ARM: mach-shmobile: optimize PLLC2 frequency for HDMI

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>

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/board-ap4evb.c b/arch/arm/mach-shmobile/board-ap4evb.c
index 32d9e2816e5..732baed0857 100644
--- a/arch/arm/mach-shmobile/board-ap4evb.c
+++ b/arch/arm/mach-shmobile/board-ap4evb.c
@@ -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",