drm/tilcdc: cleanup runtime PM handling

Cleanup runtime PM handling. Before the patch the usage of pm_runtime
calls was inconsistent and hard to follow. After the update the
pm_runtime calls are removed from set_scanout() and called around
major operations that access the HW. After the patch the DPMS code does
not have pm_runtime_forbid/allow calls any more and
pm_runtime_irq_safe() is not set anymore.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
[Added description to the patch]
Signed-off-by: Jyri Sarha <jsarha@ti.com>

2 files changed, 11 insertions, 9 deletions

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 465fd047875a..08b1e03b502e 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -71,7 +71,6 @@ static void set_scanout(struct drm_crtc *crtc, int n)
         struct drm_device *dev = crtc->dev;
         struct tilcdc_drm_private *priv = dev->dev_private;
 
-        pm_runtime_get_sync(dev->dev);
         tilcdc_write(dev, base_reg[n], tilcdc_crtc->start);
         tilcdc_write(dev, ceil_reg[n], tilcdc_crtc->end);
         if (tilcdc_crtc->scanout[n]) {
@@ -81,7 +80,6 @@ static void set_scanout(struct drm_crtc *crtc, int n)
         tilcdc_crtc->scanout[n] = crtc->primary->fb;
         drm_framebuffer_reference(tilcdc_crtc->scanout[n]);
         tilcdc_crtc->dirty &= ~stat[n];
-        pm_runtime_put_sync(dev->dev);
 }
 
 static void update_scanout(struct drm_crtc *crtc)
@@ -186,8 +184,13 @@ static int tilcdc_crtc_page_flip(struct drm_crtc *crtc,
 
         crtc->primary->fb = fb;
         tilcdc_crtc->event = event;
+
+        pm_runtime_get_sync(dev->dev);
+
         update_scanout(crtc);
 
+        pm_runtime_put_sync(dev->dev);
+
         return 0;
 }
 
@@ -206,10 +209,8 @@ void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode)
 
         tilcdc_crtc->dpms = mode;
 
-        pm_runtime_get_sync(dev->dev);
-
         if (mode == DRM_MODE_DPMS_ON) {
-                pm_runtime_forbid(dev->dev);
+                pm_runtime_get_sync(dev->dev);
                 start(crtc);
         } else {
                 tilcdc_crtc->frame_done = false;
@@ -227,10 +228,9 @@ void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode)
                         if (ret == 0)
                                 dev_err(dev->dev, "timeout waiting for framedone\n");
                 }
-                pm_runtime_allow(dev->dev);
-        }
 
-        pm_runtime_put_sync(dev->dev);
+                pm_runtime_put_sync(dev->dev);
+        }
 }
 
 static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
@@ -455,13 +455,16 @@ static int tilcdc_crtc_mode_set(struct drm_crtc *crtc,
 static int tilcdc_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
                 struct drm_framebuffer *old_fb)
 {
+        struct drm_device *dev = crtc->dev;
         int r;
 
         r = tilcdc_verify_fb(crtc, crtc->primary->fb);
         if (r)
                 return r;
 
+        pm_runtime_get_sync(dev->dev);
         update_scanout(crtc);
+        pm_runtime_put_sync(dev->dev);
         return 0;
 }
 
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 47096b1b8b2a..47f0e0282d5d 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -230,7 +230,6 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
         DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
 
         pm_runtime_enable(dev->dev);
-        pm_runtime_irq_safe(dev->dev);
 
         /* Determine LCD IP Version */
         pm_runtime_get_sync(dev->dev);