Setting the PARKMODE_DISABLE_HS bit in the DWC3_USB3_GUCTL1.
When this bit is set to '1' all HS bus instances in park mode are disabled
For some USB wifi devices, if enable this feature it will reduce the
performance. Therefore, add an option for disabling HS park mode by
device-tree.
In Synopsys's dwc3 data book:
In a few high speed devices when an IN request is sent within 900ns of the
ACK of the previous packet, these devices send a NAK. When connected to
these devices, if required, the software can disable the park mode if you
see performance drop in your system. When park mode is disabled,
pipelining of multiple packet is disabled and instead one packet at a time
is requested by the scheduler. This allows up to 12 NAKs in a micro-frame
and improves performance of these slow devices.
Signed-off-by: Stanley Chang <stanley_chang@xxxxxxxxxxx>
---
v2 to v3 change:
1. Add the comment message.
2. cc the right maintainers.
---
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 476b63618511..8fbc92a5f2cb 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1233,6 +1233,9 @@ static int dwc3_core_init(struct dwc3 *dwc)
if (dwc->parkmode_disable_ss_quirk)
reg |= DWC3_GUCTL1_PARKMODE_DISABLE_SS;
+ if (dwc->parkmode_disable_hs_quirk)
+ reg |= DWC3_GUCTL1_PARKMODE_DISABLE_HS;
+
if (DWC3_VER_IS_WITHIN(DWC3, 290A, ANY) &&
(dwc->maximum_speed == USB_SPEED_HIGH ||
dwc->maximum_speed == USB_SPEED_FULL))
@@ -1555,6 +1558,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
"snps,resume-hs-terminations");
dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev,
"snps,parkmode-disable-ss-quirk");
+ dwc->parkmode_disable_hs_quirk = device_property_read_bool(dev,
+ "snps,parkmode-disable-hs-quirk");
dwc->gfladj_refclk_lpm_sel = device_property_read_bool(dev,
"snps,gfladj-refclk-lpm-sel-quirk");
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 4743e918dcaf..30907ffcb3ec 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -263,6 +263,7 @@
#define DWC3_GUCTL1_DEV_FORCE_20_CLK_FOR_30_CLK BIT(26)
#define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW BIT(24)
#define DWC3_GUCTL1_PARKMODE_DISABLE_SS BIT(17)
+#define DWC3_GUCTL1_PARKMODE_DISABLE_HS BIT(16)
#define DWC3_GUCTL1_RESUME_OPMODE_HS_HOST BIT(10)
/* Global Status Register */
@@ -1102,6 +1103,8 @@ struct dwc3_scratchpad_array {
* generation after resume from suspend.
* @parkmode_disable_ss_quirk: set if we need to disable all SuperSpeed
* instances in park mode.
+ * @parkmode_disable_hs_quirk: set if we need to disable all HishSpeed
+ * 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
@@ -1318,6 +1321,7 @@ struct dwc3 {
unsigned dis_tx_ipgap_linecheck_quirk:1;
unsigned resume_hs_terminations:1;
unsigned parkmode_disable_ss_quirk:1;
+ unsigned parkmode_disable_hs_quirk:1;
unsigned gfladj_refclk_lpm_sel:1;
unsigned tx_de_emphasis_quirk:1;
--
2.34.1
