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 v3 01/13] phy: usb: EHCI DMA may lose a burst of DMA data for 7255xA0 family
Date: Tue, 10 Dec 2019 08:21:20 -0500 [thread overview]
Message-ID: <20191210132132.41509-2-alcooperx@gmail.com> (raw)
In-Reply-To: <20191210132132.41509-1-alcooperx@gmail.com>
When the EHCI controller received a 512 byte USB packet that
had to be broken into 2 256 byte bursts across the SCB bus AND
there was a following 512 byte USB packet, the second burst of
data from the first packet was sometimes being lost. If the
burst size was changed to 128 bytes via the EBR_SCB_SIZE field
in the USB_CTRL_EBRIDGE register we'd see the 4th 128 byte burst
of the first packet being lost. This problem became much worse
if other threads were running that accessed memory, like a memcpy
test. Setting the EBR_SCB_SIZE to 512, which prevents breaking
the EHCI USB packet (max size of 512 bytes) into bursts, fixed
the problem.
Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
drivers/phy/broadcom/phy-brcm-usb-init.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.c b/drivers/phy/broadcom/phy-brcm-usb-init.c
index 91b5b09589d6..bd473d12ab28 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init.c
+++ b/drivers/phy/broadcom/phy-brcm-usb-init.c
@@ -42,6 +42,7 @@
#define USB_CTRL_PLL_CTL_PLL_IDDQ_PWRDN_MASK 0x80000000 /* option */
#define USB_CTRL_EBRIDGE 0x0c
#define USB_CTRL_EBRIDGE_ESTOP_SCB_REQ_MASK 0x00020000 /* option */
+#define USB_CTRL_EBRIDGE_EBR_SCB_SIZE_MASK 0x00000f80 /* option */
#define USB_CTRL_OBRIDGE 0x10
#define USB_CTRL_OBRIDGE_LS_KEEP_ALIVE_MASK 0x08000000
#define USB_CTRL_MDIO 0x14
@@ -176,6 +177,7 @@ static const struct id_to_type id_to_type_table[] = {
{ 0x33900000, BRCM_FAMILY_3390A0 },
{ 0x72500010, BRCM_FAMILY_7250B0 },
{ 0x72600000, BRCM_FAMILY_7260A0 },
+ { 0x72550000, BRCM_FAMILY_7260A0 },
{ 0x72680000, BRCM_FAMILY_7271A0 },
{ 0x72710000, BRCM_FAMILY_7271A0 },
{ 0x73640000, BRCM_FAMILY_7364A0 },
@@ -948,6 +950,17 @@ void brcm_usb_init_eohci(struct brcm_usb_init_params *params)
if (params->selected_family == BRCM_FAMILY_7271A0)
/* Enable LS keep alive fix for certain keyboards */
USB_CTRL_SET(ctrl, OBRIDGE, LS_KEEP_ALIVE);
+
+ if (params->family_id == 0x72550000) {
+ /*
+ * Make the burst size 512 bytes to fix a hardware bug
+ * on the 7255a0. See HW7255-24.
+ */
+ reg = brcmusb_readl(USB_CTRL_REG(ctrl, EBRIDGE));
+ reg &= ~USB_CTRL_MASK(EBRIDGE, EBR_SCB_SIZE);
+ reg |= 0x800;
+ brcmusb_writel(reg, USB_CTRL_REG(ctrl, EBRIDGE));
+ }
}
void brcm_usb_init_xhci(struct brcm_usb_init_params *params)
--
2.17.1
next prev parent reply other threads:[~2019-12-10 13:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-10 13:21 [PATCH v3 00/13] phy: usb: Updates to Broadcom STB USB PHY driver Al Cooper
2019-12-10 13:21 ` Al Cooper [this message]
2019-12-10 13:21 ` [PATCH v3 02/13] phy: usb: Get all drivers that use USB clks using correct enable/disable Al Cooper
2019-12-10 13:21 ` [PATCH v3 03/13] phy: usb: Put USB phys into IDDQ on suspend to save power in S2 mode Al Cooper
2019-12-10 13:21 ` [PATCH v3 04/13] phy: usb: Add "wake on" functionality Al Cooper
2019-12-10 13:21 ` [PATCH v3 05/13] phy: usb: Restructure in preparation for adding 7216 USB support Al Cooper
2019-12-10 13:21 ` [PATCH v3 06/13] dt-bindings: Add Broadcom STB USB PHY binding document Al Cooper
2019-12-13 19:10 ` Rob Herring
2019-12-10 13:21 ` [PATCH v3 07/13] phy: usb: Add support for new Synopsis USB controller on the 7216 Al Cooper
2020-01-03 9:33 ` Kishon Vijay Abraham I
2020-01-03 13:06 ` Alan Cooper
2019-12-10 13:21 ` [PATCH v3 08/13] phy: usb: Add support for new Synopsis USB controller on the 7211b0 Al Cooper
2019-12-10 13:21 ` [PATCH v3 09/13] phy: usb: fix driver to defer on clk_get defer Al Cooper
2019-12-10 13:21 ` [PATCH v3 10/13] phy: usb: PHY's MDIO registers not accessible without device installed Al Cooper
2019-12-10 13:21 ` [PATCH v3 11/13] phy: usb: bdc: Fix occasional failure with BDC on 7211 Al Cooper
2019-12-10 13:21 ` [PATCH v3 12/13] phy: usb: USB driver is crashing during S3 resume on 7216 Al Cooper
2019-12-10 13:21 ` [PATCH v3 13/13] phy: usb: Add support for wake and USB low power mode for 7211 S2/S5 Al Cooper
2019-12-13 19:25 ` [PATCH v3 00/13] phy: usb: Updates to Broadcom STB USB PHY driver Florian Fainelli
2019-12-31 17:41 ` Florian Fainelli
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