Merge tag 'topic/drm-misc-2016-05-13' of git://anongit.freedesktop.org/drm-intel into drm-next

I kinda hoped that I could still sneak in Noralf's
drm_simple_display_pipe, since there's intereset by others now (for tilcdc
at least). But it wasn't ready by a hair. Oh well.

Otherwise random stuff plus prep patches from Noralf.

* tag 'topic/drm-misc-2016-05-13' of git://anongit.freedesktop.org/drm-intel:
  drm/atomic: Add drm_atomic_helper_best_encoder()
  drm/atomic: Don't skip drm_bridge_*() calls if !drm_encoder_helper_funcs
  drm/fb-cma-helper: Hook up to DocBook and fix some docs
  drm/fb-helper: Remove mention of CONFIG_FB_DEFERRED_IO in docs
  drm/sti: include linux/seq_file.h where needed
  drm/tegra: Use lockless gem BO free callback
  drm/exynos: Use lockless gem BO free callback
  drm: Make drm_encoder_helper_funcs optional

Documentation/DocBook/gpu.tmpl

@@ -1615,6 +1615,11 @@ void intel_crt_init(struct drm_device *dev)
 !Pdrivers/gpu/drm/drm_fb_helper.c fbdev helpers
 !Edrivers/gpu/drm/drm_fb_helper.c
 !Iinclude/drm/drm_fb_helper.h
+    </sect2>
+    <sect2>
+      <title>Framebuffer CMA Helper Functions Reference</title>
+!Pdrivers/gpu/drm/drm_fb_cma_helper.c framebuffer cma helper functions
+!Edrivers/gpu/drm/drm_fb_cma_helper.c
     </sect2>
     <sect2>
       <title>Display Port Helper Functions Reference</title>

drivers/gpu/drm/drm_atomic_helper.c

@@ -384,8 +384,6 @@ mode_fixup(struct drm_atomic_state *state)
 		 */
 		encoder = conn_state->best_encoder;
 		funcs = encoder->helper_private;
-		if (!funcs)
-			continue;
 
 		ret = drm_bridge_mode_fixup(encoder->bridge, &crtc_state->mode,
 				&crtc_state->adjusted_mode);
@@ -394,7 +392,7 @@ mode_fixup(struct drm_atomic_state *state)
 			return -EINVAL;
 		}
 
-		if (funcs->atomic_check) {
+		if (funcs && funcs->atomic_check) {
 			ret = funcs->atomic_check(encoder, crtc_state,
 						  conn_state);
 			if (ret) {
@@ -402,7 +400,7 @@ mode_fixup(struct drm_atomic_state *state)
 						 encoder->base.id, encoder->name);
 				return ret;
 			}
-		} else if (funcs->mode_fixup) {
+		} else if (funcs && funcs->mode_fixup) {
 			ret = funcs->mode_fixup(encoder, &crtc_state->mode,
 						&crtc_state->adjusted_mode);
 			if (!ret) {
@@ -707,12 +705,14 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 		drm_bridge_disable(encoder->bridge);
 
 		/* Right function depends upon target state. */
-		if (connector->state->crtc && funcs->prepare)
-			funcs->prepare(encoder);
-		else if (funcs->disable)
-			funcs->disable(encoder);
-		else
-			funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
+		if (funcs) {
+			if (connector->state->crtc && funcs->prepare)
+				funcs->prepare(encoder);
+			else if (funcs->disable)
+				funcs->disable(encoder);
+			else if (funcs->dpms)
+				funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
+		}
 
 		drm_bridge_post_disable(encoder->bridge);
 	}
@@ -873,7 +873,7 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
 		 * Each encoder has at most one connector (since we always steal
 		 * it away), so we won't call mode_set hooks twice.
 		 */
-		if (funcs->mode_set)
+		if (funcs && funcs->mode_set)
 			funcs->mode_set(encoder, mode, adjusted_mode);
 
 		drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
@@ -974,10 +974,12 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 		 */
 		drm_bridge_pre_enable(encoder->bridge);
 
-		if (funcs->enable)
-			funcs->enable(encoder);
-		else
-			funcs->commit(encoder);
+		if (funcs) {
+			if (funcs->enable)
+				funcs->enable(encoder);
+			else if (funcs->commit)
+				funcs->commit(encoder);
+		}
 
 		drm_bridge_enable(encoder->bridge);
 	}
@@ -2480,6 +2482,23 @@ backoff:
 }
 EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
 
+/**
+ * drm_atomic_helper_best_encoder - Helper for &drm_connector_helper_funcs
+ *                                  ->best_encoder callback
+ * @connector: Connector control structure
+ *
+ * This is a &drm_connector_helper_funcs ->best_encoder callback helper for
+ * connectors that support exactly 1 encoder, statically determined at driver
+ * init time.
+ */
+struct drm_encoder *
+drm_atomic_helper_best_encoder(struct drm_connector *connector)
+{
+	WARN_ON(connector->encoder_ids[1]);
+	return drm_encoder_find(connector->dev, connector->encoder_ids[0]);
+}
+EXPORT_SYMBOL(drm_atomic_helper_best_encoder);
+
 /**
  * DOC: atomic state reset and initialization
  *

drivers/gpu/drm/drm_crtc_helper.c

@@ -170,11 +170,14 @@ drm_encoder_disable(struct drm_encoder *encoder)
 {
 	const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 
+	if (!encoder_funcs)
+		return;
+
 	drm_bridge_disable(encoder->bridge);
 
 	if (encoder_funcs->disable)
 		(*encoder_funcs->disable)(encoder);
-	else
+	else if (encoder_funcs->dpms)
 		(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
 
 	drm_bridge_post_disable(encoder->bridge);
@@ -248,6 +251,9 @@ drm_crtc_prepare_encoders(struct drm_device *dev)
 
 	drm_for_each_encoder(encoder, dev) {
 		encoder_funcs = encoder->helper_private;
+		if (!encoder_funcs)
+			continue;
+
 		/* Disable unused encoders */
 		if (encoder->crtc == NULL)
 			drm_encoder_disable(encoder);
@@ -326,6 +332,10 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (encoder->crtc != crtc)
 			continue;
 
+		encoder_funcs = encoder->helper_private;
+		if (!encoder_funcs)
+			continue;
+
 		ret = drm_bridge_mode_fixup(encoder->bridge,
 			mode, adjusted_mode);
 		if (!ret) {
@@ -360,11 +370,15 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (encoder->crtc != crtc)
 			continue;
 
+		encoder_funcs = encoder->helper_private;
+		if (!encoder_funcs)
+			continue;
+
 		drm_bridge_disable(encoder->bridge);
 
-		encoder_funcs = encoder->helper_private;
 		/* Disable the encoders as the first thing we do. */
-		encoder_funcs->prepare(encoder);
+		if (encoder_funcs->prepare)
+			encoder_funcs->prepare(encoder);
 
 		drm_bridge_post_disable(encoder->bridge);
 	}
@@ -385,11 +399,15 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (encoder->crtc != crtc)
 			continue;
 
+		encoder_funcs = encoder->helper_private;
+		if (!encoder_funcs)
+			continue;
+
 		DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
 			encoder->base.id, encoder->name,
 			mode->base.id, mode->name);
-		encoder_funcs = encoder->helper_private;
-		encoder_funcs->mode_set(encoder, mode, adjusted_mode);
+		if (encoder_funcs->mode_set)
+			encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 
 		drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
 	}
@@ -402,10 +420,14 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		if (encoder->crtc != crtc)
 			continue;
 
+		encoder_funcs = encoder->helper_private;
+		if (!encoder_funcs)
+			continue;
+
 		drm_bridge_pre_enable(encoder->bridge);
 
-		encoder_funcs = encoder->helper_private;
-		encoder_funcs->commit(encoder);
+		if (encoder_funcs->commit)
+			encoder_funcs->commit(encoder);
 
 		drm_bridge_enable(encoder->bridge);
 	}
@@ -790,12 +812,15 @@ static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 	struct drm_bridge *bridge = encoder->bridge;
 	const struct drm_encoder_helper_funcs *encoder_funcs;
 
+	encoder_funcs = encoder->helper_private;
+	if (!encoder_funcs)
+		return;
+
 	if (mode == DRM_MODE_DPMS_ON)
 		drm_bridge_pre_enable(bridge);
 	else
 		drm_bridge_disable(bridge);
 
-	encoder_funcs = encoder->helper_private;
 	if (encoder_funcs->dpms)
 		encoder_funcs->dpms(encoder, mode);
 

drivers/gpu/drm/drm_fb_cma_helper.c

@@ -43,14 +43,12 @@ struct drm_fbdev_cma {
  * Provides helper functions for creating a cma (contiguous memory allocator)
  * backed framebuffer.
  *
- * drm_fb_cma_create() is used in the
- * (struct drm_mode_config_funcs *)->fb_create callback function to create the
- * cma backed framebuffer.
+ * drm_fb_cma_create() is used in the &drm_mode_config_funcs ->fb_create
+ * callback function to create a cma backed framebuffer.
  *
  * An fbdev framebuffer backed by cma is also available by calling
  * drm_fbdev_cma_init(). drm_fbdev_cma_fini() tears it down.
- * If CONFIG_FB_DEFERRED_IO is enabled and the callback
- * (struct drm_framebuffer_funcs)->dirty is set, fb_deferred_io
+ * If the &drm_framebuffer_funcs ->dirty callback is set, fb_deferred_io
  * will be set up automatically. dirty() is called by
  * drm_fb_helper_deferred_io() in process context (struct delayed_work).
  *

