[PATCH v2] usb: musb: Fix fifo reads for dm816x with musb_dsps

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Looks like dm81xx can only do 32-bit fifo reads like am35x. Let's set
up musb-dsps with a custom read_fifo function based on the compatible
flag.

Otherwise we can get the following errors when starting dhclient on a
asix USB Ethernet adapter:

asix 2-1:1.0 eth2: asix_rx_fixup() Bad Header Length 0xffff003c, offset 4

While at it, let's also remove pointless cast of the driver data.

Cc: Bin Liu <binmlist@xxxxxxxxx>
Cc: Brian Hutchinson <b.hutchman@xxxxxxxxx>
Cc: George Cherian <george.cherian@xxxxxx>
Cc: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
 drivers/usb/musb/musb_dsps.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index a900c98..2c0750e 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -655,6 +655,24 @@ static int dsps_musb_reset(struct musb *musb)
 	return !session_restart;
 }
 
+/* Similar to am35x, dm81xx support only 32-bit read operation */
+static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
+{
+	void __iomem *fifo = hw_ep->fifo;
+
+	if (len >= 4) {
+		readsl(fifo, dst, len >> 2);
+		dst += len & ~0x03;
+		len &= 0x03;
+	}
+
+	/* Read any remaining 1 to 3 bytes */
+	if (len > 0) {
+		u32 val = musb_readl(fifo, 0);
+		memcpy(dst, &val, len);
+	}
+}
+
 static struct musb_platform_ops dsps_ops = {
 	.quirks		= MUSB_INDEXED_EP,
 	.init		= dsps_musb_init,
@@ -802,6 +820,9 @@ static int dsps_probe(struct platform_device *pdev)
 	}
 	wrp = match->data;
 
+	if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816"))
+		dsps_ops.read_fifo = dsps_read_fifo32;
+
 	/* allocate glue */
 	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 	if (!glue)
@@ -878,7 +899,9 @@ static const struct dsps_musb_wrapper am33xx_driver_data = {
 
 static const struct of_device_id musb_dsps_of_match[] = {
 	{ .compatible = "ti,musb-am33xx",
-		.data = (void *) &am33xx_driver_data, },
+		.data = &am33xx_driver_data, },
+	{ .compatible = "ti,musb-dm816",
+		.data = &am33xx_driver_data, },
 	{  },
 };
 MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux