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https://github.com/FEX-Emu/linux.git
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s3c-fb: add wait for VSYNC ioctl
Add VSYNC interrupt support and an ioctl that allows waiting for it. Interrupts are turned on only when needed. Signed-off-by: Pawel Osciak <p.osciak@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: InKi Dae <inki.dae@samsung.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pawel Osciak
Linus Torvalds
parent
067b226b9e
commit
efdc846d2f
@ -300,6 +300,7 @@
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#define VIDINTCON0_FRAMESEL0_FRONTPORCH (0x3 << 15)
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#define VIDINTCON0_FRAMESEL1 (1 << 13)
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#define VIDINTCON0_FRAMESEL1_MASK (0x3 << 13)
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#define VIDINTCON0_FRAMESEL1_NONE (0x0 << 13)
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#define VIDINTCON0_FRAMESEL1_BACKPORCH (0x1 << 13)
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#define VIDINTCON0_FRAMESEL1_VSYNC (0x2 << 13)
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@ -21,6 +21,8 @@
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#include <linux/clk.h>
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#include <linux/fb.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/interrupt.h>
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#include <mach/map.h>
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#include <plat/regs-fb-v4.h>
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@ -48,6 +50,11 @@
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__raw_writel(v, r); } while(0)
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#endif /* FB_S3C_DEBUG_REGWRITE */
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/* irq_flags bits */
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#define S3C_FB_VSYNC_IRQ_EN 0
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#define VSYNC_TIMEOUT_MSEC 50
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struct s3c_fb;
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#define VALID_BPP(x) (1 << ((x) - 1))
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@ -155,6 +162,16 @@ struct s3c_fb_win {
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unsigned int index;
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};
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/**
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* struct s3c_fb_vsync - vsync information
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* @wait: a queue for processes waiting for vsync
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* @count: vsync interrupt count
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*/
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struct s3c_fb_vsync {
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wait_queue_head_t wait;
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unsigned int count;
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};
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/**
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* struct s3c_fb - overall hardware state of the hardware
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* @dev: The device that we bound to, for printing, etc.
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@ -165,6 +182,9 @@ struct s3c_fb_win {
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* @enabled: A bitmask of enabled hardware windows.
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* @pdata: The platform configuration data passed with the device.
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* @windows: The hardware windows that have been claimed.
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* @irq_no: IRQ line number
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* @irq_flags: irq flags
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* @vsync_info: VSYNC-related information (count, queues...)
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*/
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struct s3c_fb {
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struct device *dev;
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@ -177,6 +197,10 @@ struct s3c_fb {
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struct s3c_fb_platdata *pdata;
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struct s3c_fb_win *windows[S3C_FB_MAX_WIN];
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int irq_no;
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unsigned long irq_flags;
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struct s3c_fb_vsync vsync_info;
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};
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/**
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@ -798,6 +822,124 @@ static int s3c_fb_pan_display(struct fb_var_screeninfo *var,
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return 0;
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}
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/**
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* s3c_fb_enable_irq() - enable framebuffer interrupts
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* @sfb: main hardware state
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*/
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static void s3c_fb_enable_irq(struct s3c_fb *sfb)
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{
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void __iomem *regs = sfb->regs;
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u32 irq_ctrl_reg;
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if (!test_and_set_bit(S3C_FB_VSYNC_IRQ_EN, &sfb->irq_flags)) {
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/* IRQ disabled, enable it */
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irq_ctrl_reg = readl(regs + VIDINTCON0);
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irq_ctrl_reg |= VIDINTCON0_INT_ENABLE;
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irq_ctrl_reg |= VIDINTCON0_INT_FRAME;
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irq_ctrl_reg &= ~VIDINTCON0_FRAMESEL0_MASK;
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irq_ctrl_reg |= VIDINTCON0_FRAMESEL0_VSYNC;
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irq_ctrl_reg &= ~VIDINTCON0_FRAMESEL1_MASK;
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irq_ctrl_reg |= VIDINTCON0_FRAMESEL1_NONE;
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writel(irq_ctrl_reg, regs + VIDINTCON0);
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}
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}
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/**
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* s3c_fb_disable_irq() - disable framebuffer interrupts
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* @sfb: main hardware state
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*/
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static void s3c_fb_disable_irq(struct s3c_fb *sfb)
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{
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void __iomem *regs = sfb->regs;
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u32 irq_ctrl_reg;
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if (test_and_clear_bit(S3C_FB_VSYNC_IRQ_EN, &sfb->irq_flags)) {
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/* IRQ enabled, disable it */
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irq_ctrl_reg = readl(regs + VIDINTCON0);
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irq_ctrl_reg &= ~VIDINTCON0_INT_FRAME;
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irq_ctrl_reg &= ~VIDINTCON0_INT_ENABLE;
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writel(irq_ctrl_reg, regs + VIDINTCON0);
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}
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}
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static irqreturn_t s3c_fb_irq(int irq, void *dev_id)
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{
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struct s3c_fb *sfb = dev_id;
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void __iomem *regs = sfb->regs;
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u32 irq_sts_reg;
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irq_sts_reg = readl(regs + VIDINTCON1);
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if (irq_sts_reg & VIDINTCON1_INT_FRAME) {
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/* VSYNC interrupt, accept it */
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writel(VIDINTCON1_INT_FRAME, regs + VIDINTCON1);
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sfb->vsync_info.count++;
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wake_up_interruptible(&sfb->vsync_info.wait);
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}
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/* We only support waiting for VSYNC for now, so it's safe
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* to always disable irqs here.
