[PATCH v3 1/2] drm: Wrap the check for atomic_commit implementation

[Dhinakaran Pandiyan <dhinakaran.pandiyan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

This check is useful for drivers that do not have DRIVER_ATOMIC set but
have atomic modesetting internally implemented. Wrap the check into a
function since this is used in many places and as a bonus, the function
name helps to document what the check is for.

v2:
Change return type to bool (Ville)
Move the function drm_atomic.h (Daniel)
Fixed comment marker for documentation

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_fb_helper.c             |  6 +++---
 drivers/gpu/drm/nouveau/nouveau_connector.c |  5 +++--
 drivers/gpu/drm/nouveau/nouveau_display.c   |  6 +++---
 drivers/gpu/drm/nouveau/nouveau_fbcon.c     |  3 ++-
 include/drm/drm_atomic.h                    | 12 ++++++++++++
 5 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 145d55f..730342c 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -405,7 +405,7 @@ static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 
 	drm_warn_on_modeset_not_all_locked(dev);
 
-	if (dev->mode_config.funcs->atomic_commit)
+	if (drm_drv_uses_atomic_modeset(dev))
 		return restore_fbdev_mode_atomic(fb_helper);
 
 	drm_for_each_plane(plane, dev) {
@@ -1444,7 +1444,7 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 		return -EBUSY;
 	}
 
-	if (dev->mode_config.funcs->atomic_commit) {
+	if (drm_drv_uses_atomic_modeset(dev)) {
 		ret = pan_display_atomic(var, info);
 		goto unlock;
 	}
@@ -2060,7 +2060,7 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
 	 * NULL we fallback to the default drm_atomic_helper_best_encoder()
 	 * helper.
 	 */
-	if (fb_helper->dev->mode_config.funcs->atomic_commit &&
+	if (drm_drv_uses_atomic_modeset(fb_helper->dev) &&
 	    !connector_funcs->best_encoder)
 		encoder = drm_atomic_helper_best_encoder(connector);
 	else
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 947c200..966d20a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -33,6 +33,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_atomic.h>
 
 #include "nouveau_reg.h"
 #include "nouveau_drv.h"
@@ -769,7 +770,7 @@ nouveau_connector_set_property(struct drm_connector *connector,
 	struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
 	int ret;
 
-	if (connector->dev->mode_config.funcs->atomic_commit)
+	if (drm_drv_uses_atomic_modeset(connector->dev))
 		return drm_atomic_helper_connector_set_property(connector, property, value);
 
 	ret = connector->funcs->atomic_set_property(&nv_connector->base,
@@ -1074,7 +1075,7 @@ nouveau_connector_helper_funcs = {
 static int
 nouveau_connector_dpms(struct drm_connector *connector, int mode)
 {
-	if (connector->dev->mode_config.funcs->atomic_commit)
+	if (drm_drv_uses_atomic_modeset(connector->dev))
 		return drm_atomic_helper_connector_dpms(connector, mode);
 	return drm_helper_connector_dpms(connector, mode);
 }
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index c5cf888..add353e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -162,7 +162,7 @@ nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 		if (nouveau_crtc(crtc)->index == pipe) {
 			struct drm_display_mode *mode;
-			if (dev->mode_config.funcs->atomic_commit)
+			if (drm_drv_uses_atomic_modeset(dev))
 				mode = &crtc->state->adjusted_mode;
 			else
 				mode = &crtc->hwmode;
@@ -738,7 +738,7 @@ nouveau_display_suspend(struct drm_device *dev, bool runtime)
 	struct nouveau_display *disp = nouveau_display(dev);
 	struct drm_crtc *crtc;
 
-	if (dev->mode_config.funcs->atomic_commit) {
+	if (drm_drv_uses_atomic_modeset(dev)) {
 		if (!runtime) {
 			disp->suspend = nouveau_atomic_suspend(dev);
 			if (IS_ERR(disp->suspend)) {
@@ -784,7 +784,7 @@ nouveau_display_resume(struct drm_device *dev, bool runtime)
 	struct drm_crtc *crtc;
 	int ret;
 
-	if (dev->mode_config.funcs->atomic_commit) {
+	if (drm_drv_uses_atomic_modeset(dev)) {
 		nouveau_display_init(dev);
 		if (disp->suspend) {
 			drm_atomic_helper_resume(dev, disp->suspend);
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 5600f6c..9de6abb 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -41,6 +41,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_fb_helper.h>
+#include <drm/drm_atomic.h>
 
 #include "nouveau_drv.h"
 #include "nouveau_gem.h"
@@ -524,7 +525,7 @@ nouveau_fbcon_init(struct drm_device *dev)
 		preferred_bpp = 32;
 
 	/* disable all the possible outputs/crtcs before entering KMS mode */
-	if (!dev->mode_config.funcs->atomic_commit)
+	if (!drm_drv_uses_atomic_modeset(dev))
 		drm_helper_disable_unused_functions(dev);
 
 	ret = drm_fb_helper_initial_config(&fbcon->helper, preferred_bpp);
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 8cc7ca2..fb5bf07 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -419,5 +419,17 @@ drm_atomic_crtc_needs_modeset(const struct drm_crtc_state *state)
 	       state->connectors_changed;
 }
 
+/**
+ * drm_drv_uses_atomic_modeset - check if the driver implements
+ * atomic_commit()
+ * @dev: DRM device
+ *
+ * This check is useful if drivers do not have DRIVER_ATOMIC set but
+ * have atomic modesetting internally implemented.
+ */
+static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
+{
+	return dev->mode_config.funcs->atomic_commit != NULL;
+}
 
 #endif /* DRM_ATOMIC_H_ */
-- 
2.7.4

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