MIPS: ralink: 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 "magic" values are taken from the Ralink SDK Kernel.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11441/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/mips/ralink/mt7620.c b/arch/mips/ralink/mt7620.c
index f3a4a08f2e71..55ddf09d8676 100644
--- a/arch/mips/ralink/mt7620.c
+++ b/arch/mips/ralink/mt7620.c
@@ -37,6 +37,12 @@
 #define PMU1_CFG                0x8C
 #define DIG_SW_SEL              BIT(25)
 
+/* clock scaling */
+#define CLKCFG_FDIV_MASK        0x1f00
+#define CLKCFG_FDIV_USB_VAL     0x0300
+#define CLKCFG_FFRAC_MASK       0x001f
+#define CLKCFG_FFRAC_USB_VAL    0x0003
+
 /* EFUSE bits */
 #define EFUSE_MT7688            0x100000
 
@@ -432,6 +438,20 @@ 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) && is_mt76x8()) {
+                /*
+                 * When the CPU goes into sleep mode, the BUS clock will be
+                 * too low for USB to function properly. Adjust the busses
+                 * fractional divider to fix this
+                 */
+                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)