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spi: tegra114: dump SPI registers during timeout 

This patch dumps SPI registers on transfer error or timeout for debug
purpose.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sowjanya Komatineni 2019-04-04 17:14:04 -07:00 committed by Mark Brown
parent e1a7d16730
commit a0253c8fa1
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GPG Key ID: 24D68B725D5487D0
1 changed files with 18 additions and 0 deletions
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18
drivers/spi/spi-tegra114.c
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@ -874,6 +874,20 @@ static void tegra_spi_transfer_end(struct spi_device *spi)
tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
}
static void tegra_spi_dump_regs(struct tegra_spi_data *tspi)
{
dev_dbg(tspi->dev, "============ SPI REGISTER DUMP ============\n");
dev_dbg(tspi->dev, "Command1: 0x%08x | Command2: 0x%08x\n",
tegra_spi_readl(tspi, SPI_COMMAND1),
tegra_spi_readl(tspi, SPI_COMMAND2));
dev_dbg(tspi->dev, "DMA_CTL: 0x%08x | DMA_BLK: 0x%08x\n",
tegra_spi_readl(tspi, SPI_DMA_CTL),
tegra_spi_readl(tspi, SPI_DMA_BLK));
dev_dbg(tspi->dev, "TRANS_STAT: 0x%08x | FIFO_STATUS: 0x%08x\n",
tegra_spi_readl(tspi, SPI_TRANS_STATUS),
tegra_spi_readl(tspi, SPI_FIFO_STATUS));
}
static int tegra_spi_transfer_one_message(struct spi_master *master,
struct spi_message *msg)
{
@ -920,6 +934,7 @@ static int tegra_spi_transfer_one_message(struct spi_master *master,
(tspi->cur_direction & DATA_DIR_RX))
dmaengine_terminate_all(tspi->rx_dma_chan);
ret = -EIO;
tegra_spi_dump_regs(tspi);
tegra_spi_flush_fifos(tspi);
reset_control_assert(tspi->rst);
udelay(2);
@ -930,6 +945,7 @@ static int tegra_spi_transfer_one_message(struct spi_master *master,
if (tspi->tx_status || tspi->rx_status) {
dev_err(tspi->dev, "Error in Transfer\n");
ret = -EIO;
tegra_spi_dump_regs(tspi);
goto complete_xfer;
}
msg->actual_length += xfer->len;
@ -971,6 +987,7 @@ static irqreturn_t handle_cpu_based_xfer(struct tegra_spi_data *tspi)
tspi->status_reg);
dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x\n",
tspi->command1_reg, tspi->dma_control_reg);
tegra_spi_dump_regs(tspi);
tegra_spi_flush_fifos(tspi);
complete(&tspi->xfer_completion);
spin_unlock_irqrestore(&tspi->lock, flags);
@ -1045,6 +1062,7 @@ static irqreturn_t handle_dma_based_xfer(struct tegra_spi_data *tspi)
tspi->status_reg);
dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x\n",
tspi->command1_reg, tspi->dma_control_reg);
tegra_spi_dump_regs(tspi);
tegra_spi_flush_fifos(tspi);
complete(&tspi->xfer_completion);
spin_unlock_irqrestore(&tspi->lock, flags);