) { u32 tbd; + struct dp_link_private *link; + + link = container_of(dp_link, struct dp_link_private, dp_link); /* * Few simplistic rules and assumptions made here: @@ -1228,12 +1231,13 @@ u32 dp_link_get_test_bits_depth(struct dp_link *dp_link, u32 bpp) tbd = DP_TEST_BIT_DEPTH_10; break; default: - tbd = DP_TEST_BIT_DEPTH_UNKNOWN; + drm_dbg_dp(link->drm_dev, "bpp=%d not supported, use bpc=8\n", + bpp); + tbd = DP_TEST_BIT_DEPTH_8; break; } - if (tbd != DP_TEST_BIT_DEPTH_UNKNOWN) - tbd = (tbd >> DP_TEST_BIT_DEPTH_SHIFT); + tbd = (tbd >> DP_TEST_BIT_DEPTH_SHIFT); return tbd; } -- 2.43.0