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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2011-08-29 15:56:36 +0400
committerFelipe Balbi <balbi@ti.com>2011-09-09 14:02:09 +0400
commit7650bd74d3441907867276dc381b2ee0dc355c65 (patch)
treec3478d45ed646a0bf5b3dd18fd8f0f8902ce40ff /drivers/usb/dwc3/core.c
parente7225315a89731d0f986c20165184f1dc9a9bf2b (diff)
downloadlinux-7650bd74d3441907867276dc381b2ee0dc355c65.tar.xz
usb: dwc3: core: move the core check before soft reset
We read the DWC3_GSNPSID register to make sure we got the correct register offset passed. One of the recent commits moved the soft reset before this so in case of the wrong offset we end up with "reset timed out". This patch moves the "id" check before the reset again. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/dwc3/core.c')
-rw-r--r--drivers/usb/dwc3/core.c19
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 443e4fb9b8f3..6aa091339989 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -241,6 +241,15 @@ static int __devinit dwc3_core_init(struct dwc3 *dwc)
u32 reg;
int ret;
+ reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
+ /* This should read as U3 followed by revision number */
+ if ((reg & DWC3_GSNPSID_MASK) != 0x55330000) {
+ dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
+ ret = -ENODEV;
+ goto err0;
+ }
+ dwc->revision = reg & DWC3_GSNPSREV_MASK;
+
dwc3_core_soft_reset(dwc);
/* issue device SoftReset too */
@@ -260,16 +269,6 @@ static int __devinit dwc3_core_init(struct dwc3 *dwc)
cpu_relax();
} while (true);
- reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
- /* This should read as U3 followed by revision number */
- if ((reg & DWC3_GSNPSID_MASK) != 0x55330000) {
- dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
- ret = -ENODEV;
- goto err0;
- }
-
- dwc->revision = reg & DWC3_GSNPSREV_MASK;
-
ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_NUM,
DWC3_EVENT_BUFFERS_SIZE);
if (ret) {