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drm/tegra: Implement page-flipping support

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All the necessary support bits like .mode_set_base() and VBLANK are now
available, so page-flipping case easily be implemented on top.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
This commit is contained in:
Thierry Reding 2012-11-28 12:00:18 +01:00
parent 6e5ff99899
commit 3c03c46ac8
4 changed files with 82 additions and 0 deletions
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66
drivers/gpu/drm/tegra/dc.c
View File

@ -183,7 +183,72 @@ void tegra_dc_disable_vblank(struct tegra_dc *dc)
spin_unlock_irqrestore(&dc->lock, flags);
}
static void tegra_dc_finish_page_flip(struct tegra_dc *dc)
{
struct drm_device *drm = dc->base.dev;
struct drm_crtc *crtc = &dc->base;
struct drm_gem_cma_object *gem;
unsigned long flags, base;
if (!dc->event)
return;
gem = drm_fb_cma_get_gem_obj(crtc->fb, 0);
/* check if new start address has been latched */
tegra_dc_writel(dc, READ_MUX, DC_CMD_STATE_ACCESS);
base = tegra_dc_readl(dc, DC_WINBUF_START_ADDR);
tegra_dc_writel(dc, 0, DC_CMD_STATE_ACCESS);
if (base == gem->paddr + crtc->fb->offsets[0]) {
spin_lock_irqsave(&drm->event_lock, flags);
drm_send_vblank_event(drm, dc->pipe, dc->event);
drm_vblank_put(drm, dc->pipe);
dc->event = NULL;
spin_unlock_irqrestore(&drm->event_lock, flags);
}
}
void tegra_dc_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file)
{
struct tegra_dc *dc = to_tegra_dc(crtc);
struct drm_device *drm = crtc->dev;
unsigned long flags;
spin_lock_irqsave(&drm->event_lock, flags);
if (dc->event && dc->event->base.file_priv == file) {
dc->event->base.destroy(&dc->event->base);
drm_vblank_put(drm, dc->pipe);
dc->event = NULL;
}
spin_unlock_irqrestore(&drm->event_lock, flags);
}
static int tegra_dc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
struct drm_pending_vblank_event *event)
{
struct tegra_dc *dc = to_tegra_dc(crtc);
struct drm_device *drm = crtc->dev;
if (dc->event)
return -EBUSY;
if (event) {
event->pipe = dc->pipe;
dc->event = event;
drm_vblank_get(drm, dc->pipe);
}
tegra_dc_set_base(dc, 0, 0, fb);
crtc->fb = fb;
return 0;
}
static const struct drm_crtc_funcs tegra_crtc_funcs = {
.page_flip = tegra_dc_page_flip,
.set_config = drm_crtc_helper_set_config,
.destroy = drm_crtc_cleanup,
};
@ -665,6 +730,7 @@ static irqreturn_t tegra_dc_irq(int irq, void *data)
dev_dbg(dc->dev, "%s(): vertical blank\n", __func__);
*/
drm_handle_vblank(dc->base.dev, dc->pipe);
tegra_dc_finish_page_flip(dc);
}
if (status & (WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT)) {

2
drivers/gpu/drm/tegra/dc.h
View File

@ -58,6 +58,8 @@
#define DC_CMD_SIGNAL_RAISE3 0x03e
#define DC_CMD_STATE_ACCESS 0x040
#define READ_MUX (1 << 0)
#define WRITE_MUX (1 << 2)
#define DC_CMD_STATE_CONTROL 0x041
#define GENERAL_ACT_REQ (1 << 0)

9
drivers/gpu/drm/tegra/drm.c
View File

@ -135,11 +135,20 @@ static void tegra_drm_disable_vblank(struct drm_device *drm, int pipe)
tegra_dc_disable_vblank(dc);
}
static void tegra_drm_preclose(struct drm_device *drm, struct drm_file *file)
{
struct drm_crtc *crtc;
list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
tegra_dc_cancel_page_flip(crtc, file);
}
struct drm_driver tegra_drm_driver = {
.driver_features = DRIVER_BUS_PLATFORM | DRIVER_MODESET | DRIVER_GEM,
.load = tegra_drm_load,
.unload = tegra_drm_unload,
.open = tegra_drm_open,
.preclose = tegra_drm_preclose,
.lastclose = tegra_drm_lastclose,
.get_vblank_counter = tegra_drm_get_vblank_counter,

5
drivers/gpu/drm/tegra/drm.h
View File

@ -84,6 +84,9 @@ struct tegra_dc {
struct drm_info_list *debugfs_files;
struct drm_minor *minor;
struct dentry *debugfs;
/* page-flip handling */
struct drm_pending_vblank_event *event;
};
static inline struct tegra_dc *host1x_client_to_dc(struct host1x_client *client)
@ -133,6 +136,8 @@ extern int tegra_dc_setup_window(struct tegra_dc *dc, unsigned int index,
const struct tegra_dc_window *window);
extern void tegra_dc_enable_vblank(struct tegra_dc *dc);
extern void tegra_dc_disable_vblank(struct tegra_dc *dc);
extern void tegra_dc_cancel_page_flip(struct drm_crtc *crtc,
struct drm_file *file);
struct tegra_output_ops {
int (*enable)(struct tegra_output *output);