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*/
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s3c_fb_disable_irq(sfb);
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return IRQ_HANDLED;
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}
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/**
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* s3c_fb_wait_for_vsync() - sleep until next VSYNC interrupt or timeout
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* @sfb: main hardware state
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* @crtc: head index.
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*/
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static int s3c_fb_wait_for_vsync(struct s3c_fb *sfb, u32 crtc)
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{
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unsigned long count;
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int ret;
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if (crtc != 0)
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return -ENODEV;
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count = sfb->vsync_info.count;
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s3c_fb_enable_irq(sfb);
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ret = wait_event_interruptible_timeout(sfb->vsync_info.wait,
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count != sfb->vsync_info.count,
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msecs_to_jiffies(VSYNC_TIMEOUT_MSEC));
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if (ret == 0)
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return -ETIMEDOUT;
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return 0;
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}
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static int s3c_fb_ioctl(struct fb_info *info, unsigned int cmd,
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unsigned long arg)
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{
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struct s3c_fb_win *win = info->par;
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struct s3c_fb *sfb = win->parent;
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int ret;
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u32 crtc;
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switch (cmd) {
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case FBIO_WAITFORVSYNC:
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if (get_user(crtc, (u32 __user *)arg)) {
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ret = -EFAULT;
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break;
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}
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ret = s3c_fb_wait_for_vsync(sfb, crtc);
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break;
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default:
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ret = -ENOTTY;
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}
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return ret;
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}
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static struct fb_ops s3c_fb_ops = {
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.owner = THIS_MODULE,
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.fb_check_var = s3c_fb_check_var,
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@ -808,6 +950,7 @@ static struct fb_ops s3c_fb_ops = {
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_pan_display = s3c_fb_pan_display,
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.fb_ioctl = s3c_fb_ioctl,
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};
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/**
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@ -914,6 +1057,8 @@ static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
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dev_dbg(sfb->dev, "probing window %d, variant %p\n", win_no, variant);
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init_waitqueue_head(&sfb->vsync_info.wait);
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palette_size = variant->palette_sz * 4;
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fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
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@ -1093,6 +1238,20 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev)
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goto err_req_region;
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}
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res) {
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dev_err(dev, "failed to acquire irq resource\n");
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ret = -ENOENT;
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goto err_ioremap;
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}
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sfb->irq_no = res->start;
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ret = request_irq(sfb->irq_no, s3c_fb_irq,
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0, "s3c_fb", sfb);
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if (ret) {
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dev_err(dev, "irq request failed\n");
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goto err_ioremap;
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}
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dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
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/* setup gpio and output polarity controls */
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@ -1127,7 +1286,7 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev)
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dev_err(dev, "failed to create window %d\n", win);
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for (; win >= 0; win--)
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s3c_fb_release_win(sfb, sfb->windows[win]);
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goto err_ioremap;
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goto err_irq;
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}
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}
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@ -1135,6 +1294,9 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev)
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return 0;
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err_irq:
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free_irq(sfb->irq_no, sfb);
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err_ioremap:
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iounmap(sfb->regs);
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@ -1167,6 +1329,8 @@ static int __devexit s3c_fb_remove(struct platform_device *pdev)
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if (sfb->windows[win])
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s3c_fb_release_win(sfb, sfb->windows[win]);
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free_irq(sfb->irq_no, sfb);
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iounmap(sfb->regs);
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clk_disable(sfb->bus_clk);
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