usb: dwc3: qcom: Add interconnect support in dwc3 driver
Add interconnect support in dwc3-qcom driver to vote for bus bandwidth. This requires for two different paths - from USB to DDR. The other is from APPS to USB. Reviewed-by: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Sandeep Maheswaram <sanm@codeaurora.org> Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org> Signed-off-by: Felipe Balbi <balbi@kernel.org>
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@ -13,6 +13,7 @@
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/extcon.h>
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#include <linux/interconnect.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/phy/phy.h>
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@ -43,6 +44,14 @@
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#define SDM845_QSCRATCH_SIZE 0x400
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#define SDM845_DWC3_CORE_SIZE 0xcd00
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/* Interconnect path bandwidths in MBps */
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#define USB_MEMORY_AVG_HS_BW MBps_to_icc(240)
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#define USB_MEMORY_PEAK_HS_BW MBps_to_icc(700)
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#define USB_MEMORY_AVG_SS_BW MBps_to_icc(1000)
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#define USB_MEMORY_PEAK_SS_BW MBps_to_icc(2500)
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#define APPS_USB_AVG_BW 0
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#define APPS_USB_PEAK_BW MBps_to_icc(40)
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struct dwc3_acpi_pdata {
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u32 qscratch_base_offset;
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u32 qscratch_base_size;
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@ -76,6 +85,8 @@ struct dwc3_qcom {
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enum usb_dr_mode mode;
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bool is_suspended;
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bool pm_suspended;
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struct icc_path *icc_path_ddr;
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struct icc_path *icc_path_apps;
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};
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static inline void dwc3_qcom_setbits(void __iomem *base, u32 offset, u32 val)
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@ -190,6 +201,96 @@ static int dwc3_qcom_register_extcon(struct dwc3_qcom *qcom)
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return 0;
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}
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static int dwc3_qcom_interconnect_enable(struct dwc3_qcom *qcom)
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{
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int ret;
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ret = icc_enable(qcom->icc_path_ddr);
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if (ret)
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return ret;
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ret = icc_enable(qcom->icc_path_apps);
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if (ret)
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icc_disable(qcom->icc_path_ddr);
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return ret;
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}
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static int dwc3_qcom_interconnect_disable(struct dwc3_qcom *qcom)
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{
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int ret;
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ret = icc_disable(qcom->icc_path_ddr);
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if (ret)
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return ret;
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ret = icc_disable(qcom->icc_path_apps);
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if (ret)
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icc_enable(qcom->icc_path_ddr);
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return ret;
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}
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/**
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* dwc3_qcom_interconnect_init() - Get interconnect path handles
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* and set bandwidhth.
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* @qcom: Pointer to the concerned usb core.
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*
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*/
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static int dwc3_qcom_interconnect_init(struct dwc3_qcom *qcom)
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{
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struct device *dev = qcom->dev;
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int ret;
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qcom->icc_path_ddr = of_icc_get(dev, "usb-ddr");
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if (IS_ERR(qcom->icc_path_ddr)) {
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dev_err(dev, "failed to get usb-ddr path: %ld\n",
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PTR_ERR(qcom->icc_path_ddr));
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return PTR_ERR(qcom->icc_path_ddr);
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}
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qcom->icc_path_apps = of_icc_get(dev, "apps-usb");
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if (IS_ERR(qcom->icc_path_apps)) {
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dev_err(dev, "failed to get apps-usb path: %ld\n",
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PTR_ERR(qcom->icc_path_apps));
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return PTR_ERR(qcom->icc_path_apps);
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}
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if (usb_get_maximum_speed(&qcom->dwc3->dev) >= USB_SPEED_SUPER ||
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usb_get_maximum_speed(&qcom->dwc3->dev) == USB_SPEED_UNKNOWN)
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ret = icc_set_bw(qcom->icc_path_ddr,
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USB_MEMORY_AVG_SS_BW, USB_MEMORY_PEAK_SS_BW);
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else
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ret = icc_set_bw(qcom->icc_path_ddr,
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USB_MEMORY_AVG_HS_BW, USB_MEMORY_PEAK_HS_BW);
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if (ret) {
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dev_err(dev, "failed to set bandwidth for usb-ddr path: %d\n", ret);
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return ret;
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}
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ret = icc_set_bw(qcom->icc_path_apps,
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APPS_USB_AVG_BW, APPS_USB_PEAK_BW);
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if (ret) {
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dev_err(dev, "failed to set bandwidth for apps-usb path: %d\n", ret);
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return ret;
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}
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return 0;
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}
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/**
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* dwc3_qcom_interconnect_exit() - Release interconnect path handles
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* @qcom: Pointer to the concerned usb core.
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*
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* This function is used to release interconnect path handle.
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*/
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static void dwc3_qcom_interconnect_exit(struct dwc3_qcom *qcom)
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{
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icc_put(qcom->icc_path_ddr);
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icc_put(qcom->icc_path_apps);
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}
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static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
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{
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if (qcom->hs_phy_irq) {
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@ -239,7 +340,7 @@ static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
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static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
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{
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u32 val;
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int i;
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int i, ret;
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if (qcom->is_suspended)
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return 0;
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@ -251,6 +352,10 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
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for (i = qcom->num_clocks - 1; i >= 0; i--)
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clk_disable_unprepare(qcom->clks[i]);
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ret = dwc3_qcom_interconnect_disable(qcom);
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if (ret)
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dev_warn(qcom->dev, "failed to disable interconnect: %d\n", ret);
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qcom->is_suspended = true;
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dwc3_qcom_enable_interrupts(qcom);
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@ -276,6 +381,10 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
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}
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}
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ret = dwc3_qcom_interconnect_enable(qcom);
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if (ret)
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dev_warn(qcom->dev, "failed to enable interconnect: %d\n", ret);
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/* Clear existing events from PHY related to L2 in/out */
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dwc3_qcom_setbits(qcom->qscratch_base, PWR_EVNT_IRQ_STAT_REG,
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PWR_EVNT_LPM_IN_L2_MASK | PWR_EVNT_LPM_OUT_L2_MASK);
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@ -638,6 +747,10 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
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goto depopulate;
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}
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ret = dwc3_qcom_interconnect_init(qcom);
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if (ret)
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goto depopulate;
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qcom->mode = usb_get_dr_mode(&qcom->dwc3->dev);
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/* enable vbus override for device mode */
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@ -647,7 +760,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
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/* register extcon to override sw_vbus on Vbus change later */
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ret = dwc3_qcom_register_extcon(qcom);
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if (ret)
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goto depopulate;
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goto interconnect_exit;
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device_init_wakeup(&pdev->dev, 1);
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qcom->is_suspended = false;
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@ -657,6 +770,8 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
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return 0;
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interconnect_exit:
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dwc3_qcom_interconnect_exit(qcom);
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depopulate:
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if (np)
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of_platform_depopulate(&pdev->dev);
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@ -687,6 +802,7 @@ static int dwc3_qcom_remove(struct platform_device *pdev)
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}
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qcom->num_clocks = 0;
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dwc3_qcom_interconnect_exit(qcom);
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reset_control_assert(qcom->resets);
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pm_runtime_allow(dev);
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