[U-Boot] [PATCH v3] usb: omap: ulpi: fix ulpi transceiver access

[Michael Trimarchi <michael@amarulasolutions.com>]

This patch fix the omap access to the transceiver
configuration registers using the ulpi bus. As reported by
the documentation the bit31 is used only to check if the
transaction is done or still running and the reading and
writing operation have different offset and have different
values. What we need to do at the end of a transaction is
leave the bus in done state. Anyway an error using the ulpi
omap register is not recoverable so any error give out the
usage of this interface.

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Igor Grinberg <grinberg@compulab.co.il>
---
- changes for V3
  Fix patch subject
- changes for V2
  Fix commit message
---
 drivers/usb/ulpi/omap-ulpi-viewport.c |   40 +++++++--------------------------
 1 file changed, 8 insertions(+), 32 deletions(-)

diff --git a/drivers/usb/ulpi/omap-ulpi-viewport.c b/drivers/usb/ulpi/omap-ulpi-viewport.c
index 3c1ea1a..2a42033 100644
--- a/drivers/usb/ulpi/omap-ulpi-viewport.c
+++ b/drivers/usb/ulpi/omap-ulpi-viewport.c
@@ -22,18 +22,19 @@
 #include <asm/io.h>
 #include <usb/ulpi.h>
 
-#define OMAP_ULPI_WR_OPSEL	(3 << 21)
-#define OMAP_ULPI_ACCESS	(1 << 31)
+#define OMAP_ULPI_WR_OPSEL	(2 << 22)
+#define OMAP_ULPI_RD_OPSEL	(3 << 22)
+#define OMAP_ULPI_START		(1 << 31)
 
 /*
- * Wait for the ULPI Access to complete
+ * Wait for having ulpi in done state
  */
 static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
 {
 	int timeout = CONFIG_USB_ULPI_TIMEOUT;
 
 	while (--timeout) {
-		if ((readl(ulpi_vp->viewport_addr) & mask))
+		if (!(readl(ulpi_vp->viewport_addr) & mask))
 			return 0;
 
 		udelay(1);
@@ -43,40 +44,15 @@ static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
 }
 
 /*
- * Wake the ULPI PHY up for communication
- *
- * returns 0 on success.
- */
-static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp)
-{
-	int err;
-
-	if (readl(ulpi_vp->viewport_addr) & OMAP_ULPI_ACCESS)
-		return 0; /* already awake */
-
-	writel(OMAP_ULPI_ACCESS, ulpi_vp->viewport_addr);
-
-	err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS);
-	if (err)
-		debug("ULPI wakeup timed out\n");
-
-	return err;
-}
-
-/*
  * Issue a ULPI read/write request
  */
 static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
 {
 	int err;
 
-	err = ulpi_wakeup(ulpi_vp);
-	if (err)
-		return err;
-
 	writel(value, ulpi_vp->viewport_addr);
 
-	err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS);
+	err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
 	if (err)
 		debug("ULPI request timed out\n");
 
@@ -85,7 +61,7 @@ static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
 
 int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
 {
-	u32 val = ((ulpi_vp->port_num & 0xf) << 24) |
+	u32 val = (OMAP_ULPI_START | (ulpi_vp->port_num & 0xf) << 24) |
 			OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
 
 	return ulpi_request(ulpi_vp, val);
@@ -95,7 +71,7 @@ u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
 {
 	int err;
 	u32 val = ((ulpi_vp->port_num & 0xf) << 24) |
-			 OMAP_ULPI_WR_OPSEL | ((u32)reg << 16);
+			 OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
 
 	err = ulpi_request(ulpi_vp, val);
 	if (err)
-- 
1.7.9.5