From: Al Cooper <alcooperx@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Al Cooper <alcooperx@gmail.com>,
bcm-kernel-feedback-list@broadcom.com,
devicetree@vger.kernel.org,
Florian Fainelli <f.fainelli@gmail.com>,
Kishon Vijay Abraham I <kishon@ti.com>,
linux-arm-kernel@lists.infradead.org,
Mark Rutland <mark.rutland@arm.com>,
Rob Herring <robh+dt@kernel.org>,
Srinath Mannam <srinath.mannam@broadcom.com>
Subject: [PATCH v2 11/13] phy: usb: bdc: Fix occasional failure with BDC on 7211
Date: Fri, 15 Nov 2019 13:42:21 -0500 [thread overview]
Message-ID: <20191115184223.41504-12-alcooperx@gmail.com> (raw)
In-Reply-To: <20191115184223.41504-1-alcooperx@gmail.com>
The BDC "Read Transaction Size" needs to be changed from 1024
bytes to 256 bytes to prevent occasional transaction failures.
Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
.../phy/broadcom/phy-brcm-usb-init-synopsis.c | 18 +++++++++++++++
drivers/phy/broadcom/phy-brcm-usb-init.h | 1 +
drivers/phy/broadcom/phy-brcm-usb.c | 23 +++++++++++++++----
3 files changed, 38 insertions(+), 4 deletions(-)
diff --git a/drivers/phy/broadcom/phy-brcm-usb-init-synopsis.c b/drivers/phy/broadcom/phy-brcm-usb-init-synopsis.c
index fe3f653c64a7..c6504649d307 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init-synopsis.c
+++ b/drivers/phy/broadcom/phy-brcm-usb-init-synopsis.c
@@ -70,6 +70,11 @@
#define USB_GMDIOCSR 0
#define USB_GMDIOGEN 4
+/* Register definitions for the BDC EC block in 7211b0 */
+#define BDC_EC_AXIRDA 0x0c
+#define BDC_EC_AXIRDA_RTS_MASK 0xf0000000
+#define BDC_EC_AXIRDA_RTS_SHIFT 28
+
static void usb_mdio_write_7211b0(struct brcm_usb_init_params *params,
uint8_t addr, uint16_t data)
@@ -198,6 +203,7 @@ static void usb_init_common_7211b0(struct brcm_usb_init_params *params)
{
void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
void __iomem *usb_phy = params->regs[BRCM_REGS_USB_PHY];
+ void __iomem *bdc_ec = params->regs[BRCM_REGS_BDC_EC];
int timeout_ms = PHY_LOCK_TIMEOUT_MS;
u32 reg;
@@ -230,6 +236,18 @@ static void usb_init_common_7211b0(struct brcm_usb_init_params *params)
usb_init_common(params);
+ /*
+ * The BDC controller will get occasional failures with
+ * the default "Read Transaction Size" of 6 (1024 bytes).
+ * Set it to 4 (256 bytes).
+ */
+ if ((params->mode != USB_CTLR_MODE_HOST) && bdc_ec) {
+ reg = brcm_usb_readl(bdc_ec + BDC_EC_AXIRDA);
+ reg &= ~BDC_EC_AXIRDA_RTS_MASK;
+ reg |= (0x4 << BDC_EC_AXIRDA_RTS_SHIFT);
+ brcm_usb_writel(reg, bdc_ec + BDC_EC_AXIRDA);
+ }
+
/*
* Disable FSM, otherwise the PHY will auto suspend when no
* device is connected and will be reset on resume.
diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.h b/drivers/phy/broadcom/phy-brcm-usb-init.h
index 66363b04d778..570bd9d8c9ec 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init.h
+++ b/drivers/phy/broadcom/phy-brcm-usb-init.h
@@ -19,6 +19,7 @@ enum brcmusb_reg_sel {
BRCM_REGS_XHCI_GBL,
BRCM_REGS_USB_PHY,
BRCM_REGS_USB_MDIO,
+ BRCM_REGS_BDC_EC,
BRCM_REGS_MAX
};
diff --git a/drivers/phy/broadcom/phy-brcm-usb.c b/drivers/phy/broadcom/phy-brcm-usb.c
index c82d7ec15334..cc5763ace3ad 100644
--- a/drivers/phy/broadcom/phy-brcm-usb.c
+++ b/drivers/phy/broadcom/phy-brcm-usb.c
@@ -36,6 +36,7 @@ struct value_to_name_map {
struct match_chip_info {
void *init_func;
u8 required_regs[BRCM_REGS_MAX + 1];
+ u8 optional_reg;
};
static struct value_to_name_map brcm_dr_mode_to_name[] = {
@@ -71,7 +72,7 @@ struct brcm_usb_phy_data {
};
static s8 *node_reg_names[BRCM_REGS_MAX] = {
- "crtl", "xhci_ec", "xhci_gbl", "usb_phy", "usb_mdio"
+ "crtl", "xhci_ec", "xhci_gbl", "usb_phy", "usb_mdio", "bdc_ec"
};
static irqreturn_t brcm_usb_phy_wake_isr(int irq, void *dev_id)
@@ -271,6 +272,7 @@ static struct match_chip_info chip_info_7211b0 = {
BRCM_REGS_USB_MDIO,
-1,
},
+ .optional_reg = BRCM_REGS_BDC_EC,
};
static struct match_chip_info chip_info_7445 = {
@@ -300,7 +302,8 @@ static const struct of_device_id brcm_usb_dt_ids[] = {
static int brcm_usb_get_regs(struct platform_device *pdev,
enum brcmusb_reg_sel regs,
- struct brcm_usb_init_params *ini)
+ struct brcm_usb_init_params *ini,
+ bool optional)
{
struct resource *res;
@@ -317,7 +320,13 @@ static int brcm_usb_get_regs(struct platform_device *pdev,
return 0;
}
if (res == NULL) {
- dev_err(&pdev->dev, "can't get %s base address\n",
+ if (optional) {
+ dev_dbg(&pdev->dev,
+ "Optional reg %s not found\n",
+ node_reg_names[regs]);
+ return 0;
+ }
+ dev_err(&pdev->dev, "can't get %s base addr\n",
node_reg_names[regs]);
return 1;
}
@@ -460,7 +469,13 @@ static int brcm_usb_phy_probe(struct platform_device *pdev)
break;
err = brcm_usb_get_regs(pdev, info->required_regs[x],
- &priv->ini);
+ &priv->ini, false);
+ if (err)
+ return -EINVAL;
+ }
+ if (info->optional_reg) {
+ err = brcm_usb_get_regs(pdev, info->optional_reg,
+ &priv->ini, true);
if (err)
return -EINVAL;
}
--
2.17.1
next prev parent reply other threads:[~2019-11-15 18:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-15 18:42 [PATCH v2 00/13] phy: usb: Updates to Broadcom STB USB PHY driver Al Cooper
2019-11-15 18:42 ` [PATCH v2 01/13] phy: usb: EHCI DMA may lose a burst of DMA data for 7255xA0 family Al Cooper
2019-11-15 18:42 ` [PATCH v2 02/13] phy: usb: Get all drivers that use USB clks using correct enable/disable Al Cooper
2019-11-15 18:42 ` [PATCH v2 03/13] phy: usb: Put USB phys into IDDQ on suspend to save power in S2 mode Al Cooper
2019-11-15 18:42 ` [PATCH v2 04/13] phy: usb: Add "wake on" functionality Al Cooper
2019-11-15 18:42 ` [PATCH v2 05/13] phy: usb: Restructure in preparation for adding 7216 USB support Al Cooper
2019-11-15 18:42 ` [PATCH v2 06/13] dt-bindings: Add Broadcom STB USB PHY binding document Al Cooper
2019-12-03 19:34 ` Rob Herring
2019-11-15 18:42 ` [PATCH v2 07/13] phy: usb: Add support for new Synopsis USB controller on the 7216 Al Cooper
2019-11-15 18:42 ` [PATCH v2 08/13] phy: usb: Add support for new Synopsis USB controller on the 7211b0 Al Cooper
2019-11-15 18:42 ` [PATCH v2 09/13] phy: usb: fix driver to defer on clk_get defer Al Cooper
2019-11-15 18:42 ` [PATCH v2 10/13] phy: usb: PHY's MDIO registers not accessible without device installed Al Cooper
2019-11-15 18:42 ` Al Cooper [this message]
2019-11-15 18:42 ` [PATCH v2 12/13] phy: usb: USB driver is crashing during S3 resume on 7216 Al Cooper
2019-11-15 18:42 ` [PATCH v2 13/13] phy: usb: Add support for wake and USB low power mode for 7211 S2/S5 Al Cooper
2019-12-05 23:46 ` [PATCH v2 00/13] phy: usb: Updates to Broadcom STB USB PHY driver Florian Fainelli
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