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drm/amd/display: Add callbacks for DMUB HPD IRQ notifications

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[Why]
We need HPD IRQ notifications (RX, short pulse) to properly handle
DP MST for DPIA connections.

[How]
A null pointer exception currently occurs when these are received
so add a check to validate that we have a handler installed for
the notification.

Extend the HPD handler to also handle HPD IRQ (RX) since the logic is
the same.

Fixes: e27c41d5b0 ("drm/amd/display: Support for DMUB HPD interrupt handling")

Reviewed-by: Wayne Lin <Wayne.Lin@amd.com>
Reviewed-by: Jude Shih <shenshih@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2021-11-04 16:52:07 -04:00 committed by Alex Deucher
parent d82b3266ef
commit c40a09e56f
1 changed files with 15 additions and 2 deletions
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17
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View file

@ -217,6 +217,7 @@ static const struct drm_format_info *
amd_get_format_info(const struct drm_mode_fb_cmd2 *cmd);
static void handle_hpd_irq_helper(struct amdgpu_dm_connector *aconnector);
static void handle_hpd_rx_irq(void *param);
static bool
is_timing_unchanged_for_freesync(struct drm_crtc_state *old_crtc_state,
@ -683,8 +684,12 @@ void dmub_hpd_callback(struct amdgpu_device *adev, struct dmub_notification *not
}
drm_connector_list_iter_end(&iter);
if (hpd_aconnector)
handle_hpd_irq_helper(hpd_aconnector);
if (hpd_aconnector) {
if (notify->type == DMUB_NOTIFICATION_HPD)
handle_hpd_irq_helper(hpd_aconnector);
else if (notify->type == DMUB_NOTIFICATION_HPD_IRQ)
handle_hpd_rx_irq(hpd_aconnector);
}
}
/**
@ -760,6 +765,10 @@ static void dm_dmub_outbox1_low_irq(void *interrupt_params)
DRM_ERROR("DM: notify type %d invalid!", notify.type);
continue;
}
if (!dm->dmub_callback[notify.type]) {
DRM_DEBUG_DRIVER("DMUB notification skipped, no handler: type=%d\n", notify.type);
continue;
}
if (dm->dmub_thread_offload[notify.type] == true) {
dmub_hpd_wrk = kzalloc(sizeof(*dmub_hpd_wrk), GFP_ATOMIC);
if (!dmub_hpd_wrk) {
@ -1560,6 +1569,10 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
DRM_ERROR("amdgpu: fail to register dmub hpd callback");
goto error;
}
if (!register_dmub_notify_callback(adev, DMUB_NOTIFICATION_HPD_IRQ, dmub_hpd_callback, true)) {
DRM_ERROR("amdgpu: fail to register dmub hpd callback");
goto error;
}
#endif /* CONFIG_DRM_AMD_DC_DCN */
}