Re: [RFC PATCH 08/14] usb: dwc3: Add DT parameter to specify maximum number of interrupters

Wesley Cheng
2022-12-27T21:11:05Z

Hi Dmitry,

On 12/24/2022 3:13 AM, Dmitry Baryshkov wrote:
> On Sat, 24 Dec 2022 at 01:33, Wesley Cheng <quic_wcheng@quicinc.com> wrote:
>>
>> Allow for the DWC3 host driver to pass along a XHCI property that defines
>> how many interrupters to allocate. This is in relation for the number of
>> event rings that can be potentially used by other processors within the
>> system.
>>
>> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
>> ---
>> drivers/usb/dwc3/core.c | 12 ++++++++++++
>> drivers/usb/dwc3/core.h | 2 ++
>> drivers/usb/dwc3/host.c | 5 ++++-
>> 3 files changed, 18 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index 476b63618511..67d6f0ae81d2 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -1446,6 +1446,7 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>> u8 tx_thr_num_pkt_prd = 0;
>> u8 tx_max_burst_prd = 0;
>> u8 tx_fifo_resize_max_num;
>> + u8 num_hc_interrupters;
>> const char *usb_psy_name;
>> int ret;
>>
>> @@ -1468,6 +1469,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>> */
>> tx_fifo_resize_max_num = 6;
>>
>> + /* default to a single XHCI interrupter */
>> + num_hc_interrupters = 1;
>> +
>> dwc->maximum_speed = usb_get_maximum_speed(dev);
>> dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev);
>> dwc->dr_mode = usb_get_dr_mode(dev);
>> @@ -1511,6 +1515,12 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>> &tx_thr_num_pkt_prd);
>> device_property_read_u8(dev, "snps,tx-max-burst-prd",
>> &tx_max_burst_prd);
>> + device_property_read_u8(dev, "snps,num-hc-interrupters",
>> + &num_hc_interrupters);
>
> bindings change?
>

Will add one. Thanks!

Thanks
Wesley Cheng