I tested this patch by using s5pv210.
It is verified by linux-2.6.32.
The result of test is the same pixel clock as before applying patch.
Tested-by: Donghwa Lee <yiffie9819@xxxxxxxxx>
2010/7/13 Maurus Cuelenaere <mcuelenaere@xxxxxxxxx>
> This patch adds a simple algorithm which calculates the pixel clock based on the
> video mode parameters. This is only done when no pixel clock is supplied through
> the platform data.
>
> Signed-off-by: Maurus Cuelenaere <mcuelenaere@xxxxxxxxx>
> ---
>
> Changes since v1:
> Re-posted this to the correct fbdev mailing list.
>
> ---
> drivers/video/s3c-fb.c | 25 +++++++++++++++++++++++++
> 1 files changed, 25 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
> index 9682ecc..e4715eb 100644
> --- a/drivers/video/s3c-fb.c
> +++ b/drivers/video/s3c-fb.c
> @@ -654,6 +654,28 @@ static struct fb_ops s3c_fb_ops = {
> };
>
> /**
> + * s3c_fb_missing_pixclock() - calculates pixel clock
> + * @mode: The video mode to change.
> + *
> + * Calculate the pixel clock when none has been given through platform data.
> + */
> +static void __devinit s3c_fb_missing_pixclock(struct fb_videomode *mode)
> +{
> + u64 pixclk = 1000000000000ULL;
> + u32 div;
> +
> + div = mode->left_margin + mode->hsync_len + mode->right_margin +
> + mode->xres;
> + div *= mode->upper_margin + mode->vsync_len + mode->lower_margin +
> + mode->yres;
> + div *= mode->refresh ? : 60;
> +
> + do_div(pixclk, div);
> +
> + mode->pixclock = pixclk;
> +}
> +
> +/**
> * s3c_fb_alloc_memory() - allocate display memory for framebuffer window
> * @sfb: The base resources for the hardware.
> * @win: The window to initialise memory for.
> @@ -925,6 +947,9 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev)
> if (!pd->win[win])
> continue;
>
> + if (!pd->win[win]->win_mode.pixclock)
> + s3c_fb_missing_pixclock(&pd->win[win]->win_mode);
> +
> ret = s3c_fb_probe_win(sfb, win, &sfb->windows[win]);
> if (ret < 0) {
> dev_err(dev, "failed to create window %d\n", win);
--
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