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spi: imx: fallback to PIO if dma setup failure 

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>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/1590006865-20900-6-git-send-email-yibin.gong@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Robin Gong 2020-05-21 04:34:17 +08:00 committed by Mark Brown
parent 8d72880819
commit bcd8e7761e
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 27 additions and 4 deletions
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31
drivers/spi/spi-imx.c
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@ -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)