From: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> To: "Mark Brown" <broonie@kernel.org>, "Michal Simek" <michal.simek@xilinx.com>, "Sören Brinkmann" <soren.brinkmann@xilinx.com>, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Subject: [PATCH 09/18] spi/xilinx: Do not inhibit transmission in polling mode Date: Fri, 23 Jan 2015 17:08:41 +0100 [thread overview] Message-ID: <1422029330-10971-10-git-send-email-ricardo.ribalda@gmail.com> (raw) In-Reply-To: <1422029330-10971-1-git-send-email-ricardo.ribalda@gmail.com> When no irq is used, there is no need to inhibit the transmission for every transaction. This inhibition was implemented to avoid a race condition with the irq handler. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> --- drivers/spi/spi-xilinx.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c index 8a28cab..a70cb91 100644 --- a/drivers/spi/spi-xilinx.c +++ b/drivers/spi/spi-xilinx.c @@ -163,6 +163,7 @@ static void xspi_rx32(struct xilinx_spi *xspi) static void xspi_init_hw(struct xilinx_spi *xspi) { void __iomem *regs_base = xspi->regs; + u32 inhibit; /* Reset the SPI device */ xspi->write_fn(XIPIF_V123B_RESET_MASK, @@ -173,16 +174,19 @@ static void xspi_init_hw(struct xilinx_spi *xspi) xspi->write_fn(XSPI_INTR_TX_EMPTY, regs_base + XIPIF_V123B_IIER_OFFSET); /* Enable the global IPIF interrupt */ - if (xspi->irq >= 0) + if (xspi->irq >= 0) { xspi->write_fn(XIPIF_V123B_GINTR_ENABLE, regs_base + XIPIF_V123B_DGIER_OFFSET); - else + inhibit = XSPI_CR_TRANS_INHIBIT; + } else { xspi->write_fn(0, regs_base + XIPIF_V123B_DGIER_OFFSET); + inhibit = 0; + } /* Deselect the slave on the SPI bus */ xspi->write_fn(0xffff, regs_base + XSPI_SSR_OFFSET); /* Disable the transmitter, enable Manual Slave Select Assertion, * put SPI controller into master mode, and enable it */ - xspi->write_fn(XSPI_CR_TRANS_INHIBIT | XSPI_CR_MANUAL_SSELECT | + xspi->write_fn(inhibit | XSPI_CR_MANUAL_SSELECT | XSPI_CR_MASTER_MODE | XSPI_CR_ENABLE | XSPI_CR_TXFIFO_RESET | XSPI_CR_RXFIFO_RESET, regs_base + XSPI_CR_OFFSET); } @@ -252,7 +256,7 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) reinit_completion(&xspi->done); while (xspi->remaining_bytes) { - u16 cr; + u16 cr = 0; int n_words; n_words = (xspi->remaining_bytes * 8) / xspi->bits_per_word; @@ -263,13 +267,13 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) /* Start the transfer by not inhibiting the transmitter any * longer */ - cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET) & - ~XSPI_CR_TRANS_INHIBIT; - xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); - if (xspi->irq >= 0) + if (xspi->irq >= 0) { + cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET) & + ~XSPI_CR_TRANS_INHIBIT; + xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); wait_for_completion(&xspi->done); - else + } else while (!(xspi->read_fn(xspi->regs + XSPI_SR_OFFSET) & XSPI_SR_TX_EMPTY_MASK)) ; @@ -279,7 +283,8 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) * transmitter while the Isr refills the transmit register/FIFO, * or make sure it is stopped if we're done. */ - xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT, + if (xspi->irq >= 0) + xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT, xspi->regs + XSPI_CR_OFFSET); /* Read out all the data from the Rx FIFO */ -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: ricardo.ribalda@gmail.com (Ricardo Ribalda Delgado) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 09/18] spi/xilinx: Do not inhibit transmission in polling mode Date: Fri, 23 Jan 2015 17:08:41 +0100 [thread overview] Message-ID: <1422029330-10971-10-git-send-email-ricardo.ribalda@gmail.com> (raw) In-Reply-To: <1422029330-10971-1-git-send-email-ricardo.ribalda@gmail.com> When no irq is used, there is no need to inhibit the transmission for every transaction. This inhibition was implemented to avoid a race condition with the irq handler. