Hi Amelie,
On 11/27/2017 6:42 PM, Amelie Delaunay wrote:
> In case of OTG mode, with an OTG adapter plugged, the
> dwc2_check_param_tx_fifo_sizes function reads DPTXFSIZN registers while
> the controller is in Host mode, and, because DPTXFSIZN registers are
> Device specific registers, the values read are 0.
> Then, g_tx_fifo_size[fifo] values are considered invalid because in the
> comparison test, they need to be greater than min and lower than dptxfszn
> which is 0.
> To fix this issue, force the controller in device mode if needed before
> reading the DPTXFSIZN registers, and restore the previous mode if needed
> after reading.
>
> Fixes: 3c6aea7344c3 ("usb: dwc2: gadget: Add checking for g-tx-fifo-size
> parameter")
> Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx>
> ---
> drivers/usb/dwc2/params.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
> index ef73af6..302fefb 100644
> --- a/drivers/usb/dwc2/params.c
> +++ b/drivers/usb/dwc2/params.c
> @@ -469,6 +469,7 @@ static void dwc2_check_param_tx_fifo_sizes(struct dwc2_hsotg *hsotg)
> int fifo;
> int min;
> u32 total = 0;
> + bool forced;
> u32 dptxfszn;
>
> fifo_count = dwc2_hsotg_tx_fifo_count(hsotg);
> @@ -483,6 +484,12 @@ static void dwc2_check_param_tx_fifo_sizes(struct dwc2_hsotg *hsotg)
> dwc2_set_param_tx_fifo_sizes(hsotg);
> }
>
> + /*
> + * Reading DPTXFSIZN registers requires the controller to be in device
> + * mode. The mode will be forced, if necessary, to read these values.
> + */
> + forced = dwc2_force_mode_if_needed(hsotg, false);
> +
> for (fifo = 1; fifo <= fifo_count; fifo++) {
> dptxfszn = (dwc2_readl(hsotg->regs + DPTXFSIZN(fifo)) &
> FIFOSIZE_DEPTH_MASK) >> FIFOSIZE_DEPTH_SHIFT;
> @@ -495,6 +502,9 @@ static void dwc2_check_param_tx_fifo_sizes(struct dwc2_hsotg *hsotg)
> hsotg->params.g_tx_fifo_size[fifo] = dptxfszn;
> }
> }
> +
> + if (forced)
> + dwc2_clear_force_mode(hsotg);
> }
>
> #define CHECK_RANGE(_param, _min, _max, _def) do { \
>
I'll recommend to use "[PATCH] usb: dwc2: Fix TxFIFOn sizes and total
TxFIFO size issues" instead.
Thanks,
Minas
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