[PATCH v4 20/20] usb: dwc3: make HIRD threshold configurable
From: Huang Rui
Date: Thu Oct 30 2014 - 06:11:56 EST
HIRD threshold should be configurable by different platforms.
>From DesignWare databook:
When HIRD_Threshold[4] is set to 1b1 and HIRD value is greater than or
equal to the value in HIRD_Threshold[3:0], dwc3 asserts output signals
utmi_l1_suspend_n to put PHY into Deep Low-Power mode in L1.
When HIRD_Threshold[4] is set to 1b0 or the HIRD value is less than
HIRD_Threshold[3:0], dwc3 asserts output signals utmi_sleep_n on L1.
Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
---
Documentation/devicetree/bindings/usb/dwc3.txt | 3 +++
drivers/usb/dwc3/core.c | 17 +++++++++++++++++
drivers/usb/dwc3/core.h | 6 ++++++
drivers/usb/dwc3/gadget.c | 6 +-----
drivers/usb/dwc3/platform_data.h | 3 +++
5 files changed, 30 insertions(+), 5 deletions(-)
diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index feaf2c8..5b99755 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -34,6 +34,9 @@ Optional properties:
LTSSM during USB3 Compliance mode.
- snps,dis_u3_susphy_quirk: when set core will disable USB3 suspend phy.
- snps,dis_u2_susphy_quirk: when set core will disable USB2 suspend phy.
+ - snps,is-utmi-l1-suspend: true when DWC3 asserts output signal
+ utmi_l1_suspend_n, false when asserts utmi_sleep_n
+ - snps,hird-threshold: HIRD threshold
This is usually a subnode to DWC3 glue to which it is connected.
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index a28ed1c..f4172ab 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -729,6 +729,7 @@ static int dwc3_probe(struct platform_device *pdev)
struct dwc3 *dwc;
u8 lpm_nyet_threshold;
u8 tx_de_emphasis;
+ u8 hird_threshold;
int ret;
@@ -790,12 +791,22 @@ static int dwc3_probe(struct platform_device *pdev)
/* default to -3.5dB de-emphasis */
tx_de_emphasis = 1;
+ /*
+ * defalut to assert utmi_sleep_n and use maximum allowed HIRD
+ * threshold value of 0b1100
+ */
+ hird_threshold = 12;
+
if (node) {
dwc->maximum_speed = of_usb_get_maximum_speed(node);
dwc->has_lpm_erratum = of_property_read_bool(node,
"snps,has-lpm-erratum");
of_property_read_u8(node, "snps,lpm-nyet-threshold",
&lpm_nyet_threshold);
+ dwc->is_utmi_l1_suspend = of_property_read_bool(node,
+ "snps,is-utmi-l1-suspend");
+ of_property_read_u8(node, "snps,hird-threshold",
+ &hird_threshold);
dwc->needs_fifo_resize = of_property_read_bool(node,
"tx-fifo-resize");
@@ -831,6 +842,9 @@ static int dwc3_probe(struct platform_device *pdev)
dwc->has_lpm_erratum = pdata->has_lpm_erratum;
if (pdata->lpm_nyet_threshold)
lpm_nyet_threshold = pdata->lpm_nyet_threshold;
+ dwc->is_utmi_l1_suspend = pdata->is_utmi_l1_suspend;
+ if (pdata->hird_threshold)
+ hird_threshold = pdata->hird_threshold;
dwc->needs_fifo_resize = pdata->tx_fifo_resize;
dwc->dr_mode = pdata->dr_mode;
@@ -858,6 +872,9 @@ static int dwc3_probe(struct platform_device *pdev)
dwc->lpm_nyet_threshold = lpm_nyet_threshold;
dwc->tx_de_emphasis = tx_de_emphasis;
+ dwc->hird_threshold = hird_threshold
+ | (dwc->is_utmi_l1_suspend << 4);
+
ret = dwc3_core_get_phy(dwc);
if (ret)
return ret;
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 8b6c308..2c90139 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -675,12 +675,16 @@ struct dwc3_scratchpad_array {
* @test_mode: true when we're entering a USB test mode
* @test_mode_nr: test feature selector
* @lpm_nyet_threshold: LPM NYET response threshold
+ * @hird_threshold: HIRD threshold
* @delayed_status: true when gadget driver asks for delayed status
* @ep0_bounced: true when we used bounce buffer
* @ep0_expect_in: true when we expect a DATA IN transfer
* @has_hibernation: true when dwc3 was configured with Hibernation
* @has_lpm_erratum: true when core was configured with LPM Erratum. Note that
* there's now way for software to detect this in runtime.
+ * @is_utmi_l1_suspend: the core asserts output signal
+ * 0 - utmi_sleep_n
+ * 1 - utmi_l1_suspend_n
* @is_selfpowered: true when we are selfpowered
* @is_fpga: true when we are using the FPGA board
* @needs_fifo_resize: not all users might want fifo resizing, flag it
@@ -797,12 +801,14 @@ struct dwc3 {
u8 test_mode;
u8 test_mode_nr;
u8 lpm_nyet_threshold;
+ u8 hird_threshold;
unsigned delayed_status:1;
unsigned ep0_bounced:1;
unsigned ep0_expect_in:1;
unsigned has_hibernation:1;
unsigned has_lpm_erratum:1;
+ unsigned is_utmi_l1_suspend:1;
unsigned is_selfpowered:1;
unsigned is_fpga:1;
unsigned needs_fifo_resize:1;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2c0d19a4..303bb67 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2291,11 +2291,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
- /*
- * TODO: This should be configurable. For now using
- * maximum allowed HIRD threshold value of 0b1100
- */
- reg |= DWC3_DCTL_HIRD_THRES(12);
+ reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
/*
* When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index 245300b..a3a3b6d 100644
--- a/drivers/usb/dwc3/platform_data.h
+++ b/drivers/usb/dwc3/platform_data.h
@@ -25,6 +25,9 @@ struct dwc3_platform_data {
enum usb_dr_mode dr_mode;
bool tx_fifo_resize;
+ unsigned is_utmi_l1_suspend:1;
+ u8 hird_threshold;
+
u8 lpm_nyet_threshold;
unsigned disable_scramble_quirk:1;
--
1.9.1
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