diff mbox series

[2/2] spi: spi-omap2-mcspi: Use EOW interrupt for completion when DMA enabled

Message ID 20220822091531.27827-3-vaishnav.a@ti.com (mailing list archive)
State New, archived
Headers show
Series spi: spi-omap2-mcspi: Use EOW interrupt for transfer completion | expand

Commit Message

Vaishnav Achath Aug. 22, 2022, 9:15 a.m. UTC 
In MCSPI controller EOW interrupt is triggered when the channel has
transmitted the set number of bytes in MCSPI_XFERLEVEL[31-16] WCNT,
this can be used to signal the completion of a TX/RX when the internal
FIFO is enabled, when DMA is enabled the internal FIFO is always enabled.
Waiting for the DMA completion adds unpredictable delays due to the
non-realtime completion calculation mechanism in k3-udma driver.

This commit removes the dma_tx_completion and dma_rx_completion and
relies on the MCSPI controller EOW interrupt to signal transaction
completion.This fixes the real-time performance issues in master and
slave mode when DMA was enabled which resulted from the DMA completion
calculation delays.

Since the MCSPI driver now uses internal mechanism to identify a transfer
completion we disable the TX and RX DMA completion callback and remove
DMA_PREP_INTERRUPT.

Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>
---
 drivers/spi/spi-omap2-mcspi.c | 141 +++++++++-------------------------
 1 file changed, 36 insertions(+), 105 deletions(-)

Comments

kernel test robot Aug. 22, 2022, 1:14 p.m. UTC | #1 
Hi Vaishnav,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on vkoul-dmaengine/next]
[also build test WARNING on broonie-spi/for-next linus/master v6.0-rc2 next-20220822]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Vaishnav-Achath/spi-spi-omap2-mcspi-Use-EOW-interrupt-for-transfer-completion/20220822-171807
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next
config: arc-randconfig-r043-20220821 (https://download.01.org/0day-ci/archive/20220822/202208222100.SKGSz2m9-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/492d819558f7cb9fb64d860042c6ca17a054c3f7
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Vaishnav-Achath/spi-spi-omap2-mcspi-Use-EOW-interrupt-for-transfer-completion/20220822-171807
        git checkout 492d819558f7cb9fb64d860042c6ca17a054c3f7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash drivers/spi/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/spi/spi-omap2-mcspi.c: In function 'omap2_mcspi_txrx_dma':
>> drivers/spi/spi-omap2-mcspi.c:549:34: warning: variable 'mcspi_dma' set but not used [-Wunused-but-set-variable]
     549 |         struct omap2_mcspi_dma  *mcspi_dma;
         |                                  ^~~~~~~~~


