+ spi_bfin-wait-for-tx-to-complete-on-full-duplex-paths.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     spi_bfin: wait for tx to complete on full duplex paths
has been added to the -mm tree.  Its filename is
     spi_bfin-wait-for-tx-to-complete-on-full-duplex-paths.patch

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------------------------------------------------------
Subject: spi_bfin: wait for tx to complete on full duplex paths
From: Bryan Wu <bryan.wu@analog.com>

Full duplex SPI operation should not read a dummy byte at the first transfer. 
Bug and fix by Jean-Christian de Rivaz <jc@eclis.ch>:

http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3678

Signed-off-by: Jean-Christian de Rivaz <jc@eclis.ch>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/spi/spi_bfin5xx.c |   18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff -puN drivers/spi/spi_bfin5xx.c~spi_bfin-wait-for-tx-to-complete-on-full-duplex-paths drivers/spi/spi_bfin5xx.c
--- a/drivers/spi/spi_bfin5xx.c~spi_bfin-wait-for-tx-to-complete-on-full-duplex-paths
+++ a/drivers/spi/spi_bfin5xx.c
@@ -358,14 +358,10 @@ static void u8_cs_chg_reader(struct driv
 
 static void u8_duplex(struct driver_data *drv_data)
 {
-	/* poll for SPI completion before start */
-	while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
-		cpu_relax();
-
 	/* in duplex mode, clk is triggered by writing of TDBR */
 	while (drv_data->rx < drv_data->rx_end) {
 		write_TDBR(drv_data, (*(u8 *) (drv_data->tx)));
-		while (read_STAT(drv_data) & BIT_STAT_TXS)
+		while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
 			cpu_relax();
 		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
 			cpu_relax();
@@ -495,14 +491,10 @@ static void u16_cs_chg_reader(struct dri
 
 static void u16_duplex(struct driver_data *drv_data)
 {
-	/* poll for SPI completion before start */
-	while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
-		cpu_relax();
-
 	/* in duplex mode, clk is triggered by writing of TDBR */
 	while (drv_data->tx < drv_data->tx_end) {
 		write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
-		while (read_STAT(drv_data) & BIT_STAT_TXS)
+		while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
 			cpu_relax();
 		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
 			cpu_relax();
@@ -516,15 +508,11 @@ static void u16_cs_chg_duplex(struct dri
 {
 	struct chip_data *chip = drv_data->cur_chip;
 
-	/* poll for SPI completion before start */
-	while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
-		cpu_relax();
-
 	while (drv_data->tx < drv_data->tx_end) {
 		cs_active(drv_data, chip);
 
 		write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
-		while (read_STAT(drv_data) & BIT_STAT_TXS)
+		while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
 			cpu_relax();
 		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
 			cpu_relax();
_

Patches currently in -mm which might be from bryan.wu@analog.com are

origin.patch
git-mtd.patch
blackfin-serial-driver-this-driver-enable-sports-on-blackfin-emulate-uart.patch
kernel-printkc-concerns-about-the-console-handover.patch
remove-mm_ptovvtop.patch
spi_bfin-remove-useless-fault-path.patch
spi_bfin-use-more-useful-gpio-labels.patch
spi_bfin-wait-for-tx-to-complete-on-some-cs_chg-paths.patch
spi_bfin-wait-for-tx-to-complete-on-full-duplex-paths.patch
spi_bfin-wait-for-tx-to-complete-on-write-paths.patch
spi_bfin-headers-are-not-for-changelogs.patch
blackfin-rtc-driver-the-frequency-function-is-in-units-of-hz-not-units-of-seconds-so-lock-our-driver-down-to-1-hz.patch
blackfin-rtc-driver-we-pass-in-a-struct-device-to-the-irq-handler-not-a-struct-platform_device-so-fix-the-irq-handler.patch
blackfin-rtc-driver-cleanup-proc-handler-we-dont-need-rtc-reg-dump-now-that-we-have-mmr-filesystem-in-sysfs.patch
blackfin-rtc-driver-use-dev_dbg-rather-than-pr_stamp.patch
blackfin-rtc-driver-read_alarm-checks-the-enabled-field-not-the-pending-field.patch
blackfin-rtc-driver-shave-off-another-memcpy-by-using-assignment.patch
blackfin-rtc-driver-convert-sync-wait-to-use-the-irq-write-complete-notice.patch
sanitize-the-type-of-struct-useru_ar0.patch
add-cmpxchg_local-to-blackfin-replace-__cmpxchg-by-generic-cmpxchg.patch
d_path-make-d_path-use-a-struct-path.patch
procfs-constify-function-pointer-tables.patch