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Date: Thu, 23 Jul 2015 15:41:35 +0530
From: Nikhil Badola <nikhil.badola@...escale.com>
To: <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
<linux-omap@...r.kernel.org>
CC: <balbi@...com>, <gregkh@...uxfoundation.org>,
Nikhil Badola <nikhil.badola@...escale.com>
Subject: [PATCH 2/3] drivers: usb: dwc3: Add adjust_frame_length_quirk
Add adjust_frame_length_quirk for writing to fladj register
which adjusts (micro)frame length to value provided by
"snps,configure-fladj" property thus avoiding USB 2.0 devices
to time-out over a longer run
Signed-off-by: Nikhil Badola <nikhil.badola@...escale.com>
---
drivers/usb/dwc3/core.c | 12 ++++++++++++
drivers/usb/dwc3/core.h | 7 +++++++
2 files changed, 19 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 5c110d8..72ba025 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -779,6 +779,7 @@ static int dwc3_probe(struct platform_device *pdev)
u8 lpm_nyet_threshold;
u8 tx_de_emphasis;
u8 hird_threshold;
+ u32 fladj_value;
int ret;
@@ -886,6 +887,12 @@ static int dwc3_probe(struct platform_device *pdev)
&tx_de_emphasis);
of_property_read_string(node, "snps,hsphy_interface",
&dwc->hsphy_interface);
+ ret = of_property_read_u32(node, "snps,configure-fladj",
+ &fladj_value);
+ if (!ret)
+ dwc->adjust_frame_length_quirk = 1;
+ else
+ dwc->adjust_frame_length_quirk = 0;
} else if (pdata) {
dwc->maximum_speed = pdata->maximum_speed;
dwc->has_lpm_erratum = pdata->has_lpm_erratum;
@@ -957,6 +964,11 @@ static int dwc3_probe(struct platform_device *pdev)
goto err1;
}
+ /* Adjust Frame Length */
+ if (dwc->adjust_frame_length_quirk)
+ dwc3_writel(dwc->regs, DWC3_GFLADJ, GFLADJ_30MHZ_REG_SEL |
+ GFLADJ_30MHZ(fladj_value));
+
if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
dwc->dr_mode = USB_DR_MODE_HOST;
else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 0447788..b7a5119 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -124,6 +124,7 @@
#define DWC3_GEVNTCOUNT(n) (0xc40c + (n * 0x10))
#define DWC3_GHWPARAMS8 0xc600
+#define DWC3_GFLADJ 0xc630
/* Device Registers */
#define DWC3_DCFG 0xc700
@@ -234,6 +235,10 @@
/* Global HWPARAMS6 Register */
#define DWC3_GHWPARAMS6_EN_FPGA (1 << 7)
+/* Global Frame Length Adjustment Register */
+#define GFLADJ_30MHZ_REG_SEL (1 << 7)
+#define GFLADJ_30MHZ(n) ((n) & 0x3f)
+
/* Device Configuration Register */
#define DWC3_DCFG_DEVADDR(addr) ((addr) << 3)
#define DWC3_DCFG_DEVADDR_MASK DWC3_DCFG_DEVADDR(0x7f)
@@ -712,6 +717,7 @@ struct dwc3_scratchpad_array {
* @rx_detect_poll_quirk: set if we enable rx_detect to polling lfps quirk
* @dis_u3_susphy_quirk: set if we disable usb3 suspend phy
* @dis_u2_susphy_quirk: set if we disable usb2 suspend phy
+ * @adjust_frame_length_quirk: enables post-silicon frame length adjustment
* @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk
* @tx_de_emphasis: Tx de-emphasis value
* 0 - -6dB de-emphasis
@@ -841,6 +847,7 @@ struct dwc3 {
unsigned rx_detect_poll_quirk:1;
unsigned dis_u3_susphy_quirk:1;
unsigned dis_u2_susphy_quirk:1;
+ unsigned adjust_frame_length_quirk:1;
unsigned tx_de_emphasis_quirk:1;
unsigned tx_de_emphasis:2;
--
2.1.0
--
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