drm/amd/display: Avoid trying AUX transactions on disconnected ports

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

[Why & How]
Observe that we try to access DPCD 0x600h of disconnected DP ports.
In order not to wasting time on retrying these ports, call
dpcd_write_rx_power_ctrl() after checking its connection status.

Reviewed-by: Aurabindo Pillai <aurabindo.pillai@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>

authored by

Wayne Lin and committed by

Alex Deucher 1 year ago deb24e64 8ade4736

+2 -1

1 changed file

expand all

drivers

gpu

drm

amd

display

link

link_dpms.c

+2 -1

drivers/gpu/drm/amd/display/dc/link/link_dpms.c

··· 140 140 } 141 141 } 142 142 143 - if ((!link->wa_flags.dp_keep_receiver_powered) || hw_init) 143 + if (((!link->wa_flags.dp_keep_receiver_powered) || hw_init) && 144 + (link->type != dc_connection_none)) 144 145 dpcd_write_rx_power_ctrl(link, false); 145 146 } 146 147 }

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