Commit Graph

114 Commits

Author SHA1 Message Date
Alexandru Ardelean
e74dc5c763
spi: use new spi_transfer_delay_exec helper where straightforward
For many places in the spi drivers, using the new `spi_transfer_delay`
helper is straightforward.
It's just replacing:
```
  if (t->delay_usecs)
     udelay(t->delay_usecs);
```
with `spi_transfer_delay(t)` which handles both `delay_usecs` and the new
`delay` field.

This change replaces in all places (in the spi drivers)  where this change
is simple.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20190926105147.7839-10-alexandru.ardelean@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-10-15 11:51:57 +01:00
Alexandru Ardelean
3984d39b0e
spi: spi-fsl-espi: convert transfer delay to spi_delay format
The way the max delay is computed for this controller, it looks like it is
searching for the max delay from an SPI message a using that.

No idea if this is valid. But this change should support both `delay_usecs`
and the new `delay` data which is of `spi_delay` type.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20190926105147.7839-17-alexandru.ardelean@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-10-15 11:46:34 +01:00
Thomas Gleixner
2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00
Geert Uytterhoeven
7c5d8a249a
spi: Do not print a message if spi_controller_{suspend,resume}() fails
spi_controller_{suspend,resume}() already prints an error message on
failure, so there is no need to repeat this in individual drivers.

Note: spi_master_{suspend,resume}() is an alias for
      spi_controller_{suspend,resume}().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Daniel Mack <daniel@zonque.org>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2018-09-05 12:38:27 +01:00
Tiago Brusamarello
516ddd7906
spi: spi-fsl-espi: Log fifo counters on error
Log RX and TX fifo counters when a transfer is done and these are not
zero.

Signed-off-by: Tiago Brusamarello <tiago.brusamarello@datacom.ind.br>
Signed-off-by: Mark Brown <broonie@kernel.org>
2018-07-26 15:43:09 +01:00
Heiner Kallweit
7e2ef00330 spi: fsl-espi: fix ioread16/iowrite16 endianness
fsl_espi_read_reg16 / fsl_espi_write_reg16 are supposed to read / write
big endian values. Therefore ioread16be / iowrite16be have to be used.

Fixes: 	0582343284 ("eliminate need for linearization when writing to hardware")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-12-01 18:50:59 +00:00
Heiner Kallweit
d54ef0574a spi: fsl-espi: remove unused linearization code
After introducing direct transfers between hardware and transfer
buffers remove all code which is unused now.

This includes getting rid of the 64k linearization buffer.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-30 18:05:21 +00:00
Heiner Kallweit
dcb425f3ba spi: fsl-espi: eliminate need for linearization when reading from hardware
Eliminate need for linearization when reading from the hardware and
write to the transfer buffers directly.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-30 18:05:14 +00:00
Heiner Kallweit
0582343284 spi: fsl-espi: eliminate need for linearization when writing to hardware
Eliminate need for linearization when writing to the hardware and
read from the transfer buffers directly.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-30 18:04:24 +00:00
Heiner Kallweit
e1cdee73df spi: fsl-espi: determine need for byte swap only once
Determine need for byte swap only once and store it in new member
swab in struct fsl_espi.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-30 18:04:23 +00:00
Heiner Kallweit
f254e65ce2 spi: fsl-espi: set spi_master members min_speed_hz and max_speed_hz
ESPI has a max and min supported SPI frequency, determined by the
clock divider range. Set master->min_speed_hz/max_speed_hz to inform
the SPI core about these limits.
Then the SPI core handles cases where a transfer requests a frequency
outside the supported range.

So far the driver simply set the lowest supported frequency if the
requested frequency was below the supported range. This is not
necessarily an appropriate action as the device might not support
frequencies greater than the requested one.
With this patch the SPI core will reject transfers requesting a
too low frequency.

