From: Neil Armstrong <narmstrong@baylibre.com>
To: balbi@kernel.org, khilman@baylibre.com
Cc: Neil Armstrong <narmstrong@baylibre.com>,
linux-usb@vger.kernel.org, linux-amlogic@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Dongjin Kim <tobetter@gmail.com>,
Jianxin Pan <jianxin.pan@amlogic.com>,
Thinh Nguyen <thinhn@synopsys.com>,
Jun Li <lijun.kernel@gmail.com>, Tim <elatllat@gmail.com>
Subject: [PATCH v2 2/3] usb: dwc3: gadget: Add support for disabling SS instances in park mode
Date: Thu, 9 Jan 2020 11:15:34 +0100 [thread overview]
Message-ID: <20200109101535.26812-3-narmstrong@baylibre.com> (raw)
In-Reply-To: <20200109101535.26812-1-narmstrong@baylibre.com>
In certain circumstances, the XHCI SuperSpeed instance in park mode
can fail to recover, thus on Amlogic G12A/G12B/SM1 SoCs when there is high
load on the single XHCI SuperSpeed instance, the controller can crash like:
xhci-hcd xhci-hcd.0.auto: xHCI host not responding to stop endpoint command.
xhci-hcd xhci-hcd.0.auto: Host halt failed, -110
xhci-hcd xhci-hcd.0.auto: xHCI host controller not responding, assume dead
xhci-hcd xhci-hcd.0.auto: xHCI host not responding to stop endpoint command.
hub 2-1.1:1.0: hub_ext_port_status failed (err = -22)
xhci-hcd xhci-hcd.0.auto: HC died; cleaning up
usb 2-1.1-port1: cannot reset (err = -22)
Setting the PARKMODE_DISABLE_SS bit in the DWC3_USB3_GUCTL1 mitigates
the issue. The bit is described as :
"When this bit is set to '1' all SS bus instances in park mode are disabled"
Synopsys explains in [1]:
The GUCTL1.PARKMODE_DISABLE_SS is only available in
dwc_usb3 controller running in host mode.
This should not be set for other IPs.
This can be disabled by default based on IP, but I recommend to have a
property to enable this feature for devices that need this.
[1] https://lore.kernel.org/linux-usb/45212db9-e366-2669-5c0a-3c5bd06287f6@synopsys.com
CC: Dongjin Kim <tobetter@gmail.com>
Cc: Jianxin Pan <jianxin.pan@amlogic.com>
Cc: Thinh Nguyen <thinhn@synopsys.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Reported-by: Tim <elatllat@gmail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
drivers/usb/dwc3/core.c | 5 +++++
drivers/usb/dwc3/core.h | 4 ++++
2 files changed, 9 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 2991e5056600..2cb441e2e51b 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1030,6 +1030,9 @@ static int dwc3_core_init(struct dwc3 *dwc)
if (dwc->dis_tx_ipgap_linecheck_quirk)
reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS;
+ if (dwc->parkmode_disable_ss_quirk)
+ reg |= DWC3_GUCTL1_PARKMODE_DISABLE_SS;
+
dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
}
@@ -1340,6 +1343,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
"snps,dis-del-phy-power-chg-quirk");
dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev,
"snps,dis-tx-ipgap-linecheck-quirk");
+ dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev,
+ "snps,parkmode-disable-ss-quirk");
dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,
"snps,tx_de_emphasis_quirk");
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 1c8b349379af..5fb557f24d38 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -249,6 +249,7 @@
#define DWC3_GUCTL_HSTINAUTORETRY BIT(14)
/* Global User Control 1 Register */
+#define DWC3_GUCTL1_PARKMODE_DISABLE_SS BIT(17)
#define DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS BIT(28)
#define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW BIT(24)
@@ -1022,6 +1023,8 @@ struct dwc3_scratchpad_array {
* change quirk.
* @dis_tx_ipgap_linecheck_quirk: set if we disable u2mac linestate
* check during HS transmit.
+ * @parkmode_disable_ss_quirk: set if we need to disable all SuperSpeed
+ * instances in park mode.
* @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk
* @tx_de_emphasis: Tx de-emphasis value
* 0 - -6dB de-emphasis
@@ -1213,6 +1216,7 @@ struct dwc3 {
unsigned dis_u2_freeclk_exists_quirk:1;
unsigned dis_del_phy_power_chg_quirk:1;
unsigned dis_tx_ipgap_linecheck_quirk:1;
+ unsigned parkmode_disable_ss_quirk:1;
unsigned tx_de_emphasis_quirk:1;
unsigned tx_de_emphasis:2;
--
2.22.0
next prev parent reply other threads:[~2020-01-09 10:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-09 10:15 [PATCH v2 0/3] arm64: g12-common: parkmode_disable_ss_quirk on DWC3 controller Neil Armstrong
2020-01-09 10:15 ` [PATCH v2 1/3] doc: dt: bindings: usb: dwc3: Update entries for disabling SS instances in park mode Neil Armstrong
2020-01-09 10:15 ` Neil Armstrong [this message]
2020-01-09 10:15 ` [PATCH v2 3/3] arm64: dts: g12-common: add parkmode_disable_ss_quirk on DWC3 controller Neil Armstrong
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