diff options
| author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2019-03-28 11:16:26 +0100 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2019-03-28 11:16:26 +0100 |
| commit | 6f01eb5bf8e8110ab5f3a8e7b0f3abf19a205e4b (patch) | |
| tree | 4b3147335ed97e4b487fd84bcb7a959a38d9656e /drivers/spi/spi-bcm2835.c | |
| parent | 8f234193b8cc35c44614e4a4b05f2d920ff562e4 (diff) | |
| parent | 6b50202a4d53bf527c640467bcff68b50a5e38a2 (diff) | |
Merge tag 'v4.4.177' into toradex_vf_4.4-nextColibri-VF_LXDE-Image_2.8b6.183-20190331
This is the 4.4.177 stable release
Diffstat (limited to 'drivers/spi/spi-bcm2835.c')
| -rw-r--r-- | drivers/spi/spi-bcm2835.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c index cf04960cc3e6..1a1368f5863c 100644 --- a/drivers/spi/spi-bcm2835.c +++ b/drivers/spi/spi-bcm2835.c @@ -88,7 +88,7 @@ struct bcm2835_spi { u8 *rx_buf; int tx_len; int rx_len; - bool dma_pending; + unsigned int dma_pending; }; static inline u32 bcm2835_rd(struct bcm2835_spi *bs, unsigned reg) @@ -155,8 +155,7 @@ static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id) /* Write as many bytes as possible to FIFO */ bcm2835_wr_fifo(bs); - /* based on flags decide if we can finish the transfer */ - if (bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_DONE) { + if (!bs->rx_len) { /* Transfer complete - reset SPI HW */ bcm2835_spi_reset_hw(master); /* wake up the framework */ @@ -233,10 +232,9 @@ static void bcm2835_spi_dma_done(void *data) * is called the tx-dma must have finished - can't get to this * situation otherwise... */ - dmaengine_terminate_all(master->dma_tx); - - /* mark as no longer pending */ - bs->dma_pending = 0; + if (cmpxchg(&bs->dma_pending, true, false)) { + dmaengine_terminate_all(master->dma_tx); + } /* and mark as completed */; complete(&master->xfer_completion); @@ -342,6 +340,7 @@ static int bcm2835_spi_transfer_one_dma(struct spi_master *master, if (ret) { /* need to reset on errors */ dmaengine_terminate_all(master->dma_tx); + bs->dma_pending = false; bcm2835_spi_reset_hw(master); return ret; } @@ -617,10 +616,9 @@ static void bcm2835_spi_handle_err(struct spi_master *master, struct bcm2835_spi *bs = spi_master_get_devdata(master); /* if an error occurred and we have an active dma, then terminate */ - if (bs->dma_pending) { + if (cmpxchg(&bs->dma_pending, true, false)) { dmaengine_terminate_all(master->dma_tx); dmaengine_terminate_all(master->dma_rx); - bs->dma_pending = 0; } /* and reset */ bcm2835_spi_reset_hw(master); |