The check in fsl_espi_setup can be removed because the SPI core sets
spi->max_speed_hz to master->max_speed_hz if it's not set already.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-16 14:59:39 +00:00
Heiner Kallweit
a9a813ddc5 spi: fsl-espi: simplify of_fsl_espi_suspend
Simplify of_fsl_espi_suspend a little.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-16 14:59:38 +00:00
Heiner Kallweit
278c48d2ab spi: fsl-espi: separate fsl-espi from fsl-lib completely
After having removed all code dependencies we can make fsl-espi
completely independent of fsl-lib now.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:48 +00:00
Heiner Kallweit
35ab046b52 spi: fsl-espi: introduce struct fsl_espi
Only few members of struct mpc8xxx_spi are relevant for fsl-espi.
Therefore replace it with a ESPI-specific struct fsl_espi.
Replace variable names mpc8xxx_spi and mspi with espi.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:47 +00:00
Heiner Kallweit
456c742be6 spi: fsl-espi: factor out fsl_espi_init_regs
The register initialization is the same in fsl_espi_probe and in
of_fsl_espi_resume. Therefore factor it out into fsl_espi_init_regs.

It was actually a bug that CSMODE_BEF and CSMODE_AFT were not set
in of_fsl_espi_resume. Seems like nobody ever used values other
than zero for these parameters.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:28 +00:00
Heiner Kallweit
219b5e3b23 spi: fsl-espi: introduce struct fsl_espi_cs
Very little from struct spi_mpc8xxx_cs is relevant for fsl-espi.
Therefore replace it with struct fsl_espi_cs.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:28 +00:00
Heiner Kallweit
7cb5557723 spi: fsl-espi: migrate relevant parts of mpc8xxx_spi_probe and of_mpc8xxx_spi_probe
Very little of the library functions mpc8xxx_spi_probe and
of_mpc8xxx_spi_probe is relevant for fsl-espi.

Therefore migrate the relevant parts to fsl-espi (considering
that get_brgfreq() always returns -1 on systems with ESPI)
and remove use of these functions.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:27 +00:00
Heiner Kallweit
cdb2f77cf5 spi: fsl-espi: remove usage of mpc8xxx_spi->irq
There's no need to access mpc8xxx_spi->irq, we can use function
parameter irq directly.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:27 +00:00
Heiner Kallweit
e3ce4f44f6 spi: fsl-espi: remove usage of mpc8xxx_spi->flags
Change the check to access property "mode" directly.
This allows us to get rid of mpc8xxx_spi->flags in a subsequent
patch in this patch series as it's used nowhere else.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:26 +00:00
Heiner Kallweit
7454346b0c spi: fsl-espi: remove remaining usage of struct fsl_spi_platform_data
Use master->num_chipselect directly instead of pdata->max_chipselect.
In this context let of_fsl_espi_get_chipselects return max_chipselect.

This change allows us to get rid of struct fsl_spi_platform_data
completely in the fsl-espi driver.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:25 +00:00
Heiner Kallweit
2808f778de spi: fsl-espi: don't set pdata->cs_control
Don't set pdata->cs_control as it's nowhere used in fsl-espi and fsl-lib.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 11:21:25 +00:00
Heiner Kallweit
689d41fbd4 spi: fsl-espi: remove usage of pdata->initial_spmode
Remove pdata->initial_spmode as it is nowhere set.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-14 10:50:13 +00:00
Heiner Kallweit
8263cb33c8 spi: fsl-espi: add support for dual output read mode
This patch adds support for dual output read mode.

It was successfully tested on a P1014-based device with S25FL128S
SPINOR flash. With 50MHz SPI clock the read rate is 11MByte/s.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-11 16:00:01 +00:00
Heiner Kallweit
aca75157d9 spi: fsl-espi: add support for ESPI RXSKIP mode
This patch adds support for ESPI RXSKIP mode. This mode is optimized
for flash reads:
- sends a number of bytes and then reads a number of bytes
- shifts out zeros automatically when reading

Supporting RXSKIP mode is a prerequisite for supporting dual output
read mode.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-11 16:00:00 +00:00
Heiner Kallweit
8f3086d2a9 spi: fsl-espi: don't write ESPI_SPMODE register if the mode doesn't change
There's no need to bother the chip if the mode doesn't change.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-04 14:46:39 -06:00
Heiner Kallweit
60d9531a61 spi: fsl-espi: remove unneeded call to fsl_espi_setup_transfer
Resetting the chip to a default transfer mode after each transfer
doesn't provide any benefit. Therefore remove this call.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-04 14:46:39 -06:00
Paulo Zaneti
73aaf15849 spi: fsl-espi: fix support for all available clock rates
According to NXP ESPI datasheet, the SPI clock rate is:

    spi_clk = System_Clock / ( 2 * DIV16 * ( 1 + PM ) )

Where System_Clock is the platform clock divided by 2,
DIV16 may be 1 or 16, and PM is a 4 bits integer (0 to 15).

