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ARM: mach-shmobile: optimize PLLC2 frequency for HDMI

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On ap4evb PLLC2 is only used as a parent of the HDMI clock, therefore it can
be reconfigured freely to improve HDMI clock precision.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Guennadi Liakhovetski 2010-11-02 11:27:34 +00:00 committed by Paul Mundt
parent c724d07a56
commit 640dcfa0ff
1 changed files with 24 additions and 0 deletions
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24
arch/arm/mach-shmobile/board-ap4evb.c
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@ -669,10 +669,15 @@ static struct platform_device lcdc1_device = {
},
};
static long ap4evb_clk_optimize(unsigned long target, unsigned long *best_freq,
unsigned long *parent_freq);
static struct sh_mobile_hdmi_info hdmi_info = {
.lcd_chan = &sh_mobile_lcdc1_info.ch[0],
.lcd_dev = &lcdc1_device.dev,
.flags = HDMI_SND_SRC_SPDIF,
.clk_optimize_parent = ap4evb_clk_optimize,
};
static struct resource hdmi_resources[] = {
@ -699,6 +704,25 @@ static struct platform_device hdmi_device = {
},
};
static long ap4evb_clk_optimize(unsigned long target, unsigned long *best_freq,
unsigned long *parent_freq)
{
struct clk *hdmi_ick = clk_get(&hdmi_device.dev, "ick");
long error;
if (IS_ERR(hdmi_ick)) {
int ret = PTR_ERR(hdmi_ick);
pr_err("Cannot get HDMI ICK: %d\n", ret);
return ret;
}
error = clk_round_parent(hdmi_ick, target, best_freq, parent_freq, 1, 64);
clk_put(hdmi_ick);
return error;
}
static struct gpio_led ap4evb_leds[] = {
{
.name = "led4",