The patch titled
spi: spi_bfin: update handling of delay-after-deselect
has been added to the -mm tree. Its filename is
spi-spi_bfin-update-handling-of-delay-after-deselect.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: spi: spi_bfin: update handling of delay-after-deselect
From: Bryan Wu <bryan.wu@xxxxxxxxxx>
Move cs_chg_udelay handling (specific to this driver) to cs_deactive(), fixing
a bug when some SPI LCD driver needs delay after cs_deactive.
Fix bug reported by Cameron Barfield <cbarfield@xxxxxxxxxxxxx>
https://blackfin.uclinux.org/gf/project/uclinux-dist/forum/?action=ForumBrowse&forum_id=39&_forum_action=ForumMessageBrowse&thread_id=23630&feedback=Message%20replied.
Cc: Cameron Barfield <cbarfield@xxxxxxxxxxxxx>
Signed-off-by: Bryan Wu <bryan.wu@xxxxxxxxxx>
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi_bfin5xx.c | 24 +++++++++---------------
include/asm-blackfin/bfin5xx_spi.h | 2 +-
2 files changed, 10 insertions(+), 16 deletions(-)
diff -puN drivers/spi/spi_bfin5xx.c~spi-spi_bfin-update-handling-of-delay-after-deselect drivers/spi/spi_bfin5xx.c
--- a/drivers/spi/spi_bfin5xx.c~spi-spi_bfin-update-handling-of-delay-after-deselect
+++ a/drivers/spi/spi_bfin5xx.c
@@ -132,7 +132,7 @@ struct chip_data {
u8 enable_dma;
u8 bits_per_word; /* 8 or 16 */
u8 cs_change_per_word;
- u8 cs_chg_udelay;
+ u16 cs_chg_udelay; /* Some devices require > 255usec delay */
void (*write) (struct driver_data *);
void (*read) (struct driver_data *);
void (*duplex) (struct driver_data *);
@@ -211,6 +211,10 @@ static void cs_deactive(struct driver_da
flag |= (chip->flag << 8);
write_FLAG(drv_data, flag);
+
+ /* Move delay here for consistency */
+ if (chip->cs_chg_udelay)
+ udelay(chip->cs_chg_udelay);
}
#define MAX_SPI_SSEL 7
@@ -307,10 +311,9 @@ static void u8_cs_chg_writer(struct driv
write_TDBR(drv_data, (*(u8 *) (drv_data->tx)));
while (read_STAT(drv_data) & BIT_STAT_TXS)
continue;
+
cs_deactive(drv_data, chip);
- if (chip->cs_chg_udelay)
- udelay(chip->cs_chg_udelay);
++drv_data->tx;
}
}
@@ -359,9 +362,6 @@ static void u8_cs_chg_reader(struct driv
while (drv_data->rx < drv_data->rx_end - 1) {
cs_deactive(drv_data, chip);
- if (chip->cs_chg_udelay)
- udelay(chip->cs_chg_udelay);
-
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
continue;
cs_active(drv_data, chip);
@@ -412,10 +412,9 @@ static void u8_cs_chg_duplex(struct driv
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
continue;
*(u8 *) (drv_data->rx) = read_RDBR(drv_data);
+
cs_deactive(drv_data, chip);
- if (chip->cs_chg_udelay)
- udelay(chip->cs_chg_udelay);
++drv_data->rx;
++drv_data->tx;
}
@@ -452,10 +451,9 @@ static void u16_cs_chg_writer(struct dri
write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
while ((read_STAT(drv_data) & BIT_STAT_TXS))
continue;
+
cs_deactive(drv_data, chip);
- if (chip->cs_chg_udelay)
- udelay(chip->cs_chg_udelay);
drv_data->tx += 2;
}
}
@@ -504,9 +502,6 @@ static void u16_cs_chg_reader(struct dri
while (drv_data->rx < drv_data->rx_end - 2) {
cs_deactive(drv_data, chip);
- if (chip->cs_chg_udelay)
- udelay(chip->cs_chg_udelay);
-
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
continue;
cs_active(drv_data, chip);
@@ -557,10 +552,9 @@ static void u16_cs_chg_duplex(struct dri
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
continue;
*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
+
cs_deactive(drv_data, chip);
- if (chip->cs_chg_udelay)
- udelay(chip->cs_chg_udelay);
drv_data->rx += 2;
drv_data->tx += 2;
}
diff -puN include/asm-blackfin/bfin5xx_spi.h~spi-spi_bfin-update-handling-of-delay-after-deselect include/asm-blackfin/bfin5xx_spi.h
--- a/include/asm-blackfin/bfin5xx_spi.h~spi-spi_bfin-update-handling-of-delay-after-deselect
+++ a/include/asm-blackfin/bfin5xx_spi.h
@@ -162,7 +162,7 @@ struct bfin5xx_spi_chip {
u8 enable_dma;
u8 bits_per_word;
u8 cs_change_per_word;
- u8 cs_chg_udelay;
+ u16 cs_chg_udelay; /* Some devices require 16-bit delays */
};
#endif /* _SPI_CHANNEL_H_ */
_
Patches currently in -mm which might be from bryan.wu@xxxxxxxxxx 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
spi-initial-bf54x-spi-support.patch
spi-bfin-spi-uses-portmux-calls.patch
spi-spi_bfin-cleanups-error-handling.patch
spi-spi_bfin-handles-spi_transfercs_change.patch
spi-spi_bfin-dont-bypass-spi-framework.patch
spi-spi_bfin-uses-platform-device-resources.patch
spi-spi_bfin-uses-portmux-for-additional-busses.patch
spi-spi_bfin-rearrange-portmux-calls.patch
spi-spi_bfin-change-handling-of-communication-parameters.patch
spi-spi_bfin-relocate-spin-waits.patch
spi-spi_bfin-handle-multiple-spi_masters.patch
spi-spi_bfin-bugfix-for-816-bit-word-sizes.patch
spi-spi_bfin-update-handling-of-delay-after-deselect.patch
spi-spi_bfin-resequence-dma-start-stop.patch
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