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Date: Tue, 31 May 2022 17:56:05 +0530
From: Pavan Kondeti <quic_pkondeti@...cinc.com>
To: Harsh Agarwal <quic_harshq@...cinc.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Rob Herring <robh+dt@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
Felipe Balbi <balbi@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
<linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
<quic_ppratap@...cinc.com>, <quic_jackp@...cinc.com>
Subject: Re: [PATCH 3/3] usb: dwc3: Refactor PHY logic to support Multiport
Controller
Hi Harsh,
On Tue, May 31, 2022 at 01:50:17PM +0530, Harsh Agarwal wrote:
> Currently the DWC3 driver supports only single port controller
> which requires at most 2 PHYs ie HS and SS PHYs.
>
> But some SOCs have a "multiport" USB DWC3 controller where a
> single controller supports multiple ports and each port have
> their own PHYs. Refactor PHY logic to support the same.
>
> Signed-off-by: Harsh Agarwal <quic_harshq@...cinc.com>
> ---
> drivers/usb/dwc3/core.c | 400 +++++++++++++++++++++++++++++++++-------------
> drivers/usb/dwc3/core.h | 12 +-
> drivers/usb/dwc3/drd.c | 16 +-
> drivers/usb/dwc3/gadget.c | 4 +-
> 4 files changed, 305 insertions(+), 127 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 5734219..5cc799e 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -120,7 +120,7 @@ static void __dwc3_set_mode(struct work_struct *work)
> {
> struct dwc3 *dwc = work_to_dwc(work);
> unsigned long flags;
> - int ret;
> + int i, ret;
> u32 reg;
>
<snip>
> -static int dwc3_core_get_phy(struct dwc3 *dwc)
> +static struct usb_phy *dwc3_core_get_phy_by_handle_with_node(struct device *dev,
> + const char *phandle, u8 index, struct device_node *lookup_node)
> +{
> + struct device_node *node;
> + struct usb_phy *phy;
> +
> + node = of_parse_phandle(lookup_node, phandle, index);
> + if (!node) {
> + dev_err(dev, "failed to get %s phandle in %pOF node\n", phandle,
> + dev->of_node);
> + return ERR_PTR(-ENODEV);
> + }
> + phy = devm_usb_get_phy_by_node(dev, node, NULL);
> + of_node_put(node);
> + return phy;
> +}
Remove this function definition, since we moved this to PHY library.
> +
> +static int dwc3_count_phys(struct dwc3 *dwc, struct device_node *lookup_node)
> +{
> + int count;
> +
> + count = of_count_phandle_with_args(lookup_node, "phys", NULL);
> +
> + if (count == -ENOENT)
> + count = of_count_phandle_with_args(lookup_node, "usb-phy", NULL);
> +
> + if (count == 1) {
> + dwc->num_usb2_phy++;
> + } else if (count == 2) {
> + dwc->num_usb2_phy++;
> + dwc->num_usb3_phy++;
> + } else {
> + return count;
> + }
> + return 0;
> +}
> +
> +static int dwc3_extract_num_phys(struct dwc3 *dwc)
> +{
> + struct device_node *ports, *port;
> + int ret;
> +
> + /* Find if any "multiport" child is present inside DWC3*/
> + for_each_available_child_of_node(dwc->dev->of_node, ports) {
> + if (!strcmp(ports->name, "multiport"))
> + break;
> + }
> + if (!ports) {
> + dwc->num_usb2_phy = 1;
> + dwc->num_usb3_phy = 1;
> + } else {
> + for_each_available_child_of_node(ports, port) {
> + ret = dwc3_count_phys(dwc, port);
> + if (ret)
> + return ret;
If you break the loop, you have to call of_node_put() explicitly.
> + }
> + }
> + dev_info(dwc->dev, "Num of HS and SS PHY are %u %u\n", dwc->num_usb2_phy,
> + dwc->num_usb3_phy);
If I declare the multiport node don't specify any phys for any of the ports,
we end up coming here with dwc->num_usb2_phy = dwc->num_usb3_phy = 0. That is
a problem since we access dwc->usb2_phy[0] directly. Can we bail out in that
case?
