Mario Limonciello (AMD) a45450c36e drm/amd/display: Move sleep into each retry for retrieve_link_cap() ...

commit 71ad9054c1 upstream.

[Why]
When a monitor is booting it's possible that it isn't ready to retrieve
link caps and this can lead to an EDID read failure:

```
[drm:retrieve_link_cap [amdgpu]] *ERROR* retrieve_link_cap: Read receiver caps dpcd data failed.
amdgpu 0000:c5:00.0: [drm] *ERROR* No EDID read.
```

[How]
Rather than msleep once and try a few times, msleep each time.  Should
be no changes for existing working monitors, but should correct reading
caps on a monitor that is slow to boot.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4672
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 669dca37b3)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-12-01 11:43:28 +01:00

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link_ddc.c

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link_ddc.h

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link_dp_capability.c

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link_dp_capability.h

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link_dp_dpia_bw.c

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link_dp_dpia_bw.h

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link_dp_dpia.c

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link_dp_dpia.h

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link_dp_irq_handler.c

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link_dp_irq_handler.h

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link_dp_phy.c

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link_dp_phy.h

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link_dp_training_8b_10b.c

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link_dp_training_8b_10b.h

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link_dp_training_128b_132b.c

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link_dp_training_128b_132b.h

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link_dp_training_auxless.c

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link_dp_training_auxless.h

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link_dp_training_dpia.c

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link_dp_training_dpia.h

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link_dp_training_fixed_vs_pe_retimer.c

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link_dp_training_fixed_vs_pe_retimer.h

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link_dp_training.c

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link_dp_training.h

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link_dpcd.c

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link_dpcd.h

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link_edp_panel_control.c

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link_edp_panel_control.h

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link_hpd.c

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link_hpd.h

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