On 11/23/2020 1:01 PM, Amelie Delaunay wrote:
> Link Power Management (LPM) on STM32MP15 OTG HS encounters instabilities
> with some Host controllers. OTG core fails to exit L1 state in 200us:
> "dwc2 49000000.usb-otg: Failed to exit L1 sleep state in 200us."
> Then the device is still not enumerated.
>
> To avoid this issue, disable Link Power Management on STM32MP15 HS OTG.
>
> Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@xxxxxxxxxxxx>
> ---
> drivers/usb/dwc2/params.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
> index 9e5dd7f3f2f6..92df3d620f7d 100644
> --- a/drivers/usb/dwc2/params.c
> +++ b/drivers/usb/dwc2/params.c
> @@ -194,6 +194,10 @@ static void dwc2_set_stm32mp15_hsotg_params(struct dwc2_hsotg *hsotg)
> p->host_perio_tx_fifo_size = 256;
> p->ahbcfg = GAHBCFG_HBSTLEN_INCR16 << GAHBCFG_HBSTLEN_SHIFT;
> p->power_down = DWC2_POWER_DOWN_PARAM_NONE;
> + p->lpm = false;
> + p->lpm_clock_gating = false;
> + p->besl = false;
> + p->hird_threshold_en = false;
> }
>
> const struct of_device_id dwc2_of_match_table[] = {
>
