[PATCH v2 06/10] drm/hisilicon: Add vblank feature

[Xinliang Liu]

Add vblank handle for ADE.

Signed-off-by: Xinliang Liu <xinliang.liu at linaro.org>
Signed-off-by: Xinwei Kong <kong.kongxinwei at hisilicon.com>
Signed-off-by: Andy Green <andy.green at linaro.org>
---
 drivers/gpu/drm/hisilicon/hisi_drm_ade.c | 78 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/hisilicon/hisi_drm_ade.h | 16 +++++++
 drivers/gpu/drm/hisilicon/hisi_drm_drv.c | 19 +++++++-
 3 files changed, 112 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/hisilicon/hisi_drm_ade.h

diff --git a/drivers/gpu/drm/hisilicon/hisi_drm_ade.c b/drivers/gpu/drm/hisilicon/hisi_drm_ade.c
index b0976c3..acb11e7 100644
--- a/drivers/gpu/drm/hisilicon/hisi_drm_ade.c
+++ b/drivers/gpu/drm/hisilicon/hisi_drm_ade.c
@@ -267,7 +267,79 @@ static void ade_power_down(struct ade_hw_ctx *ctx)
 	ctx->power_on = false;
 }
 
+static struct drm_crtc *hisi_get_crtc_from_index(struct drm_device *dev,
+						 unsigned int index)
+{
+	unsigned int index_tmp = 0;
+	struct drm_crtc *crtc;
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+		if (index_tmp == index)
+			return crtc;
+
+		index_tmp++;
+	}
+
+	WARN_ON(true);
+}
+
+int ade_enable_vblank(struct drm_device *dev, int crtc_index)
+{
+	struct drm_crtc *crtc = hisi_get_crtc_from_index(dev, crtc_index);
+	struct ade_crtc *acrtc = to_ade_crtc(crtc);
+	struct ade_hw_ctx *ctx = acrtc->ctx;
+	void __iomem *base = ctx->base;
+	u32 intr_en;
+
+	DRM_INFO("enable_vblank enter.\n");
+	if (!ctx->power_on)
+		(void)ade_power_up(ctx);
+
+	intr_en = readl(base + LDI_INT_EN);
+	intr_en |= LDI_ISR_FRAME_END_INT;
+	writel(intr_en, base + LDI_INT_EN);
 
+	return 0;
+}
+
+void ade_disable_vblank(struct drm_device *dev, int crtc_index)
+{
+	struct drm_crtc *crtc = hisi_get_crtc_from_index(dev, crtc_index);
+	struct ade_crtc *acrtc = to_ade_crtc(crtc);
+	struct ade_hw_ctx *ctx = acrtc->ctx;
+	void __iomem *base = ctx->base;
+	u32 intr_en;
+
+	DRM_INFO("disable_vblank enter.\n");
+	if (!ctx->power_on) {
+		DRM_ERROR("power is down! vblank disable fail\n");
+		return;
+	}
+	intr_en = readl(base + LDI_INT_EN);
+	intr_en &= ~LDI_ISR_FRAME_END_INT;
+	writel(intr_en, base + LDI_INT_EN);
+}
+
+static irqreturn_t ade_irq_handler(int irq, void *data)
+{
+	struct ade_crtc *acrtc = data;
+	struct ade_hw_ctx *ctx = acrtc->ctx;
+	struct drm_crtc *crtc = &acrtc->base;
+	struct drm_device *dev = crtc->dev;
+	void __iomem *base = ctx->base;
+	u32 status;
+
+	status = readl(base + LDI_MSK_INT);
+	/* DRM_INFO("LDI IRQ: status=0x%X\n",status); */
+
+	/* vblank irq */
+	if (status & LDI_ISR_FRAME_END_INT) {
+		writel(LDI_ISR_FRAME_END_INT, base + LDI_INT_CLR);
+		drm_handle_vblank(dev, drm_crtc_index(crtc));
+	}
+
+	return IRQ_HANDLED;
+}
 
 /*
  * set modules' reset mode: by software or hardware
@@ -858,6 +930,12 @@ static int ade_bind(struct device *dev, struct device *master, void *data)
 	if (ret)
 		return ret;
 
+	/* vblank irq init */
+	ret = request_irq(ctx->irq, ade_irq_handler, DRIVER_IRQ_SHARED,
+			  drm_dev->driver->name, acrtc);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/hisilicon/hisi_drm_ade.h b/drivers/gpu/drm/hisilicon/hisi_drm_ade.h
new file mode 100644
index 0000000..d1d7b5d
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/hisi_drm_ade.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2014-2015 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __HISI_DRM_ADE_H__
+#define __HISI_DRM_ADE_H__
+
+int ade_enable_vblank(struct drm_device *dev, int crtc_index);
+void ade_disable_vblank(struct drm_device *dev, int crtc_index);
+
+#endif
diff --git a/drivers/gpu/drm/hisilicon/hisi_drm_drv.c b/drivers/gpu/drm/hisilicon/hisi_drm_drv.c
index d0eca80..13f59aa 100644
--- a/drivers/gpu/drm/hisilicon/hisi_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/hisi_drm_drv.c
@@ -21,6 +21,7 @@
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_atomic_helper.h>
 
+#include "hisi_drm_ade.h"
 #include "hisi_drm_drv.h"
 
 #define DRIVER_NAME	"hisi-drm"
@@ -29,6 +30,7 @@ static int hisi_drm_unload(struct drm_device *dev)
 {
 	struct hisi_drm_private *priv = dev->dev_private;
 
+	drm_vblank_cleanup(dev);
 	drm_mode_config_cleanup(dev);
 	devm_kfree(dev->dev, priv);
 	dev->dev_private = NULL;
@@ -76,11 +78,22 @@ static int hisi_drm_load(struct drm_device *dev, unsigned long flags)
 		goto err_mode_config_cleanup;
 	}
 
+	/* vblank init */
+	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+	if (ret) {
+		DRM_ERROR("failed to initialize vblank.\n");
+		goto err_unbind_all;
+	}
+	/* with irq_enabled = true, we can use the vblank feature. */
+	dev->irq_enabled = true;
+
 	/* reset all the states of crtc/plane/encoder/connector */
 	drm_mode_config_reset(dev);
 
 	return 0;
 
+err_unbind_all:
+	component_unbind_all(dev->dev, dev);
 err_mode_config_cleanup:
 	drm_mode_config_cleanup(dev);
 	devm_kfree(dev->dev, priv);
@@ -126,7 +139,7 @@ static int hisi_gem_cma_dumb_create(struct drm_file *file,
 
 static struct drm_driver hisi_drm_driver = {
 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
-				  DRIVER_ATOMIC,
+				  DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
 	.load			= hisi_drm_load,
 	.unload                 = hisi_drm_unload,
 	.fops			= &hisi_drm_fops,
@@ -148,6 +161,10 @@ static struct drm_driver hisi_drm_driver = {
 	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
 	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
 
+	.get_vblank_counter	= drm_vblank_count,
+	.enable_vblank		= ade_enable_vblank,
+	.disable_vblank		= ade_disable_vblank,
+
 	.name			= "hisi",
 	.desc			= "Hisilicon SoCs' DRM Driver",
 	.date			= "20150718",
-- 
1.9.1