From: Eric Hustvedt Date: Tue, 20 Jun 2006 18:36:41 +0000 (-0400) Subject: intelfb: add vsync interrupt support X-Git-Tag: v2.6.19-rc1~645^2~13 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7649757bd900bc900adcd95ab08903cdc28342fa;p=linux-2.6 intelfb: add vsync interrupt support [03/05] intelfb: Implement basic interrupt handling Functions have been added to enable and disable interrupts using the MMIO registers. Currently only pipe A vsync interrupts are enabled. A generalized vsync accounting struct is defined, with the intent that it can encapsulate per-pipe vsync related info in the future. Currently a single instance is hard-coded. The interrupt service routine currently only looks for vsync interrupts on pipe A, and increments a counter and wakes up anyone waiting on it. This implementation is heavily influenced by similar implementations in the atyfb and matroxfb drivers. Signed-off-by: Eric Hustvedt --- diff --git a/drivers/video/intelfb/intelfb.h b/drivers/video/intelfb/intelfb.h index cb016fe4d4..dab1f2d764 100644 --- a/drivers/video/intelfb/intelfb.h +++ b/drivers/video/intelfb/intelfb.h @@ -208,6 +208,11 @@ struct intelfb_heap_data { u32 size; // in bytes }; +struct intelfb_vsync { + wait_queue_head_t wait; + unsigned int count; +}; + struct intelfb_info { struct fb_info *info; struct fb_ops *fbops; @@ -271,6 +276,12 @@ struct intelfb_info { int fixed_mode; int ring_active; int flag; + unsigned long irq_flags; + int open; + + /* vsync */ + struct intelfb_vsync vsync; + spinlock_t int_lock; /* hw cursor */ int cursor_on; diff --git a/drivers/video/intelfb/intelfbdrv.c b/drivers/video/intelfb/intelfbdrv.c index 0a0a8b199e..068c56d4e6 100644 --- a/drivers/video/intelfb/intelfbdrv.c +++ b/drivers/video/intelfb/intelfbdrv.c @@ -137,6 +137,8 @@ static void __devinit get_initial_mode(struct intelfb_info *dinfo); static void update_dinfo(struct intelfb_info *dinfo, struct fb_var_screeninfo *var); +static int intelfb_open(struct fb_info *info, int user); +static int intelfb_release(struct fb_info *info, int user); static int intelfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info); static int intelfb_set_par(struct fb_info *info); @@ -195,6 +197,8 @@ static int num_registered = 0; /* fb ops */ static struct fb_ops intel_fb_ops = { .owner = THIS_MODULE, + .fb_open = intelfb_open, + .fb_release = intelfb_release, .fb_check_var = intelfb_check_var, .fb_set_par = intelfb_set_par, .fb_setcolreg = intelfb_setcolreg, @@ -447,6 +451,8 @@ cleanup(struct intelfb_info *dinfo) if (!dinfo) return; + intelfbhw_disable_irq(dinfo); + fb_dealloc_cmap(&dinfo->info->cmap); kfree(dinfo->info->pixmap.addr); @@ -889,6 +895,11 @@ intelfb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent) } dinfo->registered = 1; + dinfo->open = 0; + + init_waitqueue_head(&dinfo->vsync.wait); + spin_lock_init(&dinfo->int_lock); + dinfo->irq_flags = 0; return 0; @@ -1188,6 +1199,34 @@ update_dinfo(struct intelfb_info *dinfo, struct fb_var_screeninfo *var) * fbdev interface * ***************************************************************/ +static int +intelfb_open(struct fb_info *info, int user) +{ + struct intelfb_info *dinfo = GET_DINFO(info); + + if (user) { + dinfo->open++; + } + + return 0; +} + +static int +intelfb_release(struct fb_info *info, int user) +{ + struct intelfb_info *dinfo = GET_DINFO(info); + + if (user) { + dinfo->open--; + msleep(1); + if (!dinfo->open) { + intelfbhw_disable_irq(dinfo); + } + } + + return 0; +} + static int intelfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { diff --git a/drivers/video/intelfb/intelfbhw.c b/drivers/video/intelfb/intelfbhw.c index 05aded669c..1a698a7230 100644 --- a/drivers/video/intelfb/intelfbhw.c +++ b/drivers/video/intelfb/intelfbhw.c @@ -34,6 +34,7 @@ #include #include #include +#include #include @@ -1943,3 +1944,78 @@ intelfbhw_cursor_reset(struct intelfb_info *dinfo) { addr += 16; } } + +static irqreturn_t +intelfbhw_irq(int irq, void *dev_id, struct pt_regs *fp) { + int handled = 0; + u16 tmp; + struct intelfb_info *dinfo = (struct intelfb_info *)dev_id; + + spin_lock(&dinfo->int_lock); + + tmp = INREG16(IIR); + tmp &= VSYNC_PIPE_A_INTERRUPT; + + if (tmp == 0) { + spin_unlock(&dinfo->int_lock); + return IRQ_RETVAL(handled); + } + + OUTREG16(IIR, tmp); + + if (tmp & VSYNC_PIPE_A_INTERRUPT) { + dinfo->vsync.count++; + wake_up_interruptible(&dinfo->vsync.wait); + handled = 1; + } + + spin_unlock(&dinfo->int_lock); + + return IRQ_RETVAL(handled); +} + +int +intelfbhw_enable_irq(struct intelfb_info *dinfo, int reenable) { + + if (!test_and_set_bit(0, &dinfo->irq_flags)) { + if (request_irq(dinfo->pdev->irq, intelfbhw_irq, SA_SHIRQ, "intelfb", dinfo)) { + clear_bit(0, &dinfo->irq_flags); + return -EINVAL; + } + + spin_lock_irq(&dinfo->int_lock); + OUTREG16(HWSTAM, 0xfffe); + OUTREG16(IMR, 0x0); + OUTREG16(IER, VSYNC_PIPE_A_INTERRUPT); + spin_unlock_irq(&dinfo->int_lock); + } else if (reenable) { + u16 ier; + + spin_lock_irq(&dinfo->int_lock); + ier = INREG16(IER); + if ((ier & VSYNC_PIPE_A_INTERRUPT)) { + DBG_MSG("someone disabled the IRQ [%08X]\n", ier); + OUTREG(IER, VSYNC_PIPE_A_INTERRUPT); + } + spin_unlock_irq(&dinfo->int_lock); + } + return 0; +} + +void +intelfbhw_disable_irq(struct intelfb_info *dinfo) { + u16 tmp; + + if (test_and_clear_bit(0, &dinfo->irq_flags)) { + spin_lock_irq(&dinfo->int_lock); + OUTREG16(HWSTAM, 0xffff); + OUTREG16(IMR, 0xffff); + OUTREG16(IER, 0x0); + + tmp = INREG16(IIR); + OUTREG16(IIR, tmp); + spin_unlock_irq(&dinfo->int_lock); + + free_irq(dinfo->pdev->irq, dinfo); + } +} diff --git a/drivers/video/intelfb/intelfbhw.h b/drivers/video/intelfb/intelfbhw.h index 8d2e36972f..aa0c139a23 100644 --- a/drivers/video/intelfb/intelfbhw.h +++ b/drivers/video/intelfb/intelfbhw.h @@ -561,5 +561,7 @@ extern void intelfbhw_cursor_setcolor(struct intelfb_info *dinfo, u32 bg, extern void intelfbhw_cursor_load(struct intelfb_info *dinfo, int width, int height, u8 *data); extern void intelfbhw_cursor_reset(struct intelfb_info *dinfo); +extern int intelfbhw_enable_irq(struct intelfb_info *dinfo, int reenable); +extern void intelfbhw_disable_irq(struct intelfb_info *dinfo); #endif /* _INTELFBHW_H */