@@ -119,6 +119,15 @@ static int usb_hcd_fsl_probe(const struct hc_driver *driver,
if (pdata->have_sysif_regs && pdata->controller_ver < FSL_USB_VER_1_6)
setbits32(hcd->regs + FSL_SOC_USB_CTRL, 0x4);
+ /*
+ * Enable UTMI phy and program PTS field in UTMI mode before asserting
+ * controller reset for USB Controller version 2.5
+ */
+ if (pdata->has_fsl_erratum_a007792) {
+ writel_be(CTRL_UTMI_PHY_EN, hcd->regs + FSL_SOC_USB_CTRL);
+ writel(PORT_PTS_UTMI, hcd->regs + FSL_SOC_USB_PORTSC1);
+ }
+
/* Don't need to set host mode here. It will be done by tdi_reset() */
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
@@ -206,6 +206,12 @@ static int fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev)
pdata->phy_mode = determine_usb_phy(prop);
pdata->controller_ver = usb_get_ver_info(np);
+ /* Activate Erratum by reading property in device tree */
+ if (of_get_property(np, "fsl,usb-erratum-a007792", NULL))
+ pdata->has_fsl_erratum_a007792 = 1;
+ else
+ pdata->has_fsl_erratum_a007792 = 0;
+
if (pdata->have_sysif_regs) {
if (pdata->controller_ver < 0) {
dev_warn(&ofdev->dev, "Could not get controller version\n");
@@ -92,6 +92,7 @@ struct fsl_usb2_platform_data {
unsigned suspended:1;
unsigned already_suspended:1;
+ unsigned has_fsl_erratum_a007792:1;
/* register save area for suspend/resume */
u32 pm_command;
This is a note to let you know that I have just added a patch titled drivers: usb :fsl: Implement Workaround for USB Erratum A007792 to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue This patch is scheduled to be released in version 3.19.8-ckt8. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.19.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From 61d360efe0de84c9f8916002ac2d07ca8794cd69 Mon Sep 17 00:00:00 2001 From: Nikhil Badola <nikhil.badola@freescale.com> Date: Mon, 15 Jun 2015 15:47:29 +0530 Subject: drivers: usb :fsl: Implement Workaround for USB Erratum A007792 commit 523f1dec58408b36e7683a3d61a0286eed1fc1c8 upstream. USB controller version-2.5 requires to enable internal UTMI phy and program PTS field in PORTSC register before asserting controller reset. This is must for successful resetting of the controller and subsequent enumeration of usb devices Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com> Signed-off-by: Suresh Gupta <suresh.gupta@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/usb/host/ehci-fsl.c | 9 +++++++++ drivers/usb/host/fsl-mph-dr-of.c | 6 ++++++ include/linux/fsl_devices.h | 1 + 3 files changed, 16 insertions(+) -- 1.9.1