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usb: dwc2: reset dwc2 core before dwc2_get_hwparams() 

We initiate dwc2 usb controller in BIOS, dwc2_core_reset() should
be called before dwc2_get_hwparams() to reset core registers to
default value. Without this the FIFO setting might be incorrect
because calculating FIFO size need power-on value of
GRXFSIZ/GNPTXFSIZ/HPTXFSIZ registers.

This patch could avoid warnning massage like in rk3288 platform:
[    2.074764] dwc2 ff580000.usb: 256 invalid for
host_perio_tx_fifo_size. Check HW configuration.

Signed-off-by: Yunzhi Li <lyz@rock-chips.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Yunzhi Li 2015-12-17 11:14:26 -08:00 committed by Felipe Balbi
parent 991824677f
commit cebfdbf329
3 changed files with 8 additions and 1 deletions
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2
drivers/usb/dwc2/core.c
View File

@ -481,7 +481,7 @@ static void dwc2_init_fs_ls_pclk_sel(struct dwc2_hsotg *hsotg)
* Do core a soft reset of the core. Be careful with this because it
* resets all the internal state machines of the core.
*/
static int dwc2_core_reset(struct dwc2_hsotg *hsotg)
int dwc2_core_reset(struct dwc2_hsotg *hsotg)
{
u32 greset;
int count = 0;

1
drivers/usb/dwc2/core.h
View File

@ -880,6 +880,7 @@ enum dwc2_halt_status {
* The following functions support initialization of the core driver component
* and the DWC_otg controller
*/
extern int dwc2_core_reset(struct dwc2_hsotg *hsotg);
extern void dwc2_core_host_init(struct dwc2_hsotg *hsotg);
extern int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg);
extern int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, bool restore);

6
drivers/usb/dwc2/platform.c
View File

@ -456,6 +456,12 @@ static int dwc2_driver_probe(struct platform_device *dev)
if (retval)
return retval;
/*
* Reset before dwc2_get_hwparams() then it could get power-on real
* reset value form registers.
*/
dwc2_core_reset(hsotg);
/* Detect config values from hardware */
retval = dwc2_get_hwparams(hsotg);
if (retval)