drivers/gpu/drm/drm_fb_helper.c

@@ -85,14 +85,14 @@ static LIST_HEAD(kernel_fb_helper_list);
  * should call drm_fb_helper_single_add_all_connectors() followed by
  * drm_fb_helper_initial_config().
  *
- * If CONFIG_FB_DEFERRED_IO is enabled and &drm_framebuffer_funcs ->dirty is
- * set, the drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit}
- * functions will accumulate changes and schedule &fb_helper .dirty_work to run
- * right away. This worker then calls the dirty() function ensuring that it
- * will always run in process context since the fb_*() function could be
- * running in atomic context. If drm_fb_helper_deferred_io() is used as the
- * deferred_io callback it will also schedule dirty_work with the damage
- * collected from the mmap page writes.
+ * If &drm_framebuffer_funcs ->dirty is set, the
+ * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
+ * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right
+ * away. This worker then calls the dirty() function ensuring that it will
+ * always run in process context since the fb_*() function could be running in
+ * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
+ * callback it will also schedule dirty_work with the damage collected from the
+ * mmap page writes.
  */
 
 /**

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -418,7 +418,7 @@ static struct drm_driver exynos_drm_driver = {
 	.get_vblank_counter	= drm_vblank_no_hw_counter,
 	.enable_vblank		= exynos_drm_crtc_enable_vblank,
 	.disable_vblank		= exynos_drm_crtc_disable_vblank,
-	.gem_free_object	= exynos_drm_gem_free_object,
+	.gem_free_object_unlocked = exynos_drm_gem_free_object,
 	.gem_vm_ops		= &exynos_drm_gem_vm_ops,
 	.dumb_create		= exynos_drm_gem_dumb_create,
 	.dumb_map_offset	= exynos_drm_gem_dumb_map_offset,

drivers/gpu/drm/sti/sti_cursor.c

@@ -6,6 +6,8 @@
  * License terms:  GNU General Public License (GPL), version 2
  */
 
+#include <linux/seq_file.h>
+
 #include <drm/drm_atomic.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_cma_helper.h>

drivers/gpu/drm/sti/sti_gdp.c

@@ -5,6 +5,7 @@
  *          for STMicroelectronics.
  * License terms:  GNU General Public License (GPL), version 2
  */
+#include <linux/seq_file.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_fb_cma_helper.h>

drivers/gpu/drm/sti/sti_hda.c

@@ -8,6 +8,7 @@
 #include <linux/component.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/seq_file.h>
 
 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>

drivers/gpu/drm/sti/sti_hqvdp.c

@@ -7,6 +7,7 @@
 #include <linux/component.h>
 #include <linux/firmware.h>
 #include <linux/reset.h>
+#include <linux/seq_file.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_fb_cma_helper.h>

drivers/gpu/drm/sti/sti_mixer.c

@@ -5,6 +5,7 @@
  *          for STMicroelectronics.
  * License terms:  GNU General Public License (GPL), version 2
  */
+#include <linux/seq_file.h>
 
 #include "sti_compositor.h"
 #include "sti_mixer.h"

drivers/gpu/drm/sti/sti_tvout.c

@@ -12,6 +12,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
+#include <linux/seq_file.h>
 
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>

drivers/gpu/drm/sti/sti_vid.c

@@ -3,6 +3,7 @@
  * Author: Fabien Dessenne <fabien.dessenne@st.com> for STMicroelectronics.
  * License terms:  GNU General Public License (GPL), version 2
  */
+#include <linux/seq_file.h>
 
 #include <drm/drmP.h>
 

drivers/gpu/drm/tegra/drm.c

@@ -932,7 +932,7 @@ static struct drm_driver tegra_drm_driver = {
 	.debugfs_cleanup = tegra_debugfs_cleanup,
 #endif
 
-	.gem_free_object = tegra_bo_free_object,
+	.gem_free_object_unlocked = tegra_bo_free_object,
 	.gem_vm_ops = &tegra_bo_vm_ops,
 
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,

include/drm/drm_atomic_helper.h

@@ -110,6 +110,8 @@ int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
 				uint32_t flags);
 int drm_atomic_helper_connector_dpms(struct drm_connector *connector,
 				     int mode);
+struct drm_encoder *
+drm_atomic_helper_best_encoder(struct drm_connector *connector);
 
 /* default implementations for state handling */
 void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc);