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authorTimur Tabi <timur@freescale.com>2011-06-23 20:20:26 +0000
committerPaul Mundt <lethal@linux-sh.org>2011-06-24 17:08:49 +0900
commit39785eb1d3e6c58cc8bf8f6990956a58037ecc75 (patch)
treeb896a48b483803124c940ff99e7ffdfd4a4a171c /drivers/video
parent9377c51752970c305fae29ac634501fde44378cb (diff)
fsl-diu-fb: remove check for pixel clock ranges
The Freescale DIU framebuffer driver defines two constants, MIN_PIX_CLK and MAX_PIX_CLK, that are supposed to represent the lower and upper limits of the pixel clock. These values, however, are true only for one platform clock rate (533MHz) and only for the MPC8610. So the actual range for the pixel clock is chip-specific, which means the current values are almost always wrong. The chance of an out-of-range pixel clock being used are also remote. Rather than try to detect an out-of-range clock in the DIU driver, we depend on the board-specific pixel clock function (e.g. p1022ds_set_pixel_clock) to clamp the pixel clock to a supported value. Signed-off-by: Timur Tabi <timur@freescale.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fsl-diu-fb.c16
1 files changed, 0 insertions, 16 deletions
diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index bedf5be27f0..0acc7d65aea 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -555,8 +555,6 @@ static void adjust_aoi_size_position(struct fb_var_screeninfo *var,
static int fsl_diu_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
- unsigned long htotal, vtotal;
-
pr_debug("check_var xres: %d\n", var->xres);
pr_debug("check_var yres: %d\n", var->yres);
@@ -635,20 +633,6 @@ static int fsl_diu_check_var(struct fb_var_screeninfo *var,
break;
}
- /* If the pixclock is below the minimum spec'd value then set to
- * refresh rate for 60Hz since this is supported by most monitors.
- * Refer to Documentation/fb/ for calculations.
- */
- if ((var->pixclock < MIN_PIX_CLK) || (var->pixclock > MAX_PIX_CLK)) {
- htotal = var->xres + var->right_margin + var->hsync_len +
- var->left_margin;
- vtotal = var->yres + var->lower_margin + var->vsync_len +
- var->upper_margin;
- var->pixclock = (vtotal * htotal * 6UL) / 100UL;
- var->pixclock = KHZ2PICOS(var->pixclock);
- pr_debug("pixclock set for 60Hz refresh = %u ps\n",
- var->pixclock);
- }
var->height = -1;
var->width = -1;