[PATCH v9 03/20] mfd: omap-usb-tll: Fix channel count detection

Roger Quadros rogerq at ti.com
Wed Jan 23 05:37:55 EST 2013


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 at ti.com>
Reviewed-by: Felipe Balbi <balbi at ti.com>
---
 drivers/mfd/omap-usb-tll.c |   20 +++++++++++---------
 1 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
index e459489..9658e18 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);
-- 
1.7.4.1




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