vim +/mcspi_dma +549 drivers/spi/spi-omap2-mcspi.c

d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  543  
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  544  static unsigned
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  545  omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  546  {
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  547  	struct omap2_mcspi	*mcspi;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  548  	struct omap2_mcspi_cs	*cs = spi->controller_state;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11 @549  	struct omap2_mcspi_dma  *mcspi_dma;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  550  	unsigned int		count;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  551  	u8			*rx;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  552  	const u8		*tx;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  553  	struct dma_slave_config	cfg;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  554  	enum dma_slave_buswidth width;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  555  	unsigned es;
e47a682ace0cd5 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-11-06  556  	void __iomem		*chstat_reg;
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  557  	int			wait_res;
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  558  	int ret;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  559  
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  560  	mcspi = spi_master_get_devdata(spi->master);
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  561  	mcspi_dma = &mcspi->dma_channels[spi->chip_select];
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  562  
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  563  	if (cs->word_len <= 8) {
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  564  		width = DMA_SLAVE_BUSWIDTH_1_BYTE;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  565  		es = 1;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  566  	} else if (cs->word_len <= 16) {
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  567  		width = DMA_SLAVE_BUSWIDTH_2_BYTES;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  568  		es = 2;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  569  	} else {
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  570  		width = DMA_SLAVE_BUSWIDTH_4_BYTES;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  571  		es = 4;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  572  	}
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  573  
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  574  	count = xfer->len;
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  575  
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  576  	memset(&cfg, 0, sizeof(cfg));
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  577  	cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  578  	cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  579  	cfg.src_addr_width = width;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  580  	cfg.dst_addr_width = width;
baf8b9f8d260c5 drivers/spi/spi-omap2-mcspi.c Vignesh R       2019-01-15  581  	cfg.src_maxburst = 1;
baf8b9f8d260c5 drivers/spi/spi-omap2-mcspi.c Vignesh R       2019-01-15  582  	cfg.dst_maxburst = 1;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  583  
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  584  	rx = xfer->rx_buf;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  585  	tx = xfer->tx_buf;
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  586  
89e8b9cb846515 drivers/spi/spi-omap2-mcspi.c Vignesh R       2018-10-15  587  	mcspi->slave_aborted = false;
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  588  	reinit_completion(&mcspi->txrxdone);
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  589  	mcspi_write_reg(spi->master, OMAP2_MCSPI_IRQENABLE,	OMAP2_MCSPI_IRQSTATUS_EOW);
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  590  	if (tx)
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  591  		omap2_mcspi_tx_dma(spi, xfer, cfg);
d7b4394e780b02 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-09-11  592  
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  593  	if (rx)
e47a682ace0cd5 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-11-06  594  		count = omap2_mcspi_rx_dma(spi, xfer, cfg, es);
e47a682ace0cd5 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-11-06  595  
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  596  	ret = mcspi_wait_for_completion(mcspi, &mcspi->txrxdone);
89e8b9cb846515 drivers/spi/spi-omap2-mcspi.c Vignesh R       2018-10-15  597  	omap2_mcspi_set_dma_req(spi, 0, 0);
89e8b9cb846515 drivers/spi/spi-omap2-mcspi.c Vignesh R       2018-10-15  598  	if (ret || mcspi->slave_aborted)
89e8b9cb846515 drivers/spi/spi-omap2-mcspi.c Vignesh R       2018-10-15  599  		return 0;
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  600  
e47a682ace0cd5 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-11-06  601  	/* for TX_ONLY mode, be sure all words have shifted out */
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  602  	if (tx && !rx) {
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  603  		chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  604  		if (mcspi->fifo_depth > 0) {
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  605  			wait_res = mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXFFE);
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  606  			if (wait_res < 0)
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  607  				dev_err(&spi->dev, "TXFFE timed out\n");
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  608  		} else {
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  609  			wait_res = mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXS);
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  610  			if (wait_res < 0)
e47a682ace0cd5 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-11-06  611  				dev_err(&spi->dev, "TXS timed out\n");
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  612  		}
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  613  		if (wait_res >= 0 && (mcspi_wait_for_reg_bit(chstat_reg,
d33f473dcd8e69 drivers/spi/spi-omap2-mcspi.c Illia Smyrnov   2013-06-17  614  							     OMAP2_MCSPI_CHSTAT_EOT) < 0))
e47a682ace0cd5 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-11-06  615  			dev_err(&spi->dev, "EOT timed out\n");
e47a682ace0cd5 drivers/spi/spi-omap2-mcspi.c Shubhrajyoti D  2012-11-06  616  	}
492d819558f7cb drivers/spi/spi-omap2-mcspi.c Vaishnav Achath 2022-08-22  617  
ccdc7bf925731e drivers/spi/omap2_mcspi.c     Samuel Ortiz    2007-07-17  618  	return count;
ccdc7bf925731e drivers/spi/omap2_mcspi.c     Samuel Ortiz    2007-07-17  619  }
ccdc7bf925731e drivers/spi/omap2_mcspi.c     Samuel Ortiz    2007-07-17  620
diff mbox series

Patch

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index c48d02bb7013..8680465533e0 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -91,10 +91,6 @@ 
 struct omap2_mcspi_dma {
 	struct dma_chan *dma_tx;
 	struct dma_chan *dma_rx;
-
-	struct completion dma_tx_completion;
-	struct completion dma_rx_completion;
-
 	char dma_rx_ch_name[14];
 	char dma_tx_ch_name[14];
 };
@@ -116,7 +112,7 @@  struct omap2_mcspi_regs {
 };
 
 struct omap2_mcspi {
-	struct completion	txdone;
+	struct completion	txrxdone;
 	struct spi_master	*master;
 	/* Virtual base address of the controller */
 	void __iomem		*base;
@@ -375,30 +371,6 @@  static int mcspi_wait_for_completion(struct  omap2_mcspi *mcspi,
 	return 0;
 }
 
