mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 15:02:32 +00:00
62 lines
2.5 KiB
Diff
62 lines
2.5 KiB
Diff
From dc9aa43c43668481089c48135707ec3f8f5b2e19 Mon Sep 17 00:00:00 2001
|
|
From: Al Cooper <alcooperx@gmail.com>
|
|
Date: Fri, 3 Jan 2020 13:17:59 -0500
|
|
Subject: [PATCH] phy: usb: EHCI DMA may lose a burst of DMA data for 7255xA0
|
|
family
|
|
|
|
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>
|
|
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
|
|
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
|
|
---
|
|
drivers/phy/broadcom/phy-brcm-usb-init.c | 13 +++++++++++++
|
|
1 file changed, 13 insertions(+)
|
|
|
|
--- 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_typ
|
|
{ 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
|
|
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)
|