linux-kernel - [PATCH 3.2 043/107] drivers: usb: fsl: Workaround for USB erratum-A005275

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Date:	Fri, 09 Oct 2015 01:12:28 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Nikhil Badola" <nikhil.badola@...escale.com>,
	"Ramneek Mehresh" <ramneek.mehresh@...escale.com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.2 043/107] drivers: usb: fsl: Workaround for USB
 erratum-A005275

3.2.72-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Nikhil Badola <nikhil.badola@...escale.com>

commit f8786a91548df6930643a052e40e5c0b7a8403a5 upstream.

Incoming packets in high speed are randomly corrupted by h/w
resulting in multiple errors. This workaround makes FS as
default mode in all affected socs by disabling HS chirp
signalling.This errata does not affect FS and LS mode.

Forces all HS devices to connect in FS mode for all socs
affected by this erratum:
P3041 and P2041 rev 1.0 and 1.1
P5020 and P5010 rev 1.0 and 2.0
P5040, P1010 and T4240 rev 1.0

Signed-off-by: Ramneek Mehresh <ramneek.mehresh@...escale.com>
Signed-off-by: Nikhil Badola <nikhil.badola@...escale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/host/ehci-fsl.c      |  4 ++++
 drivers/usb/host/ehci-hub.c      |  7 +++++++
 drivers/usb/host/ehci.h          | 12 ++++++++++++
 drivers/usb/host/fsl-mph-dr-of.c |  4 ++++
 include/linux/fsl_devices.h      |  1 +
 5 files changed, 28 insertions(+)

--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -272,6 +272,10 @@ static void ehci_fsl_usb_setup(struct eh
 	out_be32(non_ehci + FSL_SOC_USB_SNOOP2, 0x80000000 | SNOOP_SIZE_2GB);
 #endif
 
+	/* Deal with USB erratum A-005275 */
+	if (pdata->has_fsl_erratum_a005275 == 1)
+		ehci->has_fsl_hs_errata = 1;
+
 	if ((pdata->operating_mode == FSL_USB2_DR_HOST) ||
 			(pdata->operating_mode == FSL_USB2_DR_OTG))
 		ehci_fsl_setup_phy(ehci, pdata->phy_mode, 0);
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -1049,6 +1049,13 @@ static int ehci_hub_control (
 				 */
 				ehci->reset_done [wIndex] = jiffies
 						+ msecs_to_jiffies (50);
+
+				/*
+				 * Force full-speed connect for FSL high-speed
+				 * erratum; disable HS Chirp by setting PFSC bit
+				 */
+				if (ehci_has_fsl_hs_errata(ehci))
+					temp |= (1 << PORTSC_FSL_PFSC);
 			}
 			ehci_writel(ehci, temp, status_reg);
 			break;
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -136,6 +136,7 @@ struct ehci_hcd {			/* one per controlle
 	/* SILICON QUIRKS */
 	unsigned		no_selective_suspend:1;
 	unsigned		has_fsl_port_bug:1; /* FreeScale */
+	unsigned		has_fsl_hs_errata:1;	/* Freescale HS quirk */
 	unsigned		big_endian_mmio:1;
 	unsigned		big_endian_desc:1;
 	unsigned		big_endian_capbase:1;
@@ -612,6 +613,17 @@ ehci_port_speed(struct ehci_hcd *ehci, u
 #define	ehci_has_fsl_portno_bug(e)		(0)
 #endif
 
+#define PORTSC_FSL_PFSC	24	/* Port Force Full-Speed Connect */
+
+#if defined(CONFIG_PPC_85xx)
+/* Some Freescale processors have an erratum (USB A-005275) in which
+ * incoming packets get corrupted in HS mode
+ */
+#define ehci_has_fsl_hs_errata(e)	((e)->has_fsl_hs_errata)
+#else
+#define ehci_has_fsl_hs_errata(e)	(0)
+#endif
+
 /*
  * While most USB host controllers implement their registers in
  * little-endian format, a minority (celleb companion chip) implement
--- a/drivers/usb/host/fsl-mph-dr-of.c
+++ b/drivers/usb/host/fsl-mph-dr-of.c
@@ -166,6 +166,10 @@ static int __devinit fsl_usb2_mph_dr_of_
 
 	prop = of_get_property(np, "phy_type", NULL);
 	pdata->phy_mode = determine_usb_phy(prop);
+	if (of_get_property(np, "fsl,usb-erratum-a005275", NULL))
+		pdata->has_fsl_erratum_a005275 = 1;
+	else
+		pdata->has_fsl_erratum_a005275 = 0;
 
 	for (i = 0; i < ARRAY_SIZE(dev_data->drivers); i++) {
 		if (!dev_data->drivers[i])
--- a/include/linux/fsl_devices.h
+++ b/include/linux/fsl_devices.h
@@ -83,6 +83,7 @@ struct fsl_usb2_platform_data {
 
 	unsigned	suspended:1;
 	unsigned	already_suspended:1;
+	unsigned        has_fsl_erratum_a005275:1;
 
 	/* register save area for suspend/resume */
 	u32		pm_command;

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