linux-toradex.git/drivers/spi/spi-xilinx.c, branch v4.2.7

spi/spi-xilinx: Fix mixed poll/irq mode

2015-09-21T17:10:57+00:00

commit 16ea9b8ac45bf11d48af6013283e141e8ed86348 upstream.

Once the module process a transfer in irq mode, the next poll transfer
will not work because the transmitter is left in inhibited state.

Fixes: 22417352f6b7f623 (Use polling mode on small transfers)
Reported-by: Edward Kigwana 
Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown 
Signed-off-by: Greg Kroah-Hartman

spi/spi-xilinx: Fix spurious IRQ ACK on irq mode

2015-09-21T17:10:56+00:00

commit 74346841e6f5df5f7b83d5904435d273c507dba6 upstream.

The ACK of an inexistent IRQ can trigger an spurious IRQ that breaks the
txrx logic. This has been observed on axi_quad_spi:3.2 core.

This patch only ACKs IRQs that have not been Acknowledge jet.

Reported-by: Edward Kigwana 
Tested-by: Edward Kigwana 
Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown 
Signed-off-by: Greg Kroah-Hartman

spi/xilinx: Fix access invalid memory on xilinx_spi_tx

2015-02-02T12:17:19+00:00

On 1 and 2 bytes per word, the transfer of the 3 last bytes will access
memory outside tx_ptr.

Although this has not trigger any error on real hardware, we should
better fix this.

Fixes: 24ba5e593f391507 (Remove rx_fn and tx_fn pointer)
Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown

spi: Revert "spi/xilinx: Remove iowrite/ioread wrappers"

2015-01-30T12:42:00+00:00

This reverts commit 99082eab63449f9dfa83d5157fa6d78bfc1b04d7 since it
breaks the build due to differing implementations of iowrite() and
ioread().

Signed-off-by: Mark Brown

spi/xilinx: Check number of slaves range

2015-01-28T19:57:32+00:00

The core only supports up to 32 slaves, and the chipselect function
expects the same.

Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown

spi/xilinx: Use polling mode on small transfers

2015-01-28T19:42:43+00:00

Small transfers generally can be accomplished faster in polling mode.
This patch select the transfer which size is bellow the buffer size to
be done on polling mode

Suggested-by: Mark Brown 
Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown

spi/xilinx: Remove remaining_words driver data variable

2015-01-28T19:42:43+00:00

The variable never leaves the scope of txrx_bufs.

Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown

spi/xilinx: Remove iowrite/ioread wrappers

2015-01-28T19:42:43+00:00

Save a stack level and cleanup code.

Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown

spi/xilinx: Convert bits_per_word in bytes_per_word

2015-01-28T19:42:43+00:00

Simplify the code by using the unit used on most of the code logic.

Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown

spi/xilinx: Convert remainding_bytes in remaining words

2015-01-28T19:42:43+00:00

Simplify the code by using the unit used on most of the code logic.

Signed-off-by: Ricardo Ribalda Delgado 
Signed-off-by: Mark Brown