Merge tag 'drm-fixes-2021-10-15-1' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "It has a few scattered msm and i915 fixes, a few core fixes and a
  mediatek feature revert.

  I've had to pick a bunch of patches into this, as the drm-misc-fixes
  tree had a bunch of vc4 patches I wasn't comfortable with sending to
  you at least as part of this, they were delayed due to your reverts.
  If it's really useful as fixes I'll do a separate pull.

  Summary:

  Core:
   - clamp fbdev size
   - edid cap blocks read to avoid out of bounds

  panel:
   - fix missing crc32 dependency

  msm:
   - Fix a new crash on dev file close if the dev file was opened when
     GPU is not loaded (such as missing fw in initrd)
   - Switch to single drm_sched_entity per priority level per drm_file
     to unbreak multi-context userspace
   - Serialize GMU access to fix GMU OOB errors
   - Various error path fixes
   - A couple integer overflow fixes
   - Fix mdp5 cursor plane WARNs

  i915:
   - Fix ACPI object leak
   - Fix context leak in user proto-context creation
   - Fix missing i915_sw_fence_fini call

  hyperv:
   - hide hw pointer

  nouveau:
   - fix engine selection bit

  r128:
   - fix UML build

  rcar-du:
   - unconncted LVDS regression fix

  mediatek:
   - revert CMDQ refinement patches"

* tag 'drm-fixes-2021-10-15-1' of git://anongit.freedesktop.org/drm/drm: (34 commits)
  drm/panel: olimex-lcd-olinuxino: select CRC32
  drm/r128: fix build for UML
  drm/nouveau/fifo: Reinstate the correct engine bit programming
  drm/hyperv: Fix double mouse pointers
  drm/fbdev: Clamp fbdev surface size if too large
  drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read
  drm/i915: Free the returned object of acpi_evaluate_dsm()
  drm/i915: Fix bug in user proto-context creation that leaked contexts
  drm: rcar-du: Don't create encoder for unconnected LVDS outputs
  drm/msm/dsi: fix off by one in dsi_bus_clk_enable error handling
  drm/msm/dsi: Fix an error code in msm_dsi_modeset_init()
  drm/msm/dsi: dsi_phy_14nm: Take ready-bit into account in poll_for_ready
  drm/msm/dsi/phy: fix clock names in 28nm_8960 phy
  drm/msm/dpu: Fix address of SM8150 PINGPONG5 IRQ register
  drm/msm: Do not run snapshot on non-DPU devices
  drm/msm/a3xx: fix error handling in a3xx_gpu_init()
  drm/msm/a4xx: fix error handling in a4xx_gpu_init()
  drm/msm: Fix null pointer dereference on pointer edp
  drm/msm/mdp5: fix cursor-related warnings
  drm/msm: Avoid potential overflow in timeout_to_jiffies()
  ...

3 files changed, 28 insertions, 4 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index 0daa8bba50f5..4bf4e25d7f01 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -86,12 +86,20 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 	}
 
 	/*
-	 * Create and initialize the encoder. On Gen3 skip the LVDS1 output if
+	 * Create and initialize the encoder. On Gen3, skip the LVDS1 output if
 	 * the LVDS1 encoder is used as a companion for LVDS0 in dual-link
-	 * mode.
+	 * mode, or any LVDS output if it isn't connected. The latter may happen
+	 * on D3 or E3 as the LVDS encoders are needed to provide the pixel
+	 * clock to the DU, even when the LVDS outputs are not used.
 	 */
-	if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {
-		if (rcar_lvds_dual_link(bridge))
+	if (rcdu->info->gen >= 3) {
+		if (output == RCAR_DU_OUTPUT_LVDS1 &&
+		    rcar_lvds_dual_link(bridge))
+			return -ENOLINK;
+
+		if ((output == RCAR_DU_OUTPUT_LVDS0 ||
+		     output == RCAR_DU_OUTPUT_LVDS1) &&
+		    !rcar_lvds_is_connected(bridge))
 			return -ENOLINK;
 	}
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index d061b8de748f..b672c5bd72ee 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -576,6 +576,9 @@ static int rcar_lvds_attach(struct drm_bridge *bridge,
 {
 	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
 
+	if (!lvds->next_bridge)
+		return 0;
+
 	return drm_bridge_attach(bridge->encoder, lvds->next_bridge, bridge,
 				 flags);
 }
@@ -598,6 +601,14 @@ bool rcar_lvds_dual_link(struct drm_bridge *bridge)
 }
 EXPORT_SYMBOL_GPL(rcar_lvds_dual_link);
 
+bool rcar_lvds_is_connected(struct drm_bridge *bridge)
+{
+	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
+
+	return lvds->next_bridge != NULL;
+}
+EXPORT_SYMBOL_GPL(rcar_lvds_is_connected);
+
 /* -----------------------------------------------------------------------------
  * Probe & Remove
  */
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.h b/drivers/gpu/drm/rcar-du/rcar_lvds.h
index 222ec0e60785..eb7c6ef03b00 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.h
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.h
@@ -16,6 +16,7 @@ struct drm_bridge;
 int rcar_lvds_clk_enable(struct drm_bridge *bridge, unsigned long freq);
 void rcar_lvds_clk_disable(struct drm_bridge *bridge);
 bool rcar_lvds_dual_link(struct drm_bridge *bridge);
+bool rcar_lvds_is_connected(struct drm_bridge *bridge);
 #else
 static inline int rcar_lvds_clk_enable(struct drm_bridge *bridge,
 				       unsigned long freq)
@@ -27,6 +28,10 @@ static inline bool rcar_lvds_dual_link(struct drm_bridge *bridge)
 {
 	return false;
 }
+static inline bool rcar_lvds_is_connected(struct drm_bridge *bridge)
+{
+	return false;
+}
 #endif /* CONFIG_DRM_RCAR_LVDS */
 
 #endif /* __RCAR_LVDS_H__ */