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drivers/spi/omap3: Bug fix of premature write transfer completion

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The logic determining SPI "write" transfer completion was faulty. At
certain conditions (e.g. slow SPI clock freq) the transfers were
interrupted before completion. Both EOT and TXS flags of channel
status registeer shall be checked to ensure that all data was
transferred. Tested on AM3359 chip.

Signed-off-by: Vasili Galka <vasili@visionmap.com>
This commit is contained in:
Vasili Galka 2014-03-09 15:56:52 +02:00 committed by Tom Rini
parent d73f38f7ba
commit ce6889a997
1 changed files with 3 additions and 2 deletions
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5
drivers/spi/omap3_spi.c
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@ -260,8 +260,9 @@ int omap3_spi_write(struct spi_slave *slave, unsigned int len, const void *txp,
}
/* wait to finish of transfer */
while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
OMAP3_MCSPI_CHSTAT_EOT));
while ((readl(&ds->regs->channel[ds->slave.cs].chstat) &
(OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)) !=
(OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS));
/* Disable the channel otherwise the next immediate RX will get affected */
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);