In the TX_ONLY transfer, the SPI controller also receives data
simultaneously and saves them in the rx register. After the TX_ONLY
transfer, the rx register will hold the random data received during
the last tx transaction.
If the direct following transfer is RX_ONLY, this random data has the
possibility to affect this transfer like this:
When the SPI controller is changed from TX_ONLY to RX_ONLY,
the random data makes the rx register full immediately and
triggers a dummy write automatically(in SPI RX_ONLY transfers,
we need a dummy write to trigger the first transaction).
So the first data received in the RX_ONLY transfer will be that
random data instead of something meaningful.
We can avoid this by inserting a Disable/Re-enable toggle of the
channel after the TX_ONLY transfer, since it purges the rx register.
Signed-off-by: Jason Wang <jason77.w...@gmail.com>
Tested-by: Grazvydas Ignotas <nota...@gmail.com>
Acked-by: Tony Lindgren <t...@atomide.com>
---
Hi Grant,
The touchpanel driver can't work correctly on the omap3evm platform,
This is due to a omap2_mcspi driver issue, now fix it.
drivers/spi/omap2_mcspi.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index b3a94ca..43fab41 100644
--- a/drivers/spi/omap2_mcspi.c
+++ b/drivers/spi/omap2_mcspi.c
@@ -644,6 +644,12 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct
spi_transfer *xfer)
} else if (mcspi_wait_for_reg_bit(chstat_reg,
OMAP2_MCSPI_CHSTAT_EOT) < 0)
dev_err(&spi->dev, "EOT timed out\n");
+
+ /* disable chan to purge rx datas received in TX_ONLY transfer,
+ * otherwise these rx datas will affect the direct following
+ * RX_ONLY transfer.
+ */
+ omap2_mcspi_set_enable(spi, 0);
}
out:
omap2_mcspi_set_enable(spi, 1);
--
1.5.6.5
------------------------------------------------------------------------------
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