video: tegra: add host1x support to driver

includes changes by:

Antti Hatala <ahatala@nvidia.com> (1)
Gary King <gking@nvidia.com> (1)
Erik Gilling <konkers@android.com> (2)

Antti Hatala <ahatala@nvidia.com>
video: tegra: dc: use nvhost driver for host1x power management

Gary King <gking@nvidia.com>
video: tegra: fb: add ioctl to flip dc windows to nvmap handles

Erik Gilling <konkers@android.com>
video: tegra: dc: increment syncpoints following window flips
video: tegra: drain syncpt waits on display disable

Original commit messages:
**
video: tegra: dc: use nvhost driver for host1x power management

Incrementing the frame done syncpoint value from the display interrupt
requires that the host module is powered on. As the syncpoint state is
saved and restored automatically by the host driver a cpu increment of
a syncpoint in the powered down state will be lost.

Also adds checks for host module being powered.
**
video: tegra: fb: add ioctl to flip dc windows to nvmap handles

tegra user-space graphics drivers may allocate framebuffers using
nvmap rather than rendering to the common framebuffer, this may
be done to support deeper buffer pipelining, color formats
and pixel layouts other than the initial bootup framebuffer,
etc.

to use this ioctl, a caller must first specify an nvmap fd
which is already open in the calling process so that the
subsequent flip ioctls may be properly validated. flips are performed
asynchronously, with flip completion notifications provided back to
the caller via the host1x syncpoint mechanism

based on earlier changes made by Antti Hatala <ahatala@nvidia.com>
and Erik Gilling <konkers@android.com>

Change-Id: I4e8a8bb92085a485d65fd87d89112b2969ee37ff
Signed-off-by: Gary King <gking@nvidia.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/video/tegra/dc/dc_priv.h b/drivers/video/tegra/dc/dc_priv.h
index 2297be40f030..39a03e8fb9c0 100644
--- a/drivers/video/tegra/dc/dc_priv.h
+++ b/drivers/video/tegra/dc/dc_priv.h
@@ -22,6 +22,7 @@
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/wait.h>
+#include "../host/dev.h"
 
 struct tegra_dc;
 
@@ -54,7 +55,6 @@ struct tegra_dc {
 	int				irq;
 
 	struct clk			*clk;
-	struct clk			*host1x_clk;
 
 	bool				enabled;
 
@@ -74,17 +74,33 @@ struct tegra_dc {
 
 	struct resource			*fb_mem;
 	struct tegra_fb_info		*fb;
+
+	u32				syncpt_id;
+	u32				syncpt_min;
+	u32				syncpt_max;
 };
 
+static inline void tegra_dc_io_start(struct tegra_dc *dc)
+{
+	nvhost_module_busy(&dc->ndev->host->mod);
+}
+
+static inline void tegra_dc_io_end(struct tegra_dc *dc)
+{
+	nvhost_module_idle(&dc->ndev->host->mod);
+}
+
 static inline unsigned long tegra_dc_readl(struct tegra_dc *dc,
 					   unsigned long reg)
 {
+	BUG_ON(!nvhost_module_powered(&dc->ndev->host->mod));
 	return readl(dc->base + reg * 4);
 }
 
 static inline void tegra_dc_writel(struct tegra_dc *dc, unsigned long val,
 				   unsigned long reg)
 {
+	BUG_ON(!nvhost_module_powered(&dc->ndev->host->mod));
 	writel(val, dc->base + reg * 4);
 }