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drm/amd/display: Increase timeout threshold for DMCUB reset

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[Why]
If we're backdoor loading the DMCUB performs more work than just
the PHY reset so we can end up resetting before the cleanup has fully
finished.

[How]
Increase timeout, add udelay between spins to guarantee a minimum.

Reviewed-by: Roy Chan <roy.chan@amd.com>
Reviewed-by: Eric Yang <Eric.Yang2@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2021-08-03 12:03:10 -04:00 committed by Alex Deucher
parent 19c618e613
commit 314c7629e2
1 changed files with 5 additions and 5 deletions
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10
drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c
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@ -83,7 +83,7 @@ static inline void dmub_dcn31_translate_addr(const union dmub_addr *addr_in,
void dmub_dcn31_reset(struct dmub_srv *dmub)
{
union dmub_gpint_data_register cmd;
const uint32_t timeout = 30;
const uint32_t timeout = 100;
uint32_t in_reset, scratch, i;
REG_GET(DMCUB_CNTL2, DMCUB_SOFT_RESET, &in_reset);
@ -98,21 +98,21 @@ void dmub_dcn31_reset(struct dmub_srv *dmub)
/**
* Timeout covers both the ACK and the wait
* for remaining work to finish.
*
* This is mostly bound by the PHY disable sequence.
* Each register check will be greater than 1us, so
* don't bother using udelay.
*/
for (i = 0; i < timeout; ++i) {
if (dmub->hw_funcs.is_gpint_acked(dmub, cmd))
break;
udelay(1);
}
for (i = 0; i < timeout; ++i) {
scratch = dmub->hw_funcs.get_gpint_response(dmub);
if (scratch == DMUB_GPINT__STOP_FW_RESPONSE)
break;
udelay(1);
}
/* Force reset in case we timed out, DMCUB is likely hung. */