diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-04-05 13:41:37 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-04-05 13:41:37 -0700 |
commit | 5003bc6cc60ef700692da9bf4d3953aa0770d300 (patch) | |
tree | 37da12e6c66c6d724b4fc7ce62f0ddfdaa7f9036 /drivers | |
parent | 1b5caa3eaa5f98a0d29ac46c7b545091520c5b26 (diff) | |
parent | cb39f732abbe4f38d2bef8e0a1c8bd5c242fc1b7 (diff) | |
download | linux-5003bc6cc60ef700692da9bf4d3953aa0770d300.tar.bz2 |
Merge tag 'spi-fix-v4.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi fixes from Mark Brown:
"A couple of driver specific fixes here that came in since the merge
window plus one core fix for locking in cases where a client driver
grabs a lock on the whole bus for an extended series of operations
that was introduced by the changes to support accelerated flash
operations"
* tag 'spi-fix-v4.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: rockchip: fix probe deferral handling
spi: omap2-mcspi: fix dma transfer for vmalloced buffer
spi: fix possible deadlock between internal bus locks and bus_lock_flag
spi: imx: Fix possible NULL pointer deref
spi: imx: only do necessary changes to ECSPIx_CONFIGREG
spi: rockchip: Spelling s/divsor/divisor/
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/spi/spi-imx.c | 16 | ||||
-rw-r--r-- | drivers/spi/spi-omap2-mcspi.c | 62 | ||||
-rw-r--r-- | drivers/spi/spi-rockchip.c | 16 | ||||
-rw-r--r-- | drivers/spi/spi.c | 4 |
4 files changed, 43 insertions, 55 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index e7a19be87c38..50769078e72e 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -211,11 +211,15 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); - unsigned int bpw = transfer->bits_per_word; + unsigned int bpw; if (!master->dma_rx) return false; + if (!transfer) + return false; + + bpw = transfer->bits_per_word; if (!bpw) bpw = spi->bits_per_word; @@ -333,8 +337,9 @@ static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx) static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, struct spi_imx_config *config) { - u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0; + u32 ctrl = MX51_ECSPI_CTRL_ENABLE; u32 clk = config->speed_hz, delay, reg; + u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG); /* * The hardware seems to have a race condition when changing modes. The @@ -358,13 +363,20 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, if (config->mode & SPI_CPHA) cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs); + else + cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(config->cs); if (config->mode & SPI_CPOL) { cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs); cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs); + } else { + cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(config->cs); + cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(config->cs); } if (config->mode & SPI_CS_HIGH) cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs); + else + cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(config->cs); if (spi_imx->usedma) ctrl |= MX51_ECSPI_CTRL_SMC; diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c index 0caa3c8bef46..43a02e377b3b 100644 --- a/drivers/spi/spi-omap2-mcspi.c +++ b/drivers/spi/spi-omap2-mcspi.c @@ -423,16 +423,12 @@ static void omap2_mcspi_tx_dma(struct spi_device *spi, if (mcspi_dma->dma_tx) { struct dma_async_tx_descriptor *tx; - struct scatterlist sg; dmaengine_slave_config(mcspi_dma->dma_tx, &cfg); - sg_init_table(&sg, 1); - sg_dma_address(&sg) = xfer->tx_dma; - sg_dma_len(&sg) = xfer->len; - - tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1, - DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, xfer->tx_sg.sgl, + xfer->tx_sg.nents, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (tx) { tx->callback = omap2_mcspi_tx_callback; tx->callback_param = spi; @@ -478,20 +474,15 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer, if (mcspi_dma->dma_rx) { struct dma_async_tx_descriptor *tx; - struct scatterlist sg; dmaengine_slave_config(mcspi_dma->dma_rx, &cfg); if ((l & OMAP2_MCSPI_CHCONF_TURBO) && mcspi->fifo_depth == 0) dma_count -= es; - sg_init_table(&sg, 1); - sg_dma_address(&sg) = xfer->rx_dma; - sg_dma_len(&sg) = dma_count; - - tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, &sg, 1, - DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | - DMA_CTRL_ACK); + tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, xfer->rx_sg.sgl, + xfer->rx_sg.nents, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (tx) { tx->callback = omap2_mcspi_rx_callback; tx->callback_param = spi; @@ -505,8 +496,6 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer, omap2_mcspi_set_dma_req(spi, 1, 1); wait_for_completion(&mcspi_dma->dma_rx_completion); - dma_unmap_single(mcspi->dev, xfer->rx_dma, count, - DMA_FROM_DEVICE); if (mcspi->fifo_depth > 0) return count; @@ -619,8 +608,6 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer) if (tx != NULL) { wait_for_completion(&mcspi_dma->dma_tx_completion); - dma_unmap_single(mcspi->dev, xfer->tx_dma, xfer->len, - DMA_TO_DEVICE); if (mcspi->fifo_depth > 0) { irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS; @@ -1087,6 +1074,16 @@ static void omap2_mcspi_cleanup(struct spi_device *spi) gpio_free(spi->cs_gpio); } +static bool omap2_mcspi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + if (xfer->len < DMA_MIN_BYTES) + return false; + + return true; +} + static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi, struct spi_device *spi, struct spi_transfer *t) { @@ -1268,32 +1265,6 @@ static int omap2_mcspi_transfer_one(struct spi_master *master, return -EINVAL; } - if (len < DMA_MIN_BYTES) - goto skip_dma_map; - - if (mcspi_dma->dma_tx && tx_buf != NULL) { - t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf, - len, DMA_TO_DEVICE); - if (dma_mapping_error(mcspi->dev, t->tx_dma)) { - dev_dbg(mcspi->dev, "dma %cX %d bytes error\n", - 'T', len); - return -EINVAL; - } - } - if (mcspi_dma->dma_rx && rx_buf != NULL) { - t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len, - DMA_FROM_DEVICE); - if (dma_mapping_error(mcspi->dev, t->rx_dma)) { - dev_dbg(mcspi->dev, "dma %cX %d bytes error\n", - 'R', len); - if (tx_buf != NULL) - dma_unmap_single(mcspi->dev, t->tx_dma, - len, DMA_TO_DEVICE); - return -EINVAL; - } - } - -skip_dma_map: return omap2_mcspi_work_one(mcspi, spi, t); } @@ -1377,6 +1348,7 @@ static int omap2_mcspi_probe(struct platform_device *pdev) master->transfer_one = omap2_mcspi_transfer_one; master->set_cs = omap2_mcspi_set_cs; master->cleanup = omap2_mcspi_cleanup; + master->can_dma = omap2_mcspi_can_dma; master->dev.of_node = node; master->max_speed_hz = OMAP2_MCSPI_MAX_FREQ; master->min_speed_hz = OMAP2_MCSPI_MAX_FREQ >> 15; diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 8f50a4020f6f..6c6c0013ec7a 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -534,7 +534,7 @@ static void rockchip_spi_config(struct rockchip_spi *rs) if (WARN_ON(rs->speed > MAX_SCLK_OUT)) rs->speed = MAX_SCLK_OUT; - /* the minimum divsor is 2 */ + /* the minimum divisor is 2 */ if (rs->max_freq < 2 * rs->speed) { clk_set_rate(rs->spiclk, 2 * rs->speed); rs->max_freq = clk_get_rate(rs->spiclk); @@ -730,23 +730,27 @@ static int rockchip_spi_probe(struct platform_device *pdev) master->transfer_one = rockchip_spi_transfer_one; master->handle_err = rockchip_spi_handle_err; - rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx"); - if (IS_ERR_OR_NULL(rs->dma_tx.ch)) { + rs->dma_tx.ch = dma_request_chan(rs->dev, "tx"); + if (IS_ERR(rs->dma_tx.ch)) { /* Check tx to see if we need defer probing driver */ if (PTR_ERR(rs->dma_tx.ch) == -EPROBE_DEFER) { ret = -EPROBE_DEFER; goto err_get_fifo_len; } dev_warn(rs->dev, "Failed to request TX DMA channel\n"); + rs->dma_tx.ch = NULL; } - rs->dma_rx.ch = dma_request_slave_channel(rs->dev, "rx"); - if (!rs->dma_rx.ch) { - if (rs->dma_tx.ch) { + rs->dma_rx.ch = dma_request_chan(rs->dev, "rx"); + if (IS_ERR(rs->dma_rx.ch)) { + if (PTR_ERR(rs->dma_rx.ch) == -EPROBE_DEFER) { dma_release_channel(rs->dma_tx.ch); rs->dma_tx.ch = NULL; + ret = -EPROBE_DEFER; + goto err_get_fifo_len; } dev_warn(rs->dev, "Failed to request RX DMA channel\n"); + rs->dma_rx.ch = NULL; } if (rs->dma_tx.ch && rs->dma_rx.ch) { diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index de2f2f90d799..0239b45eed92 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1209,7 +1209,7 @@ static void spi_pump_messages(struct kthread_work *work) struct spi_master *master = container_of(work, struct spi_master, pump_messages); - __spi_pump_messages(master, true, false); + __spi_pump_messages(master, true, master->bus_lock_flag); } static int spi_init_queue(struct spi_master *master) @@ -2853,7 +2853,7 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message, */ int spi_sync(struct spi_device *spi, struct spi_message *message) { - return __spi_sync(spi, message, 0); + return __spi_sync(spi, message, spi->master->bus_lock_flag); } EXPORT_SYMBOL_GPL(spi_sync); |