diff mbox series

[v2,53/59] drm/kmb: disable the LCD layer in EOF irq handler

Message ID 1594760265-11618-54-git-send-email-anitha.chrisanthus@intel.com (mailing list archive)
State New, archived
Headers show
Series Add support for KeemBay DRM driver | expand

Commit Message

Chrisanthus, Anitha July 14, 2020, 8:57 p.m. UTC 
When disabling/enabling LCD layers, the change takes effect
immediately and does not wait for EOF (end of frame). If we
disable an LCD layer in kmb_plane_atomic_disable, then the frame
reappears with incorrect display offsets.

The solution is to mark the plane as disabled when
kmb_plane_atomic_disable is called but actually disable the LCD
layer when EOF irq is being handled.

Also only enable one plane (video plane0) as there is no use case for
multiple planes.

v2: Moved extern to .h, removed license text, upclassed dev_private.

Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
Signed-off-by: Edmund Dea <edmund.j.dea@intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
---
 drivers/gpu/drm/kmb/kmb_drv.c   | 36 +++++++++++++++++++++++++++++-------
 drivers/gpu/drm/kmb/kmb_drv.h   |  1 +
 drivers/gpu/drm/kmb/kmb_plane.c | 24 ++++++++----------------
 drivers/gpu/drm/kmb/kmb_plane.h | 11 ++++++++++-
 4 files changed, 48 insertions(+), 24 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/kmb/kmb_drv.c b/drivers/gpu/drm/kmb/kmb_drv.c
index f5e1def..55574c1 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.c
+++ b/drivers/gpu/drm/kmb/kmb_drv.c
@@ -347,25 +347,47 @@  static void kmb_setup_mode_config(struct drm_device *drm)
 static irqreturn_t handle_lcd_irq(struct drm_device *dev)
 {
 	unsigned long status, val;
+	int plane_id;
 	struct kmb_drm_private *dev_p = to_kmb(dev);
 
 	status = kmb_read_lcd(dev_p, LCD_INT_STATUS);
 	if (status & LCD_INT_EOF) {
-	/*To DO - handle EOF interrupt? */
-	kmb_write_lcd(dev_p, LCD_INT_CLEAR, LCD_INT_EOF);
+		/* TODO - handle EOF interrupt? */
+		kmb_write_lcd(dev_p, LCD_INT_CLEAR, LCD_INT_EOF);
+
+		/* When disabling/enabling LCD layers, the change takes effect
+		 * immediately and does not wait for EOF (end of frame).
+		 * When kmb_plane_atomic_disable is called, mark the plane as
+		 * disabled but actually disable the plane when EOF irq is
+		 * being handled.
+		 */
+		for (plane_id = LAYER_0; plane_id < KMB_MAX_PLANES;
+				plane_id++) {
+			if (plane_status[plane_id].disable) {
+				kmb_clr_bitmask_lcd(dev_p,
+					LCD_LAYERn_DMA_CFG(plane_id),
+					LCD_DMA_LAYER_ENABLE);
+
+				kmb_clr_bitmask_lcd(dev_p, LCD_CONTROL,
+					plane_status[plane_id].ctrl);
+
+				plane_status[plane_id].disable = false;
+			}
+		}
 	}
+
 	if (status & LCD_INT_LINE_CMP) {
 		/* clear line compare interrupt */
-		kmb_write_lcd(dev_p, LCD_INT_CLEAR,
-				LCD_INT_LINE_CMP);
+		kmb_write_lcd(dev_p, LCD_INT_CLEAR, LCD_INT_LINE_CMP);
 	}
+
 	if (status & LCD_INT_LAYER) {
 		/* Clear layer interrupts */
-		kmb_write_lcd(dev->dev_private, LCD_INT_CLEAR, LCD_INT_LAYER);
+		kmb_write_lcd(dev_p, LCD_INT_CLEAR, LCD_INT_LAYER);
 	}
 
 	if (status & LCD_INT_VERT_COMP) {
-		/* read VSTATUS */
+		/* Read VSTATUS */
 		val = kmb_read_lcd(dev_p, LCD_VSTATUS);
 		val = (val & LCD_VSTATUS_VERTICAL_STATUS_MASK);
 		switch (val) {
@@ -382,7 +404,7 @@  static irqreturn_t handle_lcd_irq(struct drm_device *dev)
 	}
 