-static void omap2_mcspi_rx_callback(void *data)
-{
-	struct spi_device *spi = data;
-	struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
-	struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select];
-
-	/* We must disable the DMA RX request */
-	omap2_mcspi_set_dma_req(spi, 1, 0);
-
-	complete(&mcspi_dma->dma_rx_completion);
-}
-
-static void omap2_mcspi_tx_callback(void *data)
-{
-	struct spi_device *spi = data;
-	struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
-	struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select];
-
-	/* We must disable the DMA TX request */
-	omap2_mcspi_set_dma_req(spi, 0, 0);
-
-	complete(&mcspi_dma->dma_tx_completion);
-}
-
 static void omap2_mcspi_tx_dma(struct spi_device *spi,
 				struct spi_transfer *xfer,
 				struct dma_slave_config cfg)
@@ -413,12 +385,9 @@  static void omap2_mcspi_tx_dma(struct spi_device *spi,
 	dmaengine_slave_config(mcspi_dma->dma_tx, &cfg);
 
 	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);
+					xfer->tx_sg.nents, DMA_MEM_TO_DEV, DMA_CTRL_ACK);
+
 	if (tx) {
-		tx->callback = omap2_mcspi_tx_callback;
-		tx->callback_param = spi;
 		dmaengine_submit(tx);
 	} else {
 		/* FIXME: fall back to PIO? */
@@ -500,11 +469,9 @@  omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
 	}
 
 	tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, sg_out[0],
-				     out_mapped_nents[0], DMA_DEV_TO_MEM,
-				     DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+				     out_mapped_nents[0], DMA_DEV_TO_MEM, DMA_CTRL_ACK);
+
 	if (tx) {
-		tx->callback = omap2_mcspi_rx_callback;
-		tx->callback_param = spi;
 		dmaengine_submit(tx);
 	} else {
 		/* FIXME: fall back to PIO? */
@@ -513,10 +480,10 @@  omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
 	dma_async_issue_pending(mcspi_dma->dma_rx);
 	omap2_mcspi_set_dma_req(spi, 1, 1);
 
-	ret = mcspi_wait_for_completion(mcspi, &mcspi_dma->dma_rx_completion);
+	ret = mcspi_wait_for_completion(mcspi, &mcspi->txrxdone);
+	omap2_mcspi_set_dma_req(spi, 1, 0);
 	if (ret || mcspi->slave_aborted) {
 		dmaengine_terminate_sync(mcspi_dma->dma_rx);
-		omap2_mcspi_set_dma_req(spi, 1, 0);
 		return 0;
 	}
 
@@ -587,8 +554,8 @@  omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
 	enum dma_slave_buswidth width;
 	unsigned es;
 	void __iomem		*chstat_reg;
-	void __iomem            *irqstat_reg;
 	int			wait_res;
+	int ret;
 
 	mcspi = spi_master_get_devdata(spi->master);
 	mcspi_dma = &mcspi->dma_channels[spi->chip_select];
@@ -618,68 +585,36 @@  omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
 	tx = xfer->tx_buf;
 
 	mcspi->slave_aborted = false;
-	reinit_completion(&mcspi_dma->dma_tx_completion);
-	reinit_completion(&mcspi_dma->dma_rx_completion);
-	reinit_completion(&mcspi->txdone);
-	if (tx) {
-		/* Enable EOW IRQ to know end of tx in slave mode */
-		if (spi_controller_is_slave(spi->master))
-			mcspi_write_reg(spi->master,
-					OMAP2_MCSPI_IRQENABLE,
-					OMAP2_MCSPI_IRQSTATUS_EOW);
+	reinit_completion(&mcspi->txrxdone);
+	mcspi_write_reg(spi->master, OMAP2_MCSPI_IRQENABLE,	OMAP2_MCSPI_IRQSTATUS_EOW);
+	if (tx)
 		omap2_mcspi_tx_dma(spi, xfer, cfg);
-	}
 
-	if (rx != NULL)
+	if (rx)
 		count = omap2_mcspi_rx_dma(spi, xfer, cfg, es);
 
-	if (tx != NULL) {
-		int ret;
-
-		ret = mcspi_wait_for_completion(mcspi, &mcspi_dma->dma_tx_completion);
-		if (ret || mcspi->slave_aborted) {
-			dmaengine_terminate_sync(mcspi_dma->dma_tx);
-			omap2_mcspi_set_dma_req(spi, 0, 0);
-			return 0;
-		}
-
-		if (spi_controller_is_slave(mcspi->master)) {
-			ret = mcspi_wait_for_completion(mcspi, &mcspi->txdone);
-			if (ret || mcspi->slave_aborted)
-				return 0;
-		}
+	ret = mcspi_wait_for_completion(mcspi, &mcspi->txrxdone);
+	omap2_mcspi_set_dma_req(spi, 0, 0);
+	if (ret || mcspi->slave_aborted)
+		return 0;
 
