From eb72439dbb4acc936cbabf16cb0683a5a230e897 Mon Sep 17 00:00:00 2001 From: Martin Blumenstingl Date: Sat, 22 Jun 2019 10:37:45 +0200 Subject: [PATCH] lantiq: 4.19: increase usb reset timeouts With kernel 4.19 dwc2 would not want to initialize due to reset timeouts, while it worked fine with 4.14. Increase the reset timeouts to 1 second, as it was used by the old lantiq ifxhcd usb driver. Signed-off-by: Martin Blumenstingl Signed-off-by: Mathias Kresin --- ...onger-AHB-idle-timeout-in-dwc2_core_.patch | 35 +++++++++++++++++++ ...onger-core-rest-timeout-in-dwc2_core.patch | 29 +++++++++++++++ 2 files changed, 64 insertions(+) create mode 100644 target/linux/lantiq/patches-4.19/0002-usb-dwc2-use-a-longer-AHB-idle-timeout-in-dwc2_core_.patch create mode 100644 target/linux/lantiq/patches-4.19/0003-usb-dwc2-use-a-longer-core-rest-timeout-in-dwc2_core.patch diff --git a/target/linux/lantiq/patches-4.19/0002-usb-dwc2-use-a-longer-AHB-idle-timeout-in-dwc2_core_.patch b/target/linux/lantiq/patches-4.19/0002-usb-dwc2-use-a-longer-AHB-idle-timeout-in-dwc2_core_.patch new file mode 100644 index 0000000000..c004e44e4a --- /dev/null +++ b/target/linux/lantiq/patches-4.19/0002-usb-dwc2-use-a-longer-AHB-idle-timeout-in-dwc2_core_.patch @@ -0,0 +1,35 @@ +From bfe92b01cafebb10f0d7f38dceb37433687b7887 Mon Sep 17 00:00:00 2001 +From: Martin Blumenstingl +Date: Thu, 20 Jun 2019 19:50:22 +0200 +Subject: [PATCH] usb: dwc2: use a longer AHB idle timeout in dwc2_core_reset() + +Use a 10000us AHB idle timeout in dwc2_core_reset() and make it +consistent with the other "wait for AHB master IDLE state" ocurrences. + +This fixes a problem for me where dwc2 would not want to initialize when +updating to 4.19 on a MIPS Lantiq VRX200 SoC. dwc2 worked fine with +4.14. +Testing on my board shows that it takes 180us until AHB master IDLE +state is signalled. The very old vendor driver for this SoC (ifxhcd) +used a 1 second timeout. +Use the same timeout that is used everywhere when polling for +GRSTCTL_AHBIDLE instead of using a timeout that "works for one board" +(180us in my case) to have consistent behavior across the dwc2 driver. + +Cc: linux-stable # 4.19+ +Signed-off-by: Martin Blumenstingl +--- + drivers/usb/dwc2/core.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/drivers/usb/dwc2/core.c ++++ b/drivers/usb/dwc2/core.c +@@ -531,7 +531,7 @@ int dwc2_core_reset(struct dwc2_hsotg *h + } + + /* Wait for AHB master IDLE state */ +- if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 50)) { ++ if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000)) { + dev_warn(hsotg->dev, "%s: HANG! AHB Idle timeout GRSTCTL GRSTCTL_AHBIDLE\n", + __func__); + return -EBUSY; diff --git a/target/linux/lantiq/patches-4.19/0003-usb-dwc2-use-a-longer-core-rest-timeout-in-dwc2_core.patch b/target/linux/lantiq/patches-4.19/0003-usb-dwc2-use-a-longer-core-rest-timeout-in-dwc2_core.patch new file mode 100644 index 0000000000..dde7b3f23b --- /dev/null +++ b/target/linux/lantiq/patches-4.19/0003-usb-dwc2-use-a-longer-core-rest-timeout-in-dwc2_core.patch @@ -0,0 +1,29 @@ +From 09bbf8c732e7a6ce290fc7c2d5a3e79ec6c3e8d2 Mon Sep 17 00:00:00 2001 +From: Mathias Kresin +Date: Wed, 3 Jul 2019 17:03:02 +0200 +Subject: [PATCH] usb: dwc2: use a longer core rest timeout in + dwc2_core_reset() + +Testing on different generations of Lantiq MIPS SoC based boards, showed +that it takes up to 1500 us until the core reset bit is cleared. + +The driver from the vendor SDK (ifxhcd) uses a 1 second timeout. Use the +same timeout to fix wrong hang detections and make the driver work for +Lantiq MIPS SoCs. + +Signed-off-by: Mathias Kresin +--- + drivers/usb/dwc2/core.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/drivers/usb/dwc2/core.c ++++ b/drivers/usb/dwc2/core.c +@@ -524,7 +524,7 @@ int dwc2_core_reset(struct dwc2_hsotg *h + greset |= GRSTCTL_CSFTRST; + dwc2_writel(hsotg, greset, GRSTCTL); + +- if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 50)) { ++ if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 10000)) { + dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL GRSTCTL_CSFTRST\n", + __func__); + return -EBUSY; -- 2.25.1