Merge tag 'drm-misc-fixes-2022-10-27' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

drm-misc-fixes for v6.1-rc3:
- Fix HPD on bridge/ps8640.
- Stop leaking fences when killing a sched entity.
- Avoid uninitialized read in aperture_remove_conflicting_pci_device()

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ed24cbd2-2bcb-d2c2-46ed-9d8ea9615879@linux.intel.com

3 files changed, 29 insertions, 7 deletions

diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index d7483c13c569..083337a27966 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -105,6 +105,7 @@ struct ps8640 {
 	struct gpio_desc *gpio_powerdown;
 	struct device_link *link;
 	bool pre_enabled;
+	bool need_post_hpd_delay;
 };
 
 static const struct regmap_config ps8640_regmap_config[] = {
@@ -173,14 +174,31 @@ static int _ps8640_wait_hpd_asserted(struct ps8640 *ps_bridge, unsigned long wai
 {
 	struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL];
 	int status;
+	int ret;
 
 	/*
 	 * Apparently something about the firmware in the chip signals that
 	 * HPD goes high by reporting GPIO9 as high (even though HPD isn't
 	 * actually connected to GPIO9).
 	 */
-	return regmap_read_poll_timeout(map, PAGE2_GPIO_H, status,
-					status & PS_GPIO9, wait_us / 10, wait_us);
+	ret = regmap_read_poll_timeout(map, PAGE2_GPIO_H, status,
+				       status & PS_GPIO9, wait_us / 10, wait_us);
+
+	/*
+	 * The first time we see HPD go high after a reset we delay an extra
+	 * 50 ms. The best guess is that the MCU is doing "stuff" during this
+	 * time (maybe talking to the panel) and we don't want to interrupt it.
+	 *
+	 * No locking is done around "need_post_hpd_delay". If we're here we
+	 * know we're holding a PM Runtime reference and the only other place
+	 * that touches this is PM Runtime resume.
+	 */
+	if (!ret && ps_bridge->need_post_hpd_delay) {
+		ps_bridge->need_post_hpd_delay = false;
+		msleep(50);
+	}
+
+	return ret;
 }
 
 static int ps8640_wait_hpd_asserted(struct drm_dp_aux *aux, unsigned long wait_us)
@@ -381,6 +399,9 @@ static int __maybe_unused ps8640_resume(struct device *dev)
 	msleep(50);
 	gpiod_set_value(ps_bridge->gpio_reset, 0);
 
+	/* We just reset things, so we need a delay after the first HPD */
+	ps_bridge->need_post_hpd_delay = true;
+
 	/*
 	 * Mystery 200 ms delay for the "MCU to be ready". It's unclear if
 	 * this is truly necessary since the MCU will already signal that
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 6137537aaea4..4b913dbb7d7b 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -207,6 +207,7 @@ static void drm_sched_entity_kill_jobs_cb(struct dma_fence *f,
 	struct drm_sched_job *job = container_of(cb, struct drm_sched_job,
 						 finish_cb);
 
+	dma_fence_put(f);
 	INIT_WORK(&job->work, drm_sched_entity_kill_jobs_work);
 	schedule_work(&job->work);
 }
@@ -234,8 +235,10 @@ static void drm_sched_entity_kill_jobs(struct drm_sched_entity *entity)
 		struct drm_sched_fence *s_fence = job->s_fence;
 
 		/* Wait for all dependencies to avoid data corruptions */
-		while ((f = drm_sched_job_dependency(job, entity)))
+		while ((f = drm_sched_job_dependency(job, entity))) {
 			dma_fence_wait(f, false);
+			dma_fence_put(f);
+		}
 
 		drm_sched_fence_scheduled(s_fence);
 		dma_fence_set_error(&s_fence->finished, -ESRCH);
@@ -250,6 +253,7 @@ static void drm_sched_entity_kill_jobs(struct drm_sched_entity *entity)
 			continue;
 		}
 
+		dma_fence_get(entity->last_scheduled);
 		r = dma_fence_add_callback(entity->last_scheduled,
 					   &job->finish_cb,
 					   drm_sched_entity_kill_jobs_cb);
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c
index 9e6bcc03a1a4..41e77de1ea82 100644
--- a/drivers/video/aperture.c
+++ b/drivers/video/aperture.c
@@ -340,12 +340,9 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na
 		size = pci_resource_len(pdev, bar);
 		ret = aperture_remove_conflicting_devices(base, size, primary, name);
 		if (ret)
-			break;
+			return ret;
 	}
 
-	if (ret)
-		return ret;
-
 	/*
 	 * WARNING: Apparently we must kick fbdev drivers before vgacon,
 	 * otherwise the vga fbdev driver falls over.