52 lines
1.6 KiB
Diff
52 lines
1.6 KiB
Diff
From 0fd52df8bce3be9edbc195b120bc9a68f970d9e5 Mon Sep 17 00:00:00 2001
|
|
From: John Crispin <blogic@openwrt.org>
|
|
Date: Mon, 4 Aug 2014 20:43:25 +0200
|
|
Subject: [PATCH 08/53] MIPS: ralink: mt7620: fix usb issue during frequency
|
|
scaling
|
|
|
|
If the USB HCD is running and the cpu is scaled too low, then the USB stops
|
|
working. Increase the idle speed of the core to fix this if the kernel is
|
|
built with USB support.
|
|
|
|
The values are taken from the Ralink SDK Kernel.
|
|
|
|
Signed-off-by: John Crispin <blogic@openwrt.org>
|
|
---
|
|
arch/mips/ralink/mt7620.c | 19 +++++++++++++++++++
|
|
1 file changed, 19 insertions(+)
|
|
|
|
--- a/arch/mips/ralink/mt7620.c
|
|
+++ b/arch/mips/ralink/mt7620.c
|
|
@@ -40,6 +40,12 @@
|
|
/* is this a MT7620 or a MT7628 */
|
|
enum mt762x_soc_type mt762x_soc;
|
|
|
|
+/* clock scaling */
|
|
+#define CLKCFG_FDIV_MASK 0x1f00
|
|
+#define CLKCFG_FDIV_USB_VAL 0x0300
|
|
+#define CLKCFG_FFRAC_MASK 0x001f
|
|
+#define CLKCFG_FFRAC_USB_VAL 0x0003
|
|
+
|
|
/* does the board have sdram or ddram */
|
|
static int dram_type;
|
|
|
|
@@ -423,6 +429,19 @@ void __init ralink_clk_init(void)
|
|
ralink_clk_add("10000b00.spi", sys_rate);
|
|
ralink_clk_add("10000c00.uartlite", periph_rate);
|
|
ralink_clk_add("10180000.wmac", xtal_rate);
|
|
+
|
|
+ if (IS_ENABLED(CONFIG_USB)) {
|
|
+ /*
|
|
+ * When the CPU goes into sleep mode, the BUS clock will be too low for
|
|
+ * USB to function properly
|
|
+ */
|
|
+ u32 val = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);
|
|
+
|
|
+ val &= ~(CLKCFG_FDIV_MASK | CLKCFG_FFRAC_MASK);
|
|
+ val |= CLKCFG_FDIV_USB_VAL | CLKCFG_FFRAC_USB_VAL;
|
|
+
|
|
+ rt_sysc_w32(val, SYSC_REG_CPU_SYS_CLKCFG);
|
|
+ }
|
|
}
|
|
|
|
void __init ralink_of_remap(void)
|