From 303cff30d36e6a450c3ced1e3bed034038d87a86 Mon Sep 17 00:00:00 2001 From: Roman Volkov Date: Fri, 24 Jan 2014 16:18:03 +0400 Subject: [PATCH] ALSA: oxygen: modify the SPI writing function Modify the oxygen_write_spi() function to use the newly introduced oxygen_wait_spi() function. Change return value from void to int, so it can return error codes. Older drivers just ignore that return value, new drivers can check this value. We need to wait AFTER initiating the SPI transaction, otherwise read operation will not work. Signed-off-by: Roman Volkov Signed-off-by: Clemens Ladisch --- sound/pci/oxygen/oxygen.h | 2 +- sound/pci/oxygen/oxygen_io.c | 17 ++++++----------- 2 files changed, 7 insertions(+), 12 deletions(-) diff --git a/sound/pci/oxygen/oxygen.h b/sound/pci/oxygen/oxygen.h index 09a24b2..c10ab07 100644 --- a/sound/pci/oxygen/oxygen.h +++ b/sound/pci/oxygen/oxygen.h @@ -198,7 +198,7 @@ void oxygen_write_ac97(struct oxygen *chip, unsigned int codec, void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec, unsigned int index, u16 data, u16 mask); -void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data); +int oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data); void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data); void oxygen_reset_uart(struct oxygen *chip); diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c index 4b88c7a..3274907 100644 --- a/sound/pci/oxygen/oxygen_io.c +++ b/sound/pci/oxygen/oxygen_io.c @@ -212,23 +212,18 @@ static int oxygen_wait_spi(struct oxygen *chip) return -EIO; } -void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data) +int oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data) { - unsigned int count; - - /* should not need more than 30.72 us (24 * 1.28 us) */ - count = 10; - while ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) & OXYGEN_SPI_BUSY) - && count > 0) { - udelay(4); - --count; - } - + /* + * We need to wait AFTER initiating the SPI transaction, + * otherwise read operations will not work. + */ oxygen_write8(chip, OXYGEN_SPI_DATA1, data); oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8); if (control & OXYGEN_SPI_DATA_LENGTH_3) oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16); oxygen_write8(chip, OXYGEN_SPI_CONTROL, control); + return oxygen_wait_spi(chip); } EXPORT_SYMBOL(oxygen_write_spi); -- 2.7.4