linux-kernel - [PATCH] drm/amd/display: replace use of msleep(<20) with usleep

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Message-ID: <20250326070054.68355-1-bold.zone2373@fastmail.com>
Date: Wed, 26 Mar 2025 00:00:10 -0700
From: James Flowers <bold.zone2373@...tmail.com>
To: harry.wentland@....com,
	sunpeng.li@....com,
	siqueira@...lia.com,
	alexander.deucher@....com,
	christian.koenig@....com,
	airlied@...il.com,
	simona@...ll.ch,
	aurabindo.pillai@....com,
	alex.hung@....com,
	skhan@...uxfoundation.org
Cc: James Flowers <bold.zone2373@...tmail.com>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel-mentees@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amd/display: replace use of msleep(<20) with usleep_range for better accuracy

msleep < 20ms will often sleep for ~20ms (according to Documentation/timers/timers-howto.rst).

Signed-off-by: James Flowers <bold.zone2373@...tmail.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 2cd35392e2da..2d225735602b 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -682,7 +682,7 @@ static bool execute_synaptics_rc_command(struct drm_dp_aux *aux,
 		if (rc_cmd == cmd)
 			// active is 0
 			break;
-		msleep(10);
+		usleep_range(10000, 10200);
 	}
 
 	// read rc result
-- 
2.49.0