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> --- drivers/spi/spi-xilinx.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c index 8a28cab..a70cb91 100644 --- a/drivers/spi/spi-xilinx.c +++ b/drivers/spi/spi-xilinx.c @@ -163,6 +163,7 @@ static void xspi_rx32(struct xilinx_spi *xspi) static void xspi_init_hw(struct xilinx_spi *xspi) { void __iomem *regs_base = xspi->regs; + u32 inhibit; /* Reset the SPI device */ xspi->write_fn(XIPIF_V123B_RESET_MASK, @@ -173,16 +174,19 @@ static void xspi_init_hw(struct xilinx_spi *xspi) xspi->write_fn(XSPI_INTR_TX_EMPTY, regs_base + XIPIF_V123B_IIER_OFFSET); /* Enable the global IPIF interrupt */ - if (xspi->irq >= 0) + if (xspi->irq >= 0) { xspi->write_fn(XIPIF_V123B_GINTR_ENABLE, regs_base + XIPIF_V123B_DGIER_OFFSET); - else + inhibit = XSPI_CR_TRANS_INHIBIT; + } else { xspi->write_fn(0, regs_base + XIPIF_V123B_DGIER_OFFSET); + inhibit = 0; + } /* Deselect the slave on the SPI bus */ xspi->write_fn(0xffff, regs_base + XSPI_SSR_OFFSET); /* Disable the transmitter, enable Manual Slave Select Assertion, * put SPI controller into master mode, and enable it */ - xspi->write_fn(XSPI_CR_TRANS_INHIBIT | XSPI_CR_MANUAL_SSELECT | + xspi->write_fn(inhibit | XSPI_CR_MANUAL_SSELECT | XSPI_CR_MASTER_MODE | XSPI_CR_ENABLE | XSPI_CR_TXFIFO_RESET | XSPI_CR_RXFIFO_RESET, regs_base + XSPI_CR_OFFSET); } @@ -252,7 +256,7 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) reinit_completion(&xspi->done); while (xspi->remaining_bytes) { - u16 cr; + u16 cr = 0; int n_words; n_words = (xspi->remaining_bytes * 8) / xspi->bits_per_word; @@ -263,13 +267,13 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) /* Start the transfer by not inhibiting the transmitter any * longer */ - cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET) & - ~XSPI_CR_TRANS_INHIBIT; - xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); - if (xspi->irq >= 0) + if (xspi->irq >= 0) { + cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET) & + ~XSPI_CR_TRANS_INHIBIT; + xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); wait_for_completion(&xspi->done); - else + } else while (!(xspi->read_fn(xspi->regs + XSPI_SR_OFFSET) & XSPI_SR_TX_EMPTY_MASK)) ; @@ -279,7 +283,8 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) * transmitter while the Isr refills the transmit register/FIFO, * or make sure it is stopped if we're done. */ - xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT, + if (xspi->irq >= 0) + xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT, xspi->regs + XSPI_CR_OFFSET); /* Read out all the data from the Rx FIFO */ -- 2.1.4