> +
> + dwc->usb2_phy = devm_kzalloc(dwc->dev,
> + sizeof(*dwc->usb2_phy) * dwc->num_usb2_phy, GFP_KERNEL);
> + if (!dwc->usb2_phy)
> + return -ENOMEM;
> +
> + dwc->usb3_phy = devm_kzalloc(dwc->dev,
> + sizeof(*dwc->usb3_phy) * dwc->num_usb3_phy, GFP_KERNEL);
> + if (!dwc->usb3_phy)
> + return -ENOMEM;
> +
> + dwc->usb2_generic_phy = devm_kzalloc(dwc->dev,
> + sizeof(*dwc->usb2_generic_phy) * dwc->num_usb2_phy, GFP_KERNEL);
> + if (!dwc->usb2_generic_phy)
> + return -ENOMEM;
> +
> + dwc->usb3_generic_phy = devm_kzalloc(dwc->dev,
> + sizeof(*dwc->usb3_generic_phy) * dwc->num_usb3_phy, GFP_KERNEL);
> + if (!dwc->usb3_generic_phy)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +static int dwc3_core_get_phy_by_node(struct dwc3 *dwc,
> + struct device_node *lookup_node, int i)
> {
> struct device *dev = dwc->dev;
> - struct device_node *node = dev->of_node;
> - int ret;
> + int ret;
>
> - if (node) {
> - dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
> - dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
> + if (lookup_node) {
> + dwc->usb2_phy[i] = devm_of_usb_get_phy_by_phandle(dev,
> + "usb-phy", 0, lookup_node);
> + dwc->usb3_phy[i] = devm_of_usb_get_phy_by_phandle(dev,
> + "usb-phy", 1, lookup_node);
> } else {
> - dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> - dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
> + dwc->usb2_phy[i] = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> + dwc->usb3_phy[i] = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
> }
>
> - if (IS_ERR(dwc->usb2_phy)) {
> - ret = PTR_ERR(dwc->usb2_phy);
> + if (IS_ERR(dwc->usb2_phy[i])) {
> + ret = PTR_ERR(dwc->usb2_phy[i]);
> if (ret == -ENXIO || ret == -ENODEV)
> - dwc->usb2_phy = NULL;
> + dwc->usb2_phy[i] = NULL;
> else
> return dev_err_probe(dev, ret, "no usb2 phy configured\n");
> }
>
> - if (IS_ERR(dwc->usb3_phy)) {
> - ret = PTR_ERR(dwc->usb3_phy);
> + if (IS_ERR(dwc->usb3_phy[i])) {
> + ret = PTR_ERR(dwc->usb3_phy[i]);
> if (ret == -ENXIO || ret == -ENODEV)
> - dwc->usb3_phy = NULL;
> + dwc->usb3_phy[i] = NULL;
> else
> return dev_err_probe(dev, ret, "no usb3 phy configured\n");
> }
>
> - dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
> - if (IS_ERR(dwc->usb2_generic_phy)) {
> - ret = PTR_ERR(dwc->usb2_generic_phy);
> - if (ret == -ENOSYS || ret == -ENODEV)
> - dwc->usb2_generic_phy = NULL;
> + dwc->usb2_generic_phy[i] = devm_of_phy_get(dev, lookup_node, "usb2-phy");
> + if (IS_ERR(dwc->usb2_generic_phy[i])) {
> + ret = PTR_ERR(dwc->usb2_generic_phy[i]);
> + if (ret == -ENODEV)
> + dwc->usb2_generic_phy[i] = NULL;
> else
> return dev_err_probe(dev, ret, "no usb2 phy configured\n");
> }
>
> - dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
> - if (IS_ERR(dwc->usb3_generic_phy)) {
> - ret = PTR_ERR(dwc->usb3_generic_phy);
> - if (ret == -ENOSYS || ret == -ENODEV)
> - dwc->usb3_generic_phy = NULL;
> + dwc->usb3_generic_phy[i] = devm_of_phy_get(dev, lookup_node, "usb3-phy");
> + if (IS_ERR(dwc->usb3_generic_phy[i])) {
> + ret = PTR_ERR(dwc->usb3_generic_phy[i]);
> + if (ret == -ENODEV)
> + dwc->usb3_generic_phy[i] = NULL;
> else
> return dev_err_probe(dev, ret, "no usb3 phy configured\n");
> }
> + return 0;
> +}
> +
> +static int dwc3_core_get_phy(struct dwc3 *dwc)
> +{
> + struct device *dev = dwc->dev;
> + struct device_node *node = dev->of_node;
> + struct device_node *ports, *port;
> + int ret, i = 0;
> +
> + ret = dwc3_extract_num_phys(dwc);
> + if (ret) {
> + dev_err(dwc->dev, "Unable to extract number of PHYs\n");
> + return ret;
> + }
> +
> + /* Find if any "multiport" child is present inside DWC3*/
> + for_each_available_child_of_node(node, ports) {
> + if (!strcmp(ports->name, "multiport"))
> + break;
> + }
> +
> + if (!ports) {
> + ret = dwc3_core_get_phy_by_node(dwc, node, 0);
> + if (ret)
> + return ret;
> + } else {
> + for_each_available_child_of_node(ports, port) {
> + ret = dwc3_core_get_phy_by_node(dwc, port, i);
> + if (ret)
> + return ret;
> + i++;
> + }
> + }
>
How does this work actually for a case where I have 4 ports with hs_phy=4 and
ss_phy=2. Here we end up calling i = {0, 1, 2, 3} and accessing un-allocated
ss phy instances in dwc3_core_get_phy_by_node(). you should also handle the
case where first two ports are HS only and last two ports are both HS and SS.
Thanks,
Pavan
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