[PATCH] s3c-fb: Automatically calculate pixel clock when none is given
DORMANTno replies
From: Maurus Cuelenaere <hidden>
Date: 2010-07-13 00:03:58
Also in:
linux-samsung-soc
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
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 <redacted> --- 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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1.7.0.4