next prev parent reply other threads:[~2015-01-23 16:12 UTC|newest] Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-01-23 16:08 [PATCH 00/18] spi/xilinx: Speed-up Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 01/18] spi/xilinx: Support for spi mode LSB_FIRST Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-26 19:23 ` Mark Brown 2015-01-26 19:23 ` Mark Brown 2015-01-26 19:23 ` Mark Brown 2015-01-23 16:08 ` [PATCH 02/18] spi/xilinx: Support for spi mode LOOP Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-26 19:23 ` Mark Brown 2015-01-26 19:23 ` Mark Brown 2015-01-26 19:23 ` Mark Brown 2015-01-23 16:08 ` [PATCH 03/18] spi/xilinx: Simplify data read from the Rx FIFO Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-27 17:25 ` Mark Brown 2015-01-27 17:25 ` Mark Brown 2015-01-27 17:25 ` Mark Brown 2015-01-23 16:08 ` [PATCH 04/18] spi-xilinx: Simplify spi_fill_tx_fifo Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-26 23:54 ` Mark Brown 2015-01-26 23:54 ` Mark Brown 2015-01-23 16:08 ` [PATCH 05/18] spi/xilinx: Leave the IRQ always enabled Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 06/18] spi/xilinx: Code cleanup Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-27 0:05 ` Mark Brown 2015-01-27 0:05 ` Mark Brown 2015-01-27 0:05 ` Mark Brown 2015-01-23 16:08 ` [PATCH 07/18] spi/xilinx: Use cached value of register Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 08/18] spi/xilinx: Support cores with no interrupt Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-27 0:04 ` Mark Brown 2015-01-27 0:04 ` Mark Brown 2015-01-27 0:04 ` Mark Brown 2015-01-27 19:05 ` Ricardo Ribalda Delgado 2015-01-27 19:05 ` Ricardo Ribalda Delgado 2015-01-27 19:49 ` Mark Brown 2015-01-27 19:49 ` Mark Brown 2015-01-27 19:49 ` Mark Brown 2015-01-27 19:56 ` Ricardo Ribalda Delgado 2015-01-27 19:56 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado [this message] 2015-01-23 16:08 ` [PATCH 09/18] spi/xilinx: Do not inhibit transmission in polling mode Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 10/18] spi/xilinx: Support for spi mode CS_HIGH Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 11/18] spi/xilinx: Remove rx_fn and tx_fn pointer Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-27 0:09 ` Mark Brown 2015-01-27 0:09 ` Mark Brown 2015-01-27 0:09 ` Mark Brown 2015-01-27 10:00 ` Ricardo Ribalda Delgado 2015-01-27 10:00 ` Ricardo Ribalda Delgado 2015-01-27 10:00 ` Ricardo Ribalda Delgado 2015-01-27 15:42 ` Joe Perches 2015-01-27 15:42 ` Joe Perches 2015-01-27 15:42 ` Joe Perches 2015-01-27 19:07 ` Ricardo Ribalda Delgado 2015-01-27 19:07 ` Ricardo Ribalda Delgado 2015-01-27 19:07 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 12/18] spi/xilinx: Make spi_tx and spi_rx simmetric Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 13/18] spi/xilinx: Convert remainding_bytes in remaining words Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 14/18] spi/xilinx: Convert bits_per_word in bytes_per_word Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 15/18] spi/xilinx: Remove iowrite/ioread wrappers Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 16/18] spi/xilinx: Reset core before buffer_size detection Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-27 0:11 ` Mark Brown 2015-01-27 0:11 ` Mark Brown 2015-01-27 0:11 ` Mark Brown 2015-01-23 16:08 ` [PATCH 17/18] spi/xilinx: Remove remaining_words driver data variable Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-23 16:08 ` [PATCH 18/18] spi/xilinx: Check number of slaves range Ricardo Ribalda Delgado 2015-01-23 16:08 ` Ricardo Ribalda Delgado 2015-01-27 0:14 ` [PATCH 00/18] spi/xilinx: Speed-up Mark Brown 2015-01-27 0:14 ` Mark Brown 2015-01-27 0:14 ` Mark Brown 2015-01-27 10:17 ` Ricardo Ribalda Delgado 2015-01-27 10:17 ` Ricardo Ribalda Delgado 2015-01-27 11:59 ` Mark Brown 2015-01-27 11:59 ` Mark Brown 2015-01-27 11:59 ` Mark Brown
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