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| author | Nirmoy Das <nirmoyd@nvidia.com> | 2025-09-29 11:50:10 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-10-02 13:42:55 +0200 |
| commit | 7ea47a560a7a3e7edc6d33dea9e141737a75d742 (patch) | |
| tree | d69a9401a017265a0b5a12e123e7810aa70f01d8 /drivers/gpu/drm/ast | |
| parent | ed6fa21f689737897b16d3d028930ffa842100f6 (diff) | |
| download | linux-7ea47a560a7a3e7edc6d33dea9e141737a75d742.tar.gz linux-7ea47a560a7a3e7edc6d33dea9e141737a75d742.tar.bz2 linux-7ea47a560a7a3e7edc6d33dea9e141737a75d742.zip | |
drm/ast: Use msleep instead of mdelay for edid read
[ Upstream commit c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 ]
The busy-waiting in `mdelay()` can cause CPU stalls and kernel timeouts
during boot.
Signed-off-by: Nirmoy Das <nirmoyd@nvidia.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Carol L Soto csoto@nvidia.com<mailto:csoto@nvidia.com>
Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port")
Cc: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v5.19+
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250917194346.2905522-1-nirmoyd@nvidia.com
[ Applied change to ast_astdp_read_edid() instead of ast_astdp_read_edid_block() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu/drm/ast')
| -rw-r--r-- | drivers/gpu/drm/ast/ast_dp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c index c6f226b6f081..fc9c36c8b81b 100644 --- a/drivers/gpu/drm/ast/ast_dp.c +++ b/drivers/gpu/drm/ast/ast_dp.c @@ -62,7 +62,7 @@ int ast_astdp_read_edid(struct drm_device *dev, u8 *ediddata) * of right-click of mouse. * 2. The Delays are often longer a lot when system resume from S3/S4. */ - mdelay(j+1); + msleep(j + 1); if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, ASTDP_MCU_FW_EXECUTING) && |