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

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Date:   Sat, 24 Dec 2022 13:13:11 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Wesley Cheng <quic_wcheng@...cinc.com>
Cc:     srinivas.kandagatla@...aro.org, mathias.nyman@...el.com,
        perex@...ex.cz, broonie@...nel.org, lgirdwood@...il.com,
        andersson@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        gregkh@...uxfoundation.org, Thinh.Nguyen@...opsys.com,
        bgoswami@...cinc.com, tiwai@...e.com, robh+dt@...nel.org,
        agross@...nel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
        quic_jackp@...cinc.com, quic_plai@...cinc.com
Subject: Re: [RFC PATCH 08/14] usb: dwc3: Add DT parameter to specify maximum
 number of interrupters

On Sat, 24 Dec 2022 at 01:33, Wesley Cheng <quic_wcheng@...cinc.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@...cinc.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?

> +       /* DWC3 core allowed to have a max of 8 interrupters */
> +       if (num_hc_interrupters > 8)
> +               num_hc_interrupters = 8;
> +
>         dwc->do_fifo_resize = device_property_read_bool(dev,
>                                                         "tx-fifo-resize");
>         if (dwc->do_fifo_resize)
> @@ -1589,6 +1599,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>         dwc->imod_interval = 0;
>
>         dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num;
> +
> +       dwc->num_hc_interrupters = num_hc_interrupters;
>  }
>
>  /* check whether the core supports IMOD */
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 8f9959ba9fd4..09037299da53 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1050,6 +1050,7 @@ struct dwc3_scratchpad_array {
>   * @tx_max_burst_prd: max periodic ESS transmit burst size
>   * @tx_fifo_resize_max_num: max number of fifos allocated during txfifo resize
>   * @clear_stall_protocol: endpoint number that requires a delayed status phase
> + * @num_hc_interrupters: number of host controller interrupters
>   * @hsphy_interface: "utmi" or "ulpi"
>   * @connected: true when we're connected to a host, false otherwise
>   * @softconnect: true when gadget connect is called, false when disconnect runs
> @@ -1275,6 +1276,7 @@ struct dwc3 {
>         u8                      tx_max_burst_prd;
>         u8                      tx_fifo_resize_max_num;
>         u8                      clear_stall_protocol;
> +       u8                      num_hc_interrupters;
>
>         const char              *hsphy_interface;
>
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index f6f13e7f1ba1..52a284fdd704 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -66,7 +66,7 @@ static int dwc3_host_get_irq(struct dwc3 *dwc)
>
>  int dwc3_host_init(struct dwc3 *dwc)
>  {
> -       struct property_entry   props[4];
> +       struct property_entry   props[5];
>         struct platform_device  *xhci;
>         int                     ret, irq;
>         int                     prop_idx = 0;
> @@ -112,6 +112,9 @@ int dwc3_host_init(struct dwc3 *dwc)
>         if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
>                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
>
> +       props[prop_idx++] = PROPERTY_ENTRY_U8("num-hc-interrupters",
> +                                                               dwc->num_hc_interrupters);
> +
>         if (prop_idx) {
>                 ret = device_create_managed_software_node(&xhci->dev, props, NULL);
>                 if (ret) {



-- 
With best wishes
Dmitry