 	/* Clear all interrupts */
-	kmb_set_bitmask_lcd(dev->dev_private, LCD_INT_CLEAR, ~0x0);
+	kmb_set_bitmask_lcd(dev_p, LCD_INT_CLEAR, 1);
 	return IRQ_HANDLED;
 }
 
diff --git a/drivers/gpu/drm/kmb/kmb_drv.h b/drivers/gpu/drm/kmb/kmb_drv.h
index 4b97a3d..94b62b9 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.h
+++ b/drivers/gpu/drm/kmb/kmb_drv.h
@@ -19,6 +19,7 @@ 
 
 #define crtc_to_kmb_priv(x)	container_of(x, struct kmb_drm_private, crtc)
 
+
 struct kmb_drm_private {
 	struct drm_device drm;
 	void __iomem *lcd_mmio;
diff --git a/drivers/gpu/drm/kmb/kmb_plane.c b/drivers/gpu/drm/kmb/kmb_plane.c
index f92e191..8b2b202 100644
--- a/drivers/gpu/drm/kmb/kmb_plane.c
+++ b/drivers/gpu/drm/kmb/kmb_plane.c
@@ -21,6 +21,8 @@ 
 #include "kmb_plane.h"
 #include "kmb_regs.h"
 
+struct layer_status plane_status[KMB_MAX_PLANES];
+
 const uint32_t layer_irqs[] = {
 	LCD_INT_VL0,
 	LCD_INT_VL1,
@@ -62,34 +64,24 @@  static void kmb_plane_atomic_disable(struct drm_plane *plane,
 				     struct drm_plane_state *state)
 {
 	struct kmb_plane *kmb_plane = to_kmb_plane(plane);
-	int ctrl = 0;
-	struct kmb_drm_private *dev_p;
-	int plane_id;
-
-	dev_p = to_kmb(plane->dev);
-	plane_id = kmb_plane->id;
+	int plane_id = kmb_plane->id;
 
 	switch (plane_id) {
 	case LAYER_0:
-		ctrl = LCD_CTRL_VL1_ENABLE;
+		plane_status[plane_id].ctrl = LCD_CTRL_VL1_ENABLE;
 		break;
 	case LAYER_1:
-		ctrl = LCD_CTRL_VL2_ENABLE;
+		plane_status[plane_id].ctrl = LCD_CTRL_VL2_ENABLE;
 		break;
 	case LAYER_2:
-		ctrl = LCD_CTRL_GL1_ENABLE;
+		plane_status[plane_id].ctrl = LCD_CTRL_GL1_ENABLE;
 		break;
 	case LAYER_3:
-		ctrl = LCD_CTRL_GL2_ENABLE;
+		plane_status[plane_id].ctrl = LCD_CTRL_GL2_ENABLE;
 		break;
 	}
 
-	kmb_clr_bitmask_lcd(dev_p, LCD_LAYERn_DMA_CFG(plane_id),
-			    LCD_DMA_LAYER_ENABLE);
-	kmb_clr_bitmask_lcd(dev_p, LCD_CONTROL, ctrl);
-	DRM_DEBUG("%s : %d lcd_ctrl = 0x%x lcd_int_enable=0x%x\n",
-		  __func__, __LINE__, kmb_read_lcd(dev_p, LCD_CONTROL),
-		  kmb_read_lcd(dev_p, LCD_INT_ENABLE));
+	plane_status[plane_id].disable = true;
 }
 
 unsigned int set_pixel_format(u32 format)
diff --git a/drivers/gpu/drm/kmb/kmb_plane.h b/drivers/gpu/drm/kmb/kmb_plane.h
index 6e4da47..98c48a9 100644
--- a/drivers/gpu/drm/kmb/kmb_plane.h
+++ b/drivers/gpu/drm/kmb/kmb_plane.h
@@ -41,9 +41,11 @@  enum layer_id {
 	LAYER_1,
 	LAYER_2,
 	LAYER_3,
-	KMB_MAX_PLANES,
+//	KMB_MAX_PLANES,
 };
 
+#define KMB_MAX_PLANES 1
+
 enum sub_plane_id {
 	Y_PLANE,
 	U_PLANE,
@@ -105,6 +107,13 @@  static const u32 csc_coef_lcd[] = {
 	-179, 125, -226
 };
 
+struct layer_status {
+	bool disable;
+	u32 ctrl;
+};
+
+extern struct layer_status plane_status[KMB_MAX_PLANES];
+
 struct kmb_plane *kmb_plane_init(struct drm_device *drm);
 void kmb_plane_destroy(struct drm_plane *plane);
 #endif /* __KMB_PLANE_H__ */