diff options
Diffstat (limited to 'drivers/spi/spi-tegra20-slink.c')
| -rw-r--r-- | drivers/spi/spi-tegra20-slink.c | 55 |
1 files changed, 25 insertions, 30 deletions
diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c index 3576fcb3f79b..14292c53c030 100644 --- a/drivers/spi/spi-tegra20-slink.c +++ b/drivers/spi/spi-tegra20-slink.c @@ -196,7 +196,6 @@ struct tegra_slink_data { 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 void tegra_slink_deinit_dma_param(struct tegra_slink_data *tspi, } 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 @@ static int tegra_slink_start_transfer_one(struct spi_device *spi, 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 @@ static int tegra_slink_prepare_message(struct spi_master *master, 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 @@ static int tegra_slink_transfer_one(struct spi_master *master, 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)) { |