+	/* for TX_ONLY mode, be sure all words have shifted out */
+	if (tx && !rx) {
+		chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
 		if (mcspi->fifo_depth > 0) {
-			irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS;
-
-			if (mcspi_wait_for_reg_bit(irqstat_reg,
-						OMAP2_MCSPI_IRQSTATUS_EOW) < 0)
-				dev_err(&spi->dev, "EOW timed out\n");
-
-			mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQSTATUS,
-					OMAP2_MCSPI_IRQSTATUS_EOW);
-		}
-
-		/* for TX_ONLY mode, be sure all words have shifted out */
-		if (rx == NULL) {
-			chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
-			if (mcspi->fifo_depth > 0) {
-				wait_res = mcspi_wait_for_reg_bit(chstat_reg,
-						OMAP2_MCSPI_CHSTAT_TXFFE);
-				if (wait_res < 0)
-					dev_err(&spi->dev, "TXFFE timed out\n");
-			} else {
-				wait_res = mcspi_wait_for_reg_bit(chstat_reg,
-						OMAP2_MCSPI_CHSTAT_TXS);
-				if (wait_res < 0)
-					dev_err(&spi->dev, "TXS timed out\n");
-			}
-			if (wait_res >= 0 &&
-				(mcspi_wait_for_reg_bit(chstat_reg,
-					OMAP2_MCSPI_CHSTAT_EOT) < 0))
-				dev_err(&spi->dev, "EOT timed out\n");
+			wait_res = mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXFFE);
+			if (wait_res < 0)
+				dev_err(&spi->dev, "TXFFE timed out\n");
+		} else {
+			wait_res = mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_TXS);
+			if (wait_res < 0)
+				dev_err(&spi->dev, "TXS timed out\n");
 		}
+		if (wait_res >= 0 && (mcspi_wait_for_reg_bit(chstat_reg,
+							     OMAP2_MCSPI_CHSTAT_EOT) < 0))
+			dev_err(&spi->dev, "EOT timed out\n");
 	}
+
 	return count;
 }
 
@@ -1010,9 +945,6 @@  static int omap2_mcspi_request_dma(struct omap2_mcspi *mcspi,
 		mcspi_dma->dma_rx = NULL;
 	}
 
-	init_completion(&mcspi_dma->dma_rx_completion);
-	init_completion(&mcspi_dma->dma_tx_completion);
-
 no_dma:
 	return ret;
 }
@@ -1102,8 +1034,10 @@  static irqreturn_t omap2_mcspi_irq_handler(int irq, void *data)
 
 	/* Disable IRQ and wakeup slave xfer task */
 	mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQENABLE, 0);
-	if (irqstat & OMAP2_MCSPI_IRQSTATUS_EOW)
-		complete(&mcspi->txdone);
+	if (irqstat & OMAP2_MCSPI_IRQSTATUS_EOW) {
+		complete_all(&mcspi->txrxdone);
+		mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQSTATUS, OMAP2_MCSPI_IRQSTATUS_EOW);
+	}
 
 	return IRQ_HANDLED;
 }
@@ -1111,12 +1045,9 @@  static irqreturn_t omap2_mcspi_irq_handler(int irq, void *data)
 static int omap2_mcspi_slave_abort(struct spi_master *master)
 {
 	struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
-	struct omap2_mcspi_dma *mcspi_dma = mcspi->dma_channels;
 
 	mcspi->slave_aborted = true;
-	complete(&mcspi_dma->dma_rx_completion);
-	complete(&mcspi_dma->dma_tx_completion);
-	complete(&mcspi->txdone);
+	complete_all(&mcspi->txrxdone);
 
 	return 0;
 }
@@ -1516,7 +1447,7 @@  static int omap2_mcspi_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "no irq resource found\n");
 		goto free_master;
 	}
-	init_completion(&mcspi->txdone);
+	init_completion(&mcspi->txrxdone);
 	status = devm_request_irq(&pdev->dev, status,
 				  omap2_mcspi_irq_handler, 0, pdev->name,
 				  mcspi);