From 32a4a135847b1e600c64756b7c7c7a91eb2f0aa9 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <balbi@ti.com>
Date: Tue, 25 Feb 2014 14:00:13 -0600
Subject: [PATCH] usb: dwc3: workaround: clock gating issues
Revisions between 2.10a and 2.50a (included) have
a known issue which may cause xHCI compliance tests
to fail and/or quality issues with Isochronous
transactions.
Note that this issue only impacts certain configurations
of those revisions, namely the ones which have clock
gating enabled.
The suggested workaround is to disable clock gating in
known broken revisions, make sure HW LPM is disabled
and set GCTL.SOFITPSYNC to 1.
Signed-off-by: Felipe Balbi <balbi@ti.com>
---
drivers/usb/dwc3/core.c | 36 +++++++++++++++++++++++++++---------
1 file changed, 27 insertions(+), 9 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index a49217ae35333..785feeeac3c18 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -314,7 +314,25 @@ static int dwc3_core_init(struct dwc3 *dwc)
switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
- reg &= ~DWC3_GCTL_DSBLCLKGTNG;
+ /**
+ * WORKAROUND: DWC3 revisions between 2.10a and 2.50a have an
+ * issue which would cause xHCI compliance tests to fail.
+ *
+ * Because of that we cannot enable clock gating on such
+ * configurations.
+ *
+ * Refers to:
+ *
+ * STAR#9000588375: Clock Gating, SOF Issues when ref_clk-Based
+ * SOF/ITP Mode Used
+ */
+ if ((dwc->dr_mode == USB_DR_MODE_HOST ||
+ dwc->dr_mode == USB_DR_MODE_OTG) &&
+ (dwc->revision >= DWC3_REVISION_210A &&
+ dwc->revision <= DWC3_REVISION_250A))
+ reg |= DWC3_GCTL_DSBLCLKGTNG | DWC3_GCTL_SOFITPSYNC;
+ else
+ reg &= ~DWC3_GCTL_DSBLCLKGTNG;
break;
default:
dev_dbg(dwc->dev, "No power optimization available\n");
@@ -479,6 +497,14 @@ static int dwc3_probe(struct platform_device *pdev)
goto err0;
}
+ if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
+ dwc->dr_mode = USB_DR_MODE_HOST;
+ else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
+ dwc->dr_mode = USB_DR_MODE_PERIPHERAL;
+
+ if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
+ dwc->dr_mode = USB_DR_MODE_OTG;
+
ret = dwc3_core_init(dwc);
if (ret) {
dev_err(dev, "failed to initialize core\n");
@@ -494,14 +520,6 @@ static int dwc3_probe(struct platform_device *pdev)
goto err1;
}
- if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
- dwc->dr_mode = USB_DR_MODE_HOST;
- else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
- dwc->dr_mode = USB_DR_MODE_PERIPHERAL;
-
- if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
- dwc->dr_mode = USB_DR_MODE_OTG;
-
switch (dwc->dr_mode) {
case USB_DR_MODE_PERIPHERAL:
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
--
2.30.2