[PATCH 4/4 v2] ARM: mach-shmobile: optimize PLLC2 frequency for HDMI
DORMANTno replies
From: Guennadi Liakhovetski <hidden>
Date: 2010-11-02 11:27:34
Also in:
linux-sh
Subsystem:
arm port, arm/risc-v/renesas architecture, the rest · Maintainers:
Russell King, Geert Uytterhoeven, Magnus Damm, Linus Torvalds
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 <redacted> --- v2: now using the generic sh clock-framework function arch/arm/mach-shmobile/board-ap4evb.c | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-shmobile/board-ap4evb.c b/arch/arm/mach-shmobile/board-ap4evb.c
index 46ca4d4..f01ba9f 100644
--- a/arch/arm/mach-shmobile/board-ap4evb.c
+++ b/arch/arm/mach-shmobile/board-ap4evb.c@@ -631,9 +631,13 @@ 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, + .clk_optimize_parent = ap4evb_clk_optimize, }; static struct resource hdmi_resources[] = {
@@ -660,6 +664,25 @@ 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",
--
1.7.2.3