6.6-stable review patch. If anyone has any objections, please let me know.
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From: George Shen george.shen@amd.com
[ 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 --- .../dc/link/protocols/link_dp_capability.c | 30 +++++++++---------- 1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c index 3d589072fe307..1e621eae9b7da 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c @@ -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; }