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Subject[PATCH v8 05/13] spi: imx: fallback to PIO if dma setup failure
Date
Fallback to PIO in case dma setup failed. For example, sdma firmware not
updated but ERR009165 workaroud added in kernel.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
---
drivers/spi/spi-imx.c | 31 +++++++++++++++++++++++++++----
1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index f4f28a4..b7a85e3 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -71,6 +71,7 @@ struct spi_imx_devtype_data {
void (*reset)(struct spi_imx_data *);
void (*setup_wml)(struct spi_imx_data *);
void (*disable)(struct spi_imx_data *);
+ void (*disable_dma)(struct spi_imx_data *);
bool has_dmamode;
bool has_slavemode;
unsigned int fifo_size;
@@ -485,6 +486,11 @@ static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
}

+static void mx51_disable_dma(struct spi_imx_data *spi_imx)
+{
+ writel(0, spi_imx->base + MX51_ECSPI_DMA);
+}
+
static void mx51_ecspi_disable(struct spi_imx_data *spi_imx)
{
u32 ctrl;
@@ -987,6 +993,7 @@ static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
.rx_available = mx51_ecspi_rx_available,
.reset = mx51_ecspi_reset,
.setup_wml = mx51_setup_wml,
+ .disable_dma = mx51_disable_dma,
.fifo_size = 64,
.has_dmamode = true,
.dynamic_burst = true,
@@ -1001,6 +1008,7 @@ static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
.prepare_transfer = mx51_ecspi_prepare_transfer,
.trigger = mx51_ecspi_trigger,
.rx_available = mx51_ecspi_rx_available,
+ .disable_dma = mx51_disable_dma,
.reset = mx51_ecspi_reset,
.fifo_size = 64,
.has_dmamode = true,
@@ -1385,6 +1393,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_tx) {
dmaengine_terminate_all(master->dma_tx);
+ dmaengine_terminate_all(master->dma_rx);
return -EINVAL;
}

@@ -1498,6 +1507,7 @@ static int spi_imx_transfer(struct spi_device *spi,
struct spi_transfer *transfer)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
+ int ret;

/* flush rxfifo before transfer */
while (spi_imx->devtype_data->rx_available(spi_imx))
@@ -1506,10 +1516,23 @@ static int spi_imx_transfer(struct spi_device *spi,
if (spi_imx->slave_mode)
return spi_imx_pio_transfer_slave(spi, transfer);

- if (spi_imx->usedma)
- return spi_imx_dma_transfer(spi_imx, transfer);
- else
- return spi_imx_pio_transfer(spi, transfer);
+ /*
+ * fallback PIO mode if dma setup error happen, for example sdma
+ * firmware may not be updated as ERR009165 required.
+ */
+ if (spi_imx->usedma) {
+ ret = spi_imx_dma_transfer(spi_imx, transfer);
+ if (ret != -EINVAL)
+ return ret;
+
+ spi_imx->devtype_data->disable_dma(spi_imx);
+
+ spi_imx->usedma = false;
+ spi_imx->dynamic_burst = spi_imx->devtype_data->dynamic_burst;
+ dev_dbg(&spi->dev, "Fallback to PIO mode\n");
+ }
+
+ return spi_imx_pio_transfer(spi, transfer);
}

static int spi_imx_setup(struct spi_device *spi)
--
2.7.4
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