mfd: omap-usb-tll: Fix channel count detection

Fix channel count detecion for REV2. Also, don't give up
if we don't recognize the IP Revision. We assume the default
number of channels (i.e. 3) for unrecognized IPs.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>

1 files changed, 11 insertions, 9 deletions

diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
index e45948969907..9658e1843334 100644
--- a/drivers/mfd/omap-usb-tll.c
+++ b/drivers/mfd/omap-usb-tll.c
@@ -98,6 +98,7 @@
 struct usbtll_omap {
         struct clk                              *usbtll_p1_fck;
         struct clk                              *usbtll_p2_fck;
+        int                                     nch;    /* num. of channels */
         struct usbhs_omap_platform_data         *pdata;
         /* secure the register updates */
         spinlock_t                              lock;
@@ -210,7 +211,7 @@ static int usbtll_omap_probe(struct platform_device *pdev)
         unsigned                                reg;
         unsigned long                           flags;
         int                                     ret = 0;
-        int                                     i, ver, count;
+        int                                     i, ver;
 
         dev_dbg(dev, "starting TI HSUSB TLL Controller\n");
 
@@ -262,16 +263,18 @@ static int usbtll_omap_probe(struct platform_device *pdev)
         ver =  usbtll_read(base, OMAP_USBTLL_REVISION);
         switch (ver) {
         case OMAP_USBTLL_REV1:
-        case OMAP_USBTLL_REV2:
-                count = OMAP_TLL_CHANNEL_COUNT;
+                tll->nch = OMAP_TLL_CHANNEL_COUNT;
                 break;
+        case OMAP_USBTLL_REV2:
         case OMAP_USBTLL_REV3:
-                count = OMAP_REV2_TLL_CHANNEL_COUNT;
+                tll->nch = OMAP_REV2_TLL_CHANNEL_COUNT;
                 break;
         default:
-                dev_err(dev, "TLL version failed\n");
-                ret = -ENODEV;
-                goto err_ioremap;
+                tll->nch = OMAP_TLL_CHANNEL_COUNT;
+                dev_dbg(dev,
+                 "USB TLL Rev : 0x%x not recognized, assuming %d channels\n",
+                        ver, tll->nch);
+                break;
         }
 
         if (is_ehci_tll_mode(pdata->port_mode[0]) ||
@@ -291,7 +294,7 @@ static int usbtll_omap_probe(struct platform_device *pdev)
                 usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);
 
                 /* Enable channels now */
-                for (i = 0; i < count; i++) {
+                for (i = 0; i < tll->nch; i++) {
                         reg = usbtll_read(base, OMAP_TLL_CHANNEL_CONF(i));
 
                         if (is_ohci_port(pdata->port_mode[i])) {
@@ -319,7 +322,6 @@ static int usbtll_omap_probe(struct platform_device *pdev)
                 }
         }
 
-err_ioremap:
         spin_unlock_irqrestore(&tll->lock, flags);
         iounmap(base);
         pm_runtime_put_sync(dev);