spi/tegra20-slink: Move first transfer preparation to prepare_message
This is more idiomatic for the factored out message processing and gives a
small simplification of the code since we always set the per-transfer
parameters in the same fashion.
Signed-off-by: Mark Brown <broonie@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index 3576fcb..14292c5 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -196,7 +196,6 @@
u32 rx_status;
u32 status_reg;
bool is_packed;
- bool is_first_msg;
unsigned long packed_size;
u32 command_reg;
@@ -708,7 +707,7 @@
}
static int tegra_slink_start_transfer_one(struct spi_device *spi,
- struct spi_transfer *t, bool is_first_of_msg)
+ struct spi_transfer *t)
{
struct tegra_slink_data *tspi = spi_master_get_devdata(spi->master);
u32 speed;
@@ -732,32 +731,12 @@
tspi->curr_xfer = t;
total_fifo_words = tegra_slink_calculate_curr_xfer_param(spi, tspi, t);
- if (is_first_of_msg) {
- tegra_slink_clear_status(tspi);
+ command = tspi->command_reg;
+ command &= ~SLINK_BIT_LENGTH(~0);
+ command |= SLINK_BIT_LENGTH(bits_per_word - 1);
- command = tspi->def_command_reg;
- command |= SLINK_BIT_LENGTH(bits_per_word - 1);
- command |= SLINK_CS_SW | SLINK_CS_VALUE;
-
- command2 = tspi->def_command2_reg;
- command2 |= SLINK_SS_EN_CS(spi->chip_select);
-
- command &= ~SLINK_MODES;
- if (spi->mode & SPI_CPHA)
- command |= SLINK_CK_SDA;
-
- if (spi->mode & SPI_CPOL)
- command |= SLINK_IDLE_SCLK_DRIVE_HIGH;
- else
- command |= SLINK_IDLE_SCLK_DRIVE_LOW;
- } else {
- command = tspi->command_reg;
- command &= ~SLINK_BIT_LENGTH(~0);
- command |= SLINK_BIT_LENGTH(bits_per_word - 1);
-
- command2 = tspi->command2_reg;
- command2 &= ~(SLINK_RXEN | SLINK_TXEN);
- }
+ command2 = tspi->command2_reg;
+ command2 &= ~(SLINK_RXEN | SLINK_TXEN);
tegra_slink_writel(tspi, command, SLINK_COMMAND);
tspi->command_reg = command;
@@ -828,8 +807,24 @@
struct spi_message *msg)
{
struct tegra_slink_data *tspi = spi_master_get_devdata(master);
+ struct spi_device *spi = msg->spi;
- tspi->is_first_msg = true;
+ tegra_slink_clear_status(tspi);
+
+ tspi->command_reg = tspi->def_command_reg;
+ tspi->command_reg |= SLINK_CS_SW | SLINK_CS_VALUE;
+
+ tspi->command2_reg = tspi->def_command2_reg;
+ tspi->command2_reg |= SLINK_SS_EN_CS(spi->chip_select);
+
+ tspi->command_reg &= ~SLINK_MODES;
+ if (spi->mode & SPI_CPHA)
+ tspi->command_reg |= SLINK_CK_SDA;
+
+ if (spi->mode & SPI_CPOL)
+ tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_HIGH;
+ else
+ tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_LOW;
return 0;
}
@@ -842,13 +837,13 @@
int ret;
INIT_COMPLETION(tspi->xfer_completion);
- ret = tegra_slink_start_transfer_one(spi, xfer, tspi->is_first_msg);
+ ret = tegra_slink_start_transfer_one(spi, xfer);
if (ret < 0) {
dev_err(tspi->dev,
"spi can not start transfer, err %d\n", ret);
return ret;
}
- tspi->is_first_msg = false;
+
ret = wait_for_completion_timeout(&tspi->xfer_completion,
SLINK_DMA_TIMEOUT);
if (WARN_ON(ret == 0)) {