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authorRanjani Vaidyanathan <ra5478@freescale.com>2012-08-23 22:57:50 -0500
committerXinyu Chen <xinyu.chen@freescale.com>2012-08-24 13:37:17 +0800
commite61df589a843d28483c6d94a9d7c0b3517e6e832 (patch)
treebcf70d3916244e090dbca003b4f43db3c2403a24
parentac8f43ae39627e6ddb2072521fc8b6014c48e7cd (diff)
ENGR00221277 MX6DL/S - Set AXI clock to 270MHzimx-android-r13.4-beta
Change AXI_CLK to be sourced from PLL3_PFD1_540MHz, so that it can run at 270MHz on MX6DL/S. This is required for improving VPU performance. Change AXI_CLK to be sourced from periph_clk just before the DDR freq is going to be dropped to 24MHz/50MHz. Change it back to PLL3_PFD1_540 when the DDR freq is back at 400MHz. Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
-rw-r--r--arch/arm/mach-mx6/bus_freq.c21
-rw-r--r--arch/arm/mach-mx6/clock.c3
2 files changed, 23 insertions, 1 deletions
diff --git a/arch/arm/mach-mx6/bus_freq.c b/arch/arm/mach-mx6/bus_freq.c
index 06454112eae3..9304c48361fa 100644
--- a/arch/arm/mach-mx6/bus_freq.c
+++ b/arch/arm/mach-mx6/bus_freq.c
@@ -101,6 +101,7 @@ static struct clk *pll3_sw_clk;
static struct clk *pll2_200;
static struct clk *mmdc_ch0_axi;
struct regulator *vddsoc_cap_regulator;
+static struct clk *pll3_540;
static struct delayed_work low_bus_freq_handler;
@@ -120,6 +121,14 @@ static void reduce_bus_freq_handler(struct work_struct *work)
}
if (!cpu_is_mx6sl()) {
+ if (cpu_is_mx6dl() &&
+ (clk_get_parent(axi_clk) != periph_clk))
+ /* Set the axi_clk to be sourced from the periph_clk.
+ * So that its frequency can be lowered down to 50MHz
+ * or 24MHz as the case may be.
+ */
+ clk_set_parent(axi_clk, periph_clk);
+
clk_enable(pll3);
if (lp_audio_freq) {
/* Need to ensure that PLL2_PFD_400M is kept ON. */
@@ -303,6 +312,11 @@ int set_high_bus_freq(int high_bus_freq)
if (audio_bus_freq_mode)
clk_disable(pll2_400);
+ /* AXI_CLK is sourced from PLL3_PFD_540 on MX6DL */
+ if (cpu_is_mx6dl() &&
+ clk_get_parent(axi_clk) != pll3_540)
+ clk_set_parent(axi_clk, pll3_540);
+
clk_disable(pll3);
}
@@ -513,6 +527,13 @@ static int __devinit busfreq_probe(struct platform_device *pdev)
return PTR_ERR(pll3);
}
+ pll3_540 = clk_get(NULL, "pll3_pfd_540M");
+ if (IS_ERR(pll3_540)) {
+ printk(KERN_DEBUG "%s: failed to get periph_clk\n",
+ __func__);
+ return PTR_ERR(pll3_540);
+ }
+
pll3_sw_clk = clk_get(NULL, "pll3_sw_clk");
if (IS_ERR(pll3_sw_clk)) {
printk(KERN_DEBUG "%s: failed to get pll3_sw_clk\n",
diff --git a/arch/arm/mach-mx6/clock.c b/arch/arm/mach-mx6/clock.c
index 7fa93d0bb5fd..93b60ac679e3 100644
--- a/arch/arm/mach-mx6/clock.c
+++ b/arch/arm/mach-mx6/clock.c
@@ -5398,14 +5398,15 @@ int __init mx6_clocks_init(unsigned long ckil, unsigned long osc,
/* pxp & epdc */
clk_set_parent(&ipu2_clk, &pll2_pfd_400M);
clk_set_rate(&ipu2_clk, 200000000);
+ clk_set_parent(&axi_clk, &pll3_pfd_540M);
} else if (cpu_is_mx6q()) {
clk_set_parent(&gpu3d_core_clk[0], &mmdc_ch0_axi_clk[0]);
clk_set_rate(&gpu3d_core_clk[0], 528000000);
clk_set_parent(&ipu2_clk, &mmdc_ch0_axi_clk[0]);
clk_set_parent(&ipu1_clk, &mmdc_ch0_axi_clk[0]);
+ clk_set_parent(&axi_clk, &periph_clk);
}
- clk_set_parent(&axi_clk, &periph_clk);
/* Need to keep PLL3_PFD_540M enabled until AXI is sourced from it. */
clk_enable(&axi_clk);