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atmel_lcdfb: fix pixclock divider calculation

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Fix divider calculation and allow CLKVAL = 0 (divisor 2)

It was not possible to get the clock value 0 (divisor 2) because
the test "<=0" force the BYPASS bit to be activated instead.

[[email protected]: coding-style fixes]
Signed-off-by: Nicolas Ferre <[email protected]>
Cc: Per Hedblom <[email protected]>
Cc: Roel Kluin <[email protected]>
Cc: Jan Weber <[email protected]>
Cc: Andrew Victor <[email protected]>
Cc: Haavard Skinnemoen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nicolas Ferre 2008-05-12 14:02:25 -07:00 • committed by Linus Torvalds
commit baf6332a23
1 changed files with 6 additions and 5 deletions
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11
drivers/video/atmel_lcdfb.c
View file

@ -441,14 +441,15 @@ static int atmel_lcdfb_set_par(struct fb_info *info)
value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
value = (value / 2) - 1;
dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n", value);
if (value <= 0) {
if (value < 2) {
dev_notice(info->device, "Bypassing pixel clock divider\n");
lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
} else {
lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, value << ATMEL_LCDC_CLKVAL_OFFSET);
value = (value / 2) - 1;
dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n",
value);
lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
value << ATMEL_LCDC_CLKVAL_OFFSET);
info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1)));
dev_dbg(info->device, " updated pixclk: %lu KHz\n",
PICOS2KHZ(info->var.pixclock));