diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/820-usb-0009-usb-dwc3-Add-workaround-for-host-mode-VBUS-glitch-wh.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/820-usb-0009-usb-dwc3-Add-workaround-for-host-mode-VBUS-glitch-wh.patch | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/target/linux/layerscape/patches-5.4/820-usb-0009-usb-dwc3-Add-workaround-for-host-mode-VBUS-glitch-wh.patch b/target/linux/layerscape/patches-5.4/820-usb-0009-usb-dwc3-Add-workaround-for-host-mode-VBUS-glitch-wh.patch deleted file mode 100644 index 82e2a25e2d..0000000000 --- a/target/linux/layerscape/patches-5.4/820-usb-0009-usb-dwc3-Add-workaround-for-host-mode-VBUS-glitch-wh.patch +++ /dev/null @@ -1,130 +0,0 @@ -From 61d471c8da972c7ebbaf63779bf8100ee1ec54eb Mon Sep 17 00:00:00 2001 -From: Ran Wang <ran.wang_1@nxp.com> -Date: Wed, 16 Jan 2019 13:23:17 +0800 -Subject: [PATCH] usb: dwc3: Add workaround for host mode VBUS glitch when boot - -When DWC3 is set to host mode by programming register DWC3_GCTL, VBUS -(or its control signal) will be turned on immediately on related Root Hub -ports. Then, the VBUS is turned off for a little while(15us) when do xhci -reset (conducted by xhci driver) and back to normal finally, we can -observe a negative glitch of related signal happen. - -This VBUS glitch might cause some USB devices enumeration fail if kernel -boot with them connected. Such as LS1012AFWRY/LS1043ARDB/LX2160AQDS -/LS1088ARDB with Kingston 16GB USB2.0/Kingston USB3.0/JetFlash Transcend -4GB USB2.0 drives. The fail cases include enumerated as full-speed device -or report wrong device descriptor, etc. - -One SW workaround which can fix this is by programing all xhci PORTSC[PP] -to 0 to turn off VBUS immediately after setting host mode in DWC3 driver -(per signal measurement result, it will be too late to do it in -xhci-plat.c or xhci.c). Then, after xhci reset complete in xhci driver, -PORTSC[PP]s' value will back to 1 automatically and VBUS on at that time, -no glitch happen and normal enumeration process has no impact. - -Signed-off-by: Ran Wang <ran.wang_1@nxp.com> -Reviewed-by: Peter Chen <peter.chen@nxp.com> ---- - drivers/usb/dwc3/core.c | 3 +++ - drivers/usb/dwc3/core.h | 3 +++ - drivers/usb/dwc3/host.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ - 3 files changed, 54 insertions(+) - ---- a/drivers/usb/dwc3/core.c -+++ b/drivers/usb/dwc3/core.c -@@ -1364,6 +1364,9 @@ static void dwc3_get_properties(struct d - dwc->dis_split_quirk = device_property_read_bool(dev, - "snps,dis-split-quirk"); - -+ dwc->host_vbus_glitches = device_property_read_bool(dev, -+ "snps,host-vbus-glitches"); -+ - dwc->lpm_nyet_threshold = lpm_nyet_threshold; - dwc->tx_de_emphasis = tx_de_emphasis; - ---- a/drivers/usb/dwc3/core.h -+++ b/drivers/usb/dwc3/core.h -@@ -1048,6 +1048,8 @@ struct dwc3_scratchpad_array { - * 3 - Reserved - * @dis_metastability_quirk: set to disable metastability quirk. - * @dis_split_quirk: set to disable split boundary. -+ * @host_vbus_glitches: set to avoid vbus glitch during -+ * xhci reset. - * @imod_interval: set the interrupt moderation interval in 250ns - * increments or 0 to disable. - */ -@@ -1243,6 +1245,8 @@ struct dwc3 { - - unsigned dis_split_quirk:1; - -+ unsigned host_vbus_glitches:1; -+ - u16 imod_interval; - }; - ---- a/drivers/usb/dwc3/host.c -+++ b/drivers/usb/dwc3/host.c -@@ -9,8 +9,49 @@ - - #include <linux/platform_device.h> - -+#include "../host/xhci.h" -+ - #include "core.h" - -+ -+#define XHCI_HCSPARAMS1 0x4 -+#define XHCI_PORTSC_BASE 0x400 -+ -+/* -+ * dwc3_power_off_all_roothub_ports - Power off all Root hub ports -+ * @dwc3: Pointer to our controller context structure -+ */ -+static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc) -+{ -+ int i, port_num; -+ u32 reg, op_regs_base, offset; -+ void __iomem *xhci_regs; -+ -+ /* xhci regs is not mapped yet, do it temperary here */ -+ if (dwc->xhci_resources[0].start) { -+ xhci_regs = ioremap(dwc->xhci_resources[0].start, -+ DWC3_XHCI_REGS_END); -+ if (IS_ERR(xhci_regs)) { -+ dev_err(dwc->dev, "Failed to ioremap xhci_regs\n"); -+ return; -+ } -+ -+ op_regs_base = HC_LENGTH(readl(xhci_regs)); -+ reg = readl(xhci_regs + XHCI_HCSPARAMS1); -+ port_num = HCS_MAX_PORTS(reg); -+ -+ for (i = 1; i <= port_num; i++) { -+ offset = op_regs_base + XHCI_PORTSC_BASE + 0x10*(i-1); -+ reg = readl(xhci_regs + offset); -+ reg &= ~PORT_POWER; -+ writel(reg, xhci_regs + offset); -+ } -+ -+ iounmap(xhci_regs); -+ } else -+ dev_err(dwc->dev, "xhci base reg invalid\n"); -+} -+ - static int dwc3_host_get_irq(struct dwc3 *dwc) - { - struct platform_device *dwc3_pdev = to_platform_device(dwc->dev); -@@ -50,6 +91,13 @@ int dwc3_host_init(struct dwc3 *dwc) - struct platform_device *dwc3_pdev = to_platform_device(dwc->dev); - int prop_idx = 0; - -+ /* -+ * We have to power off all Root hub ports immediately after DWC3 set -+ * to host mode to avoid VBUS glitch happen when xhci get reset later. -+ */ -+ if (dwc->host_vbus_glitches) -+ dwc3_power_off_all_roothub_ports(dwc); -+ - irq = dwc3_host_get_irq(dwc); - if (irq < 0) - return irq; |