chipidea: usbmisc_imx: Allow USB OTG to work on mx51

The field PLLDIVVALUE of register PHY_CTRL_1 selects the reference clock source
for the PHY:
00 = sysclock uses 19.2 MHz
01 = sysclock uses 24 MHz
10 = sysclock uses 26 MHz
11 = sysclock uses 27 MHz

The reset value for this field is 10 according to the reference manual, and
even though this reset value works for mx53, it does not work for mx51.

So instead of relying on the reset value for the PLLDIVVALUE field, explicitly
set it to 01 so that a 24MHz clock can be selected for the PHY and allowing both
mx51 and mx53 to have USB OTG port functional.

Succesfully tested 'g_ether' on a imx51-babbage and on a imx53-qsb boards.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 419b8959d150..85293b8b1df9 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -46,11 +46,14 @@
 #define MX27_OTG_PM_BIT                 BIT(24)
 
 #define MX53_USB_OTG_PHY_CTRL_0_OFFSET  0x08
+#define MX53_USB_OTG_PHY_CTRL_1_OFFSET  0x0c
 #define MX53_USB_UH2_CTRL_OFFSET        0x14
 #define MX53_USB_UH3_CTRL_OFFSET        0x18
 #define MX53_BM_OVER_CUR_DIS_H1         BIT(5)
 #define MX53_BM_OVER_CUR_DIS_OTG        BIT(8)
 #define MX53_BM_OVER_CUR_DIS_UHx        BIT(30)
+#define MX53_USB_PHYCTRL1_PLLDIV_MASK   0x3
+#define MX53_USB_PLL_DIV_24_MHZ         0x01
 
 #define MX6_BM_OVER_CUR_DIS             BIT(7)
 
@@ -164,6 +167,13 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
         if (data->index > 3)
                 return -EINVAL;
 
+        /* Select a 24 MHz reference clock for the PHY  */
+        reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_1_OFFSET;
+        val = readl(reg);
+        val &= ~MX53_USB_PHYCTRL1_PLLDIV_MASK;
+        val |= MX53_USB_PLL_DIV_24_MHZ;
+        writel(val, usbmisc->base + MX53_USB_OTG_PHY_CTRL_1_OFFSET);
+
         if (data->disable_oc) {
                 spin_lock_irqsave(&usbmisc->lock, flags);
                 switch (data->index) {