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945a704fab
All modification made by update_kernel.sh in a fresh clone without existing toolchains. Build system: x86_64 Build-tested: ipq806x/R7800, bcm27xx/bcm2711 Run-tested: ipq806x/R7800 No dmesg regressions, everything functional Signed-off-by: John Audia <graysky@archlinux.us> Tested-by: Curtis Deptuck <curtdept@me.com> [x86/64]
131 lines
4.3 KiB
Diff
131 lines
4.3 KiB
Diff
From 61d471c8da972c7ebbaf63779bf8100ee1ec54eb Mon Sep 17 00:00:00 2001
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From: Ran Wang <ran.wang_1@nxp.com>
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Date: Wed, 16 Jan 2019 13:23:17 +0800
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Subject: [PATCH] usb: dwc3: Add workaround for host mode VBUS glitch when boot
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When DWC3 is set to host mode by programming register DWC3_GCTL, VBUS
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(or its control signal) will be turned on immediately on related Root Hub
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ports. Then, the VBUS is turned off for a little while(15us) when do xhci
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reset (conducted by xhci driver) and back to normal finally, we can
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observe a negative glitch of related signal happen.
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This VBUS glitch might cause some USB devices enumeration fail if kernel
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boot with them connected. Such as LS1012AFWRY/LS1043ARDB/LX2160AQDS
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/LS1088ARDB with Kingston 16GB USB2.0/Kingston USB3.0/JetFlash Transcend
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4GB USB2.0 drives. The fail cases include enumerated as full-speed device
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or report wrong device descriptor, etc.
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One SW workaround which can fix this is by programing all xhci PORTSC[PP]
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to 0 to turn off VBUS immediately after setting host mode in DWC3 driver
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(per signal measurement result, it will be too late to do it in
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xhci-plat.c or xhci.c). Then, after xhci reset complete in xhci driver,
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PORTSC[PP]s' value will back to 1 automatically and VBUS on at that time,
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no glitch happen and normal enumeration process has no impact.
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Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
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Reviewed-by: Peter Chen <peter.chen@nxp.com>
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---
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drivers/usb/dwc3/core.c | 3 +++
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drivers/usb/dwc3/core.h | 3 +++
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drivers/usb/dwc3/host.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 54 insertions(+)
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--- a/drivers/usb/dwc3/core.c
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+++ b/drivers/usb/dwc3/core.c
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@@ -1364,6 +1364,9 @@ static void dwc3_get_properties(struct d
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dwc->dis_split_quirk = device_property_read_bool(dev,
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"snps,dis-split-quirk");
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+ dwc->host_vbus_glitches = device_property_read_bool(dev,
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+ "snps,host-vbus-glitches");
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+
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dwc->lpm_nyet_threshold = lpm_nyet_threshold;
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dwc->tx_de_emphasis = tx_de_emphasis;
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--- a/drivers/usb/dwc3/core.h
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+++ b/drivers/usb/dwc3/core.h
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@@ -1048,6 +1048,8 @@ struct dwc3_scratchpad_array {
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* 3 - Reserved
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* @dis_metastability_quirk: set to disable metastability quirk.
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* @dis_split_quirk: set to disable split boundary.
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+ * @host_vbus_glitches: set to avoid vbus glitch during
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+ * xhci reset.
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* @imod_interval: set the interrupt moderation interval in 250ns
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* increments or 0 to disable.
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*/
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@@ -1243,6 +1245,8 @@ struct dwc3 {
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unsigned dis_split_quirk:1;
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+ unsigned host_vbus_glitches:1;
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+
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u16 imod_interval;
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};
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--- a/drivers/usb/dwc3/host.c
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+++ b/drivers/usb/dwc3/host.c
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@@ -9,8 +9,49 @@
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#include <linux/platform_device.h>
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+#include "../host/xhci.h"
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+
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#include "core.h"
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+
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+#define XHCI_HCSPARAMS1 0x4
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+#define XHCI_PORTSC_BASE 0x400
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+
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+/*
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+ * dwc3_power_off_all_roothub_ports - Power off all Root hub ports
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+ * @dwc3: Pointer to our controller context structure
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+ */
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+static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc)
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+{
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+ int i, port_num;
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+ u32 reg, op_regs_base, offset;
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+ void __iomem *xhci_regs;
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+
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+ /* xhci regs is not mapped yet, do it temperary here */
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+ if (dwc->xhci_resources[0].start) {
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+ xhci_regs = ioremap(dwc->xhci_resources[0].start,
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+ DWC3_XHCI_REGS_END);
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+ if (IS_ERR(xhci_regs)) {
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+ dev_err(dwc->dev, "Failed to ioremap xhci_regs\n");
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+ return;
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+ }
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+
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+ op_regs_base = HC_LENGTH(readl(xhci_regs));
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+ reg = readl(xhci_regs + XHCI_HCSPARAMS1);
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+ port_num = HCS_MAX_PORTS(reg);
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+
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+ for (i = 1; i <= port_num; i++) {
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+ offset = op_regs_base + XHCI_PORTSC_BASE + 0x10*(i-1);
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+ reg = readl(xhci_regs + offset);
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+ reg &= ~PORT_POWER;
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+ writel(reg, xhci_regs + offset);
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+ }
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+
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+ iounmap(xhci_regs);
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+ } else
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+ dev_err(dwc->dev, "xhci base reg invalid\n");
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+}
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+
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static int dwc3_host_get_irq(struct dwc3 *dwc)
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{
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struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
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@@ -50,6 +91,13 @@ int dwc3_host_init(struct dwc3 *dwc)
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struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
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int prop_idx = 0;
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+ /*
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+ * We have to power off all Root hub ports immediately after DWC3 set
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+ * to host mode to avoid VBUS glitch happen when xhci get reset later.
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+ */
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+ if (dwc->host_vbus_glitches)
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+ dwc3_power_off_all_roothub_ports(dwc);
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+
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irq = dwc3_host_get_irq(dwc);
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if (irq < 0)
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return irq;
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