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spi: dw: Get rid of dma_inited flag 

This flag is superfluous in all cases where it's being used, i.e.
 * ->can_dma() won't be called without dma_inited == 1
 * DMA ->exit() callback can rely on txchan and rxchan variables

So, get rid of dma_inited flag.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200507115449.8093-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2020-05-07 14:54:49 +03:00 committed by Mark Brown
parent 140e45e1e6
commit a041e672cb
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
3 changed files with 14 additions and 17 deletions
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28
drivers/spi/spi-dw-mid.c
View File

@ -57,20 +57,21 @@ static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws)
dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, rx);
if (!dws->rxchan)
goto err_exit;
dws->master->dma_rx = dws->rxchan;
/* 2. Init tx channel */
tx->dma_dev = &dma_dev->dev;
dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, tx);
if (!dws->txchan)
goto free_rxchan;
dws->master->dma_rx = dws->rxchan;
dws->master->dma_tx = dws->txchan;
dws->dma_inited = 1;
return 0;
free_rxchan:
dma_release_channel(dws->rxchan);
dws->rxchan = NULL;
err_exit:
return -EBUSY;
}
@ -80,29 +81,31 @@ static int mid_spi_dma_init_generic(struct device *dev, struct dw_spi *dws)
dws->rxchan = dma_request_slave_channel(dev, "rx");
if (!dws->rxchan)
return -ENODEV;
dws->master->dma_rx = dws->rxchan;
dws->txchan = dma_request_slave_channel(dev, "tx");
if (!dws->txchan) {
dma_release_channel(dws->rxchan);
dws->rxchan = NULL;
return -ENODEV;
}
dws->master->dma_rx = dws->rxchan;
dws->master->dma_tx = dws->txchan;
dws->dma_inited = 1;
return 0;
}
static void mid_spi_dma_exit(struct dw_spi *dws)
{
if (!dws->dma_inited)
return;
if (dws->txchan) {
dmaengine_terminate_sync(dws->txchan);
dma_release_channel(dws->txchan);
}
dmaengine_terminate_sync(dws->txchan);
dma_release_channel(dws->txchan);
dmaengine_terminate_sync(dws->rxchan);
dma_release_channel(dws->rxchan);
if (dws->rxchan) {
dmaengine_terminate_sync(dws->rxchan);
dma_release_channel(dws->rxchan);
}
}
static irqreturn_t dma_transfer(struct dw_spi *dws)
@ -126,9 +129,6 @@ static bool mid_spi_can_dma(struct spi_controller *master,
{
struct dw_spi *dws = spi_controller_get_devdata(master);
if (!dws->dma_inited)
return false;
return xfer->len > dws->fifo_len;
}

2
drivers/spi/spi-dw.c
View File

@ -470,7 +470,6 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
dws->master = master;
dws->type = SSI_MOTO_SPI;
dws->dma_inited = 0;
dws->dma_addr = (dma_addr_t)(dws->paddr + DW_SPI_DR);
spin_lock_init(&dws->buf_lock);
@ -509,7 +508,6 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
ret = dws->dma_ops->dma_init(dev, dws);
if (ret) {
dev_warn(dev, "DMA init failed\n");
dws->dma_inited = 0;
} else {
master->can_dma = dws->dma_ops->can_dma;
}

1
drivers/spi/spi-dw.h
View File

@ -141,7 +141,6 @@ struct dw_spi {
u32 current_freq; /* frequency in hz */
/* DMA info */
int dma_inited;
struct dma_chan *txchan;
struct dma_chan *rxchan;
unsigned long dma_chan_busy;