drm/msm/dsi: drop the hpd worker

It makes no sense to have the HPD worker in the MSM DSI driver anymore.
It is only queued from the dsi_host_attach/detach() callbacks, where
it plays no useful role. Either way the panel or next bridge will be
present and will report it's status directly.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/498740/
Link: https://lore.kernel.org/r/20220822174417.292926-1-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -144,7 +144,6 @@ struct msm_dsi_host {
 
 	u32 err_work_state;
 	struct work_struct err_work;
-	struct work_struct hpd_work;
 	struct workqueue_struct *workqueue;
 
 	/* DSI 6G TX buffer*/
@@ -1427,14 +1426,6 @@ static int dsi_cmds2buf_tx(struct msm_dsi_host *msm_host,
 	return len;
 }
 
-static void dsi_hpd_worker(struct work_struct *work)
-{
-	struct msm_dsi_host *msm_host =
-		container_of(work, struct msm_dsi_host, hpd_work);
-
-	drm_helper_hpd_irq_event(msm_host->dev);
-}
-
 static void dsi_err_worker(struct work_struct *work)
 {
 	struct msm_dsi_host *msm_host =
@@ -1624,8 +1615,6 @@ static int dsi_host_attach(struct mipi_dsi_host *host,
 		return ret;
 
 	DBG("id=%d", msm_host->id);
-	if (msm_host->dev)
-		queue_work(msm_host->workqueue, &msm_host->hpd_work);
 
 	return 0;
 }
@@ -1640,8 +1629,6 @@ static int dsi_host_detach(struct mipi_dsi_host *host,
 	msm_host->device_node = NULL;
 
 	DBG("id=%d", msm_host->id);
-	if (msm_host->dev)
-		queue_work(msm_host->workqueue, &msm_host->hpd_work);
 
 	return 0;
 }
@@ -2055,7 +2042,6 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 	/* setup workqueue */
 	msm_host->workqueue = alloc_ordered_workqueue("dsi_drm_work", 0);
 	INIT_WORK(&msm_host->err_work, dsi_err_worker);
-	INIT_WORK(&msm_host->hpd_work, dsi_hpd_worker);
 
 	msm_dsi->id = msm_host->id;