1 files changed, 43 insertions, 0 deletions

diff --git a/recipes-kernel/linux/linux-ti33x-psp-3.2/psp/0012-usb-musb-cppi41-use-dsb-to-make-sure-PDs-are-updated.patch b/recipes-kernel/linux/linux-ti33x-psp-3.2/psp/0012-usb-musb-cppi41-use-dsb-to-make-sure-PDs-are-updated.patch
new file mode 100644
index 00000000..0edb2557
--- /dev/null
+++ b/recipes-kernel/linux/linux-ti33x-psp-3.2/psp/0012-usb-musb-cppi41-use-dsb-to-make-sure-PDs-are-updated.patch
@@ -0,0 +1,43 @@
+From 946a82d6042097a0b3c5e072df75da9ffcbbc44c Mon Sep 17 00:00:00 2001
+From: Ajay Kumar Gupta <ajay.gupta@ti.com>
+Date: Thu, 24 May 2012 15:45:45 +0530
+Subject: [PATCH 12/18] usb: musb: cppi41: use dsb() to make sure PDs are
+ updated to memory
+
+Before pushing the tx/rx cppi packet descriptors to respective input queues
+of TX/RX DMA channels, use memory barrier dsb() to make sure the descriptors
+contents are written to memory
+
+Signed-off-by: Ravi B <ravibabu@ti.com>
+---
+ drivers/usb/musb/cppi41_dma.c |    7 +++++++
+ 1 files changed, 7 insertions(+), 0 deletions(-)
+
+diff --git a/drivers/usb/musb/cppi41_dma.c b/drivers/usb/musb/cppi41_dma.c
+index 3665d0f..bf74cf3 100644
+--- a/drivers/usb/musb/cppi41_dma.c
++++ b/drivers/usb/musb/cppi41_dma.c
+@@ -653,6 +653,9 @@ static unsigned cppi41_next_tx_segment(struct cppi41_channel *tx_ch)
+                dev_dbg(musb->controller, "TX PD %p: buf %08x, len %08x, pkt info %08x\n", curr_pd,
+                    hw_desc->buf_ptr, hw_desc->buf_len, hw_desc->pkt_info);
+ 
++               /* make sure descriptor details are updated to memory*/
++               dsb();
++
+                /* enable tx fifo empty interrupt */
+                if (tx_ch->txfifo_intr_enable) {
+                        dev_dbg(musb->controller, "txs(%p %d) enable txFintr\n",
+@@ -869,6 +872,10 @@ static unsigned cppi41_next_rx_segment(struct cppi41_channel *rx_ch)
+ 
+                if (en_bd_intr)
+                        hw_desc->orig_buf_len |= CPPI41_PKT_INTR_FLAG;
++
++               /* make sure descriptor details are updated to memory*/
++               dsb();
++
+                /*
+                 * Push the free Rx packet descriptor
+                 * to the free descriptor/buffer queue.
+-- 
+1.7.7.6
+