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drm/amd/display: Skip checking FRL_MODE bit for PCON BW determination

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[ Upstream commit 0584bbcf0c53c133081100e4f4c9fe41e598d045 ]

[Why/How]
Certain PCON will clear the FRL_MODE bit despite supporting the link BW
indicated in the other bits.

Thus, skip checking the FRL_MODE bit when interpreting the
hdmi_encoded_link_bw struct.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
George Shen
2025-02-14 22:00:13 -05:00
committed by Greg Kroah-Hartman
parent 3af9db7842
commit a7b8f0addf
1 changed files with 15 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
View File

@@ -239,21 +239,21 @@ static uint32_t intersect_frl_link_bw_support(
{
uint32_t supported_bw_in_kbps = max_supported_frl_bw_in_kbps;
// HDMI_ENCODED_LINK_BW bits are only valid if HDMI Link Configuration bit is 1 (FRL mode)
if (hdmi_encoded_link_bw.bits.FRL_MODE) {
if (hdmi_encoded_link_bw.bits.BW_48Gbps)
supported_bw_in_kbps = 48000000;
else if (hdmi_encoded_link_bw.bits.BW_40Gbps)
supported_bw_in_kbps = 40000000;
else if (hdmi_encoded_link_bw.bits.BW_32Gbps)
supported_bw_in_kbps = 32000000;
else if (hdmi_encoded_link_bw.bits.BW_24Gbps)
supported_bw_in_kbps = 24000000;
else if (hdmi_encoded_link_bw.bits.BW_18Gbps)
supported_bw_in_kbps = 18000000;
else if (hdmi_encoded_link_bw.bits.BW_9Gbps)
supported_bw_in_kbps = 9000000;
}
/* Skip checking FRL_MODE bit, as certain PCON will clear
* it despite supporting the link BW indicated in the other bits.
*/
if (hdmi_encoded_link_bw.bits.BW_48Gbps)
supported_bw_in_kbps = 48000000;
else if (hdmi_encoded_link_bw.bits.BW_40Gbps)
supported_bw_in_kbps = 40000000;
else if (hdmi_encoded_link_bw.bits.BW_32Gbps)
supported_bw_in_kbps = 32000000;
else if (hdmi_encoded_link_bw.bits.BW_24Gbps)
supported_bw_in_kbps = 24000000;
else if (hdmi_encoded_link_bw.bits.BW_18Gbps)
supported_bw_in_kbps = 18000000;
else if (hdmi_encoded_link_bw.bits.BW_9Gbps)
supported_bw_in_kbps = 9000000;
return supported_bw_in_kbps;
}