intelfb: add vsync interrupt support

[05/05] intelfb: Honor FB_ACTIVATE_VBL for display panning

Extends the intelfb_vsync struct to store panning offset. The interrupt service routine uses the stored panning offset if a pan is requested for the vsync. intelfbhw_disable_irq also pans the display if there is a pending request.

Signed-off-by: Eric Hustvedt <ehustvedt@cecropia.com>

diff --git a/drivers/video/intelfb/intelfb.h b/drivers/video/intelfb/intelfb.h
index 65ac370..abd4c56 100644 (file)
--- a/drivers/video/intelfb/intelfb.h
+++ b/drivers/video/intelfb/intelfb.h
@@ -211,6 +211,8 @@ struct intelfb_heap_data {
 struct intelfb_vsync {
        wait_queue_head_t wait;
        unsigned int count;
+       int pan_display;
+       u32 pan_offset;
 };
 
 struct intelfb_info {

diff --git a/drivers/video/intelfb/intelfbdrv.c b/drivers/video/intelfb/intelfbdrv.c
index 08f8241..9e93f82 100644 (file)
--- a/drivers/video/intelfb/intelfbdrv.c
+++ b/drivers/video/intelfb/intelfbdrv.c
@@ -900,6 +900,8 @@ intelfb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
        init_waitqueue_head(&dinfo->vsync.wait);
        spin_lock_init(&dinfo->int_lock);
        dinfo->irq_flags = 0;
+       dinfo->vsync.pan_display = 0;
+       dinfo->vsync.pan_offset = 0;
 
        return 0;
 

diff --git a/drivers/video/intelfb/intelfbhw.c b/drivers/video/intelfb/intelfbhw.c
index 0f9631c..8038f55 100644 (file)
--- a/drivers/video/intelfb/intelfbhw.c
+++ b/drivers/video/intelfb/intelfbhw.c
@@ -371,7 +371,13 @@ intelfbhw_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 
        offset += dinfo->fb.offset << 12;
 
-       OUTREG(DSPABASE, offset);
+       dinfo->vsync.pan_offset = offset;
+       if ((var->activate & FB_ACTIVATE_VBL) && !intelfbhw_enable_irq(dinfo, 0)) {
+               dinfo->vsync.pan_display = 1;
+       } else {
+               dinfo->vsync.pan_display = 0;
+               OUTREG(DSPABASE, offset);
+       }
 
        return 0;
 }
@@ -1965,6 +1971,10 @@ intelfbhw_irq(int irq, void *dev_id, struct pt_regs *fp) {
 
        if (tmp & VSYNC_PIPE_A_INTERRUPT) {
                dinfo->vsync.count++;
+               if (dinfo->vsync.pan_display) {
+                       dinfo->vsync.pan_display = 0;
+                       OUTREG(DSPABASE, dinfo->vsync.pan_offset);
+               }
                wake_up_interruptible(&dinfo->vsync.wait);
                handled = 1;
        }
@@ -2007,6 +2017,10 @@ intelfbhw_disable_irq(struct intelfb_info *dinfo) {
        u16 tmp;
 
        if (test_and_clear_bit(0, &dinfo->irq_flags)) {
+               if (dinfo->vsync.pan_display) {
+                       dinfo->vsync.pan_display = 0;
+                       OUTREG(DSPABASE, dinfo->vsync.pan_offset);
+               }
                spin_lock_irq(&dinfo->int_lock);
                OUTREG16(HWSTAM, 0xffff);
                OUTREG16(IMR, 0xffff);