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 C752F1F946 for ; Fri, 21 Jul 2023 16:21:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35ACBC433C7; Fri, 21 Jul 2023 16:21:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689956481; bh=UII2P5ZiRNZLnw7FkIaiwmN4bJHlaHBJ8vKBSzDgufQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vEGp0ERd8ePsHpnAUIwqObX2lRoaV+9vE7sNFXGQOWykryA+Ld9rkCDlWpLG7z97c Sx4LKGAEzcePuxT6p9bHImqmAiONkqs/xhl7/EH0MwWh4vl+VjXFAznF5FbaR1GOVF fkAM2PfH/J98hABvOO/tFYAwU+m8REoow6jzgmSg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Rodrigo Siqueira , Aurabindo Pillai , Daniel Wheeler , Alex Deucher Subject: [PATCH 6.4 208/292] drm/amd/display: Add monitor specific edid quirk Date: Fri, 21 Jul 2023 18:05:17 +0200 Message-ID: <20230721160537.816611880@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230721160528.800311148@linuxfoundation.org> References: <20230721160528.800311148@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Aurabindo Pillai commit 613a7956deb3b1ffa2810c6d4c90ee9c3d743dbb upstream. Disable FAMS on a Samsung Odyssey G9 monitor. Experiments show that this monitor does not work well under some use cases, and is likely implementation specific bug on the monitor's firmware. Cc: stable@vger.kernel.org Reviewed-by: Rodrigo Siqueira Signed-off-by: Aurabindo Pillai Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 26 ++++++++++++++ 1 file changed, 26 insertions(+) --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c @@ -47,6 +47,30 @@ /* MST Dock */ static const uint8_t SYNAPTICS_DEVICE_ID[] = "SYNA"; +static u32 edid_extract_panel_id(struct edid *edid) +{ + return (u32)edid->mfg_id[0] << 24 | + (u32)edid->mfg_id[1] << 16 | + (u32)EDID_PRODUCT_ID(edid); +} + +static void apply_edid_quirks(struct edid *edid, struct dc_edid_caps *edid_caps) +{ + uint32_t panel_id = edid_extract_panel_id(edid); + + switch (panel_id) { + /* Workaround for some monitors which does not work well with FAMS */ + case drm_edid_encode_panel_id('S', 'A', 'M', 0x0E5E): + case drm_edid_encode_panel_id('S', 'A', 'M', 0x7053): + case drm_edid_encode_panel_id('S', 'A', 'M', 0x71AC): + DRM_DEBUG_DRIVER("Disabling FAMS on monitor with panel id %X\n", panel_id); + edid_caps->panel_patch.disable_fams = true; + break; + default: + return; + } +} + /* dm_helpers_parse_edid_caps * * Parse edid caps @@ -118,6 +142,8 @@ enum dc_edid_status dm_helpers_parse_edi else edid_caps->speaker_flags = DEFAULT_SPEAKER_LOCATION; + apply_edid_quirks(edid_buf, edid_caps); + kfree(sads); kfree(sadb);