diff options
| author | Jun Li <r65092@freescale.com> | 2010-05-19 13:20:59 +0800 |
|---|---|---|
| committer | Jun Li <r65092@freescale.com> | 2010-05-19 14:34:58 +0800 |
| commit | b3f983d3f07b862408916da507c1ff1b92cd283e (patch) | |
| tree | 5a71e4944badee6bccde863128413497b5888488 | |
| parent | 01d3be4c8cea7644a69e739d2066974e49e2407c (diff) | |
ENGR00123491 i.mx53 arc usb host increase tx fifo threshold.
There are bad turnaround erros when copying data from SD to Udisk
via Host port in i.mx53. Tunning TX fifo fill threshold from 2 to 8.
FIFO Burst Threshold:(Read/Write) [Default = 2] This register controls
the number of data bursts that are posted to the TX latency FIFO in host
mode before the packet begins on to the bus. The minimum value is 2 and
this value should be a low as possible to maximize USB performance. A
higher value can be used in systems with unpredictable latency and/or
insufficient bandwidth where the FIFO may underrun because the data
transferred from the latency FIFO to USB occurs before it can be
replenished from system memory. This value is ignored if the Stream
Disable bit in USBMODE register is set.
Signed-off-by: Li Jun <r65092@freescale.com>
| -rw-r--r-- | arch/arm/plat-mxc/include/mach/fsl_usb.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/arm/plat-mxc/include/mach/fsl_usb.h b/arch/arm/plat-mxc/include/mach/fsl_usb.h index d1235fc337ff..71263360dc69 100644 --- a/arch/arm/plat-mxc/include/mach/fsl_usb.h +++ b/arch/arm/plat-mxc/include/mach/fsl_usb.h @@ -1,5 +1,5 @@ /* - * Copyright 2005-2009 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2005-2010 Freescale Semiconductor, Inc. All Rights Reserved. */ /* @@ -88,4 +88,13 @@ static inline void fsl_platform_set_ahb_burst(struct usb_hcd *hcd) writel((temp & (~(0x3f << 16))) | (0x20 << 16), hcd->regs + FSL_SOC_USB_TXFILLTUNING); } + + /* Increase TX fifo threshold for USB+SD in Hostx */ + if (cpu_is_mx53() && (strcmp("DR", pdata->name))) { + temp = readl(hcd->regs + FSL_SOC_USB_TXFILLTUNING); + /* Change TX FIFO threshold to be 0x08 */ + writel((temp & (~(0x3f << 16))) | (0x08 << 16), + hcd->regs + FSL_SOC_USB_TXFILLTUNING); + } + } |