sunxi: musb: Re-init musb controller on repeated probe calls

With sunxi-musb musb_lowlevel_init() can fail when a charger; or no cable
is plugged into the otg port.

To avoid leaking the struct musb allocated by musb_init_controller()
on repeated musb_usb_probe() calls, we were caching its result.
But musb_init_controller() does more, such as calling sunxi_musb_init()
which enables the clocks.

Not calling sunxi_musb_init() causes the musb controller to stop working
after a "usb reset" since that calls musb_usb_remove() which disables the
clocks.

This commit fixes this by removing the caching of the struct returned
from musb_init_controller(), it replaces this by free-ing the allocated
memory in musb_usb_remove() and calling musb_usb_remove() on
musb_usb_probe() errors to ensure proper cleanup.

While at it also make musb_usb_probe() and musb_usb_remove() static.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 11 insertions, 9 deletions

diff --git a/drivers/usb/musb-new/sunxi.c b/drivers/usb/musb-new/sunxi.c
index dece781..469377f 100644
--- a/drivers/usb/musb-new/sunxi.c
+++ b/drivers/usb/musb-new/sunxi.c
@@ -201,7 +201,6 @@ static irqreturn_t sunxi_musb_interrupt(int irq, void *__hci)
 
 /* musb_core does not call enable / disable in a balanced manner <sigh> */
 static bool enabled = false;
-static struct musb *sunxi_musb;
 
 static int sunxi_musb_enable(struct musb *musb)
 {
@@ -309,7 +308,9 @@ static struct musb_hdrc_platform_data musb_plat = {
 };
 
 #ifdef CONFIG_USB_MUSB_HOST
-int musb_usb_probe(struct udevice *dev)
+static int musb_usb_remove(struct udevice *dev);
+
+static int musb_usb_probe(struct udevice *dev)
 {
 	struct musb_host_data *host = dev_get_priv(dev);
 	struct usb_bus_priv *priv = dev_get_uclass_priv(dev);
@@ -317,23 +318,21 @@ int musb_usb_probe(struct udevice *dev)
 
 	priv->desc_before_addr = true;
 
-	if (!sunxi_musb) {
-		sunxi_musb = musb_init_controller(&musb_plat, NULL,
-						  (void *)SUNXI_USB0_BASE);
-	}
-
-	host->host = sunxi_musb;
+	host->host = musb_init_controller(&musb_plat, NULL,
+					  (void *)SUNXI_USB0_BASE);
 	if (!host->host)
 		return -EIO;
 
 	ret = musb_lowlevel_init(host);
 	if (ret == 0)
 		printf("MUSB OTG\n");
+	else
+		musb_usb_remove(dev);
 
 	return ret;
 }
 
-int musb_usb_remove(struct udevice *dev)
+static int musb_usb_remove(struct udevice *dev)
 {
 	struct musb_host_data *host = dev_get_priv(dev);
 	struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
@@ -346,6 +345,9 @@ int musb_usb_remove(struct udevice *dev)
 #endif
 	clrbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_USB0);
 
+	free(host->host);
+	host->host = NULL;
+
 	return 0;
 }