summaryrefslogtreecommitdiff
path: root/drivers/usb
diff options
context:
space:
mode:
authorNikhil Badola <nikhil.badola@freescale.com>2014-04-07 08:46:14 +0530
committerYork Sun <yorksun@freescale.com>2014-04-22 17:58:49 -0700
commit896720ceb2cededcd1f25fa5f5ff23822bea466d (patch)
tree9394f32f5db254e5c438816c92f8bfc14bb35706 /drivers/usb
parent55153d6c30d8ce11c8a7acf226375e61546b8401 (diff)
downloadu-boot-imx-896720ceb2cededcd1f25fa5f5ff23822bea466d.zip
u-boot-imx-896720ceb2cededcd1f25fa5f5ff23822bea466d.tar.gz
u-boot-imx-896720ceb2cededcd1f25fa5f5ff23822bea466d.tar.bz2
fsl/usb: Increase TXFIFOTHRESH value for usb write in T4 Rev 2.0
Increase TXFIFOTHRES field value in TXFILLTUNING register of usb for T4 Rev 2.0. This decreases data burst rate with which data packets are posted from the TX latency FIFO to compensate for latencies in DDR pipeline during DMA. This avoids Tx buffer underruns and leads to successful usb writes Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com> Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/ehci-fsl.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 1d012db..6cb4d98 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -18,6 +18,8 @@
#include "ehci.h"
+static void set_txfifothresh(struct usb_ehci *, u32);
+
/* Check USB PHY clock valid */
static int usb_phy_clk_valid(struct usb_ehci *ehci)
{
@@ -123,6 +125,10 @@ int ehci_hcd_init(int index, enum usb_init_type init,
in_le32(&ehci->usbmode);
+ if (SVR_SOC_VER(get_svr()) == SVR_T4240 &&
+ IS_SVR_REV(get_svr(), 2, 0))
+ set_txfifothresh(ehci, TXFIFOTHRESH);
+
return 0;
}
@@ -134,3 +140,17 @@ int ehci_hcd_stop(int index)
{
return 0;
}
+
+/*
+ * Setting the value of TXFIFO_THRESH field in TXFILLTUNING register
+ * to counter DDR latencies in writing data into Tx buffer.
+ * This prevents Tx buffer from getting underrun
+ */
+static void set_txfifothresh(struct usb_ehci *ehci, u32 txfifo_thresh)
+{
+ u32 cmd;
+ cmd = ehci_readl(&ehci->txfilltuning);
+ cmd &= ~TXFIFO_THRESH_MASK;
+ cmd |= TXFIFO_THRESH(txfifo_thresh);
+ ehci_writel(&ehci->txfilltuning, cmd);
+}