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drm/amd/display: Don't use fsleep for PSR exit waits

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[ Upstream commit 79df45dc4b ]

[Why]
These functions can be called from high IRQ levels and the OS will hang
if it tries to use a usleep_highres or a msleep.

[How]
Replace the fsleep with a udelay.

Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nicholas Kazlauskas 2023-09-27 15:06:41 -04:00 committed by Greg Kroah-Hartman
parent ffc253263a
commit 2a79e92f23
2 changed files with 4 additions and 2 deletions
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3
drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c
View file

@ -586,7 +586,8 @@ static void dcn10_dmcu_set_psr_enable(struct dmcu *dmcu, bool enable, bool wait)
if (state == PSR_STATE0)
break;
}
fsleep(500);
/* must *not* be fsleep - this can be called from high irq levels */
udelay(500);
}
/* assert if max retry hit */

3
drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c
View file

@ -216,7 +216,8 @@ static void dmub_psr_enable(struct dmub_psr *dmub, bool enable, bool wait, uint8
break;
}
fsleep(500);
/* must *not* be fsleep - this can be called from high irq levels */
udelay(500);
}
/* assert if max retry hit */