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);
--
1.7.0.4
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