On Mon, 2015-03-02 at 19:09 +0000, Arun Ramamurthy wrote:
> On 15-03-02 08:00 AM, Pawel Moll wrote:
> > On Wed, 2015-02-25 at 21:01 +0000, Arun Ramamurthy wrote:
> >> Added ioctl and interrupt handler functions to support FBIO_WAITFORVSYNC
> >> Also corrected documentation to make interrupts and interrupt-names
> >> optional as they are not required properties.
> >
> > You may not be aware of this fact, but its the "documentation" what
> > defines what properties are required...
> >
> Pawel, I was not aware of that. Since the driver code did not require
> the interrupts or interrupt-names bindings to load properly, I moved it
> out of the required properties. I can remove that change.
Cool. Drivers don't have to use all available properties :-) The
interrupt names are required because CLCD can be wired up with a single,
combined interrupt or with 4 separate interrupt lines (see "A.4. On-chip
signals", in the TRM) and the binding has to provide ways of describing
this. Yes, one could say "1 number == combined, 4 numbers == split", but
I personally prefer to be explicit than implicit.
Just request the interrupt by name and you'll be fine.
> Any other comments on this change? Thanks
I have no experience with the vsync ioctl, so can't really comment on
it. One minor thing I did spot is your use of curly brackets in one of
the switch cases:
On Wed, 2015-02-25 at 21:01 +0000, Arun Ramamurthy wrote:
@@ -466,6 +468,73 @@ static int clcdfb_pan_display(struct fb_var_screeninfo *var,
> return 0;
> }
>
> +static int clcdfb_ioctl(struct fb_info *info,
> + unsigned int cmd, unsigned long args)
> +{
> + struct clcd_fb *fb = to_clcd(info);
> + int retval = 0;
> + u32 val, ienb_val;
> +
> + switch (cmd) {
> + case FBIO_WAITFORVSYNC:{
In the line above...
> + if (fb->lcd_irq <= 0) {
> + retval = -EINVAL;
> + break;
> + }
> + /* disable Vcomp interrupts */
> + ienb_val = readl(fb->regs + fb->off_ienb);
> + ienb_val &= ~CLCD_PL111_IENB_VCOMP;
> + writel(ienb_val, fb->regs + fb->off_ienb);
> +
> + /* clear Vcomp interrupt */
> + writel(CLCD_PL111_IENB_VCOMP, fb->regs + CLCD_PL111_ICR);
> +
> + /* Generate Interrupt at the start of Vsync */
> + reinit_completion(&fb->wait);
> + val = readl(fb->regs + fb->off_cntl);
> + val &= ~(CNTL_LCDVCOMP(3));
> + writel(val, fb->regs + fb->off_cntl);
> +
> + /* enable Vcomp interrupt */
> + ienb_val = readl(fb->regs + fb->off_ienb);
> + ienb_val |= CLCD_PL111_IENB_VCOMP;
> + writel(ienb_val, fb->regs + fb->off_ienb);
> + if (!wait_for_completion_interruptible_timeout
> + (&fb->wait, HZ/10))
> + retval = -ETIMEDOUT;
> + break;
> + }
... and here.
Not sure it's needed?
Pawel
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