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spi: spi-cadence: Fix data corruption issues in slave mode 

commit 627d05a41c upstream.

Remove 10us delay in cdns_spi_process_fifo() (called from cdns_spi_irq())
to fix data corruption issue on Master side when this driver
configured in Slave mode, as Slave is failed to prepare the date
on time due to above delay.

Add 10us delay before processing the RX FIFO as TX empty doesn't
guarantee valid data in RX FIFO.

Signed-off-by: Srinivas Goud <srinivas.goud@amd.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Tested-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/1692610216-217644-1-git-send-email-srinivas.goud@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Srinivas Goud 2023-08-21 15:00:16 +05:30 committed by Greg Kroah-Hartman
parent 28b605e939
commit 06a128cbe4
1 changed files with 12 additions and 7 deletions
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19
drivers/spi/spi-cadence.c
View File

@ -316,12 +316,6 @@ static void cdns_spi_process_fifo(struct cdns_spi *xspi, int ntx, int nrx)
xspi->rx_bytes -= nrx;
while (ntx || nrx) {
/* When xspi in busy condition, bytes may send failed,
* then spi control did't work thoroughly, add one byte delay
*/
if (cdns_spi_read(xspi, CDNS_SPI_ISR) & CDNS_SPI_IXR_TXFULL)
udelay(10);
if (ntx) {
if (xspi->txbuf)
cdns_spi_write(xspi, CDNS_SPI_TXD, *xspi->txbuf++);
@ -391,6 +385,11 @@ static irqreturn_t cdns_spi_irq(int irq, void *dev_id)
if (xspi->tx_bytes) {
cdns_spi_process_fifo(xspi, trans_cnt, trans_cnt);
} else {
/* Fixed delay due to controller limitation with
* RX_NEMPTY incorrect status
* Xilinx AR:65885 contains more details
*/
udelay(10);
cdns_spi_process_fifo(xspi, 0, trans_cnt);
cdns_spi_write(xspi, CDNS_SPI_IDR,
CDNS_SPI_IXR_DEFAULT);
@ -438,12 +437,18 @@ static int cdns_transfer_one(struct spi_controller *ctlr,
cdns_spi_setup_transfer(spi, transfer);
} else {
/* Set TX empty threshold to half of FIFO depth
* only if TX bytes are more than half FIFO depth.
* only if TX bytes are more than FIFO depth.
*/
if (xspi->tx_bytes > xspi->tx_fifo_depth)
cdns_spi_write(xspi, CDNS_SPI_THLD, xspi->tx_fifo_depth >> 1);
}
/* When xspi in busy condition, bytes may send failed,
* then spi control didn't work thoroughly, add one byte delay
*/
if (cdns_spi_read(xspi, CDNS_SPI_ISR) & CDNS_SPI_IXR_TXFULL)
udelay(10);
cdns_spi_process_fifo(xspi, xspi->tx_fifo_depth, 0);
spi_transfer_delay_exec(transfer);