Isolating PM on the expression, we get:

    PM = (System_Clock / ( 2 * DIV16 * spi_clk ) ) - 1

Where System_Clock = mpc8xxx_spi->spibrg / 2, spi_clk = hz,
and DIV16 = 1 or DIV16 = 16. So,

    PM = (mpc8xxx_spi->spibrg / ( 4 * hz) ) - 1
or
    PM = (mpc8xxx_spi->spibrg / ( 16 * 4 * hz) ) - 1

Current spi-fsl-espi driver can't configure the HW for all
supported clock rates. It filters out clock rates for PM = 0
and PM = 1.

This patch allows all range of supported clock rates to be
configured on the ESPI controller.

Signed-off-by: Paulo Zaneti <paulo.zaneti@datacom.ind.br>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-29 12:00:19 -06:00
Heiner Kallweit
66b8053e24 spi: fsl-espi: small fix to error path in fsl_espi_irq
spin_lock is used to obtain the spinlock, so spin_unlock
has to be used here.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-29 11:58:51 -06:00
Heiner Kallweit
f05689a662 spi: fsl-espi: fix and improve reading from RX FIFO
Currently the driver polls in the ISR for enough bytes in the RX FIFO.
An ISR should never do this.
Change it to read as much as possible whenever the ISR is called.
This also allows to significantly simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 19:39:47 +01:00
Heiner Kallweit
e508cea45b spi: fsl-espi: make better use of the RX FIFO
So far an interrupt is triggered whenever there's at least one byte
in the RX FIFO. This results in a unnecessarily high number of
interrupts.
Change this to generate an interrupt if
- RX FIFO is half full (except if all bytes to read fit into the
  RX FIFO anyway)
- end of transfer has been reached

This way the number of interrupts can be significantly reduced.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 19:39:47 +01:00
Heiner Kallweit
db1b049fad spi: fsl-espi: extend and improve transfer error handling
Extend and improve transfer error handling
- in case of timeout report also number of remaining rx bytes
- in case of timeout return ETIMEDOUT instead of EMSGSIZE
- add sanity checks after all bytes have been sent / read:
 - check that HW has flag SPIE_DON set
 - check that RX / TX FIFO are empty

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 19:39:46 +01:00
Heiner Kallweit
b3bec5f95f spi: fsl-espi: simplify and inline function fsl_espi_change_mode
The ESPI spec mentions no requirement to turn off the ESPI unit prior
to changing the mode. Most likely the ESPI unit is only turned off to
clear the FIFO's as before this patch series single bytes could
remain in the TX FIFO after transfer end.
Therefore remove disabling / re-enabling the ESPI unit.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 19:39:24 +01:00
Heiner Kallweit
f895e27f59 spi: fsl-espi: Rename len in struct mpc8xxx_spi to rx_len and make it unsigned
Now that we introduced element tx_len in struct mpc8xxx_spi let's
rename element len to rx_len as it actually is the number of bytes to
receive. In addition make it unsigned.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 19:39:23 +01:00
Heiner Kallweit
5473126596 spi: fsl-espi: fix and improve writing to TX FIFO
This change addresses two issues:
- If the TX FIFO is full the ISR polls until there's free space again.
  An ISR should never wait for something.
- Currently the number of bytes to transfer is rounded up to the next
  multiple of 4. For most transfers therefore few bytes remain in the
  TX FIFO after end of transfer.
  This would cause the next transfer to fail and as a workaround the
  ESPI block is disabled / re-enabled in fsl_espi_change_mode.
  This seems to clear the FIFO's (although it's not mentioned in the
  spec).

With this change the TX FIFO is filled as much as possible initially
and whenever the ISR is called. Also the exact number of bytes is
transferred.
The spinlock protects against a potential race if the first interrupt
occurs whilst the TX FIFO is still being initially filled.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 19:39:23 +01:00
Heiner Kallweit
e9e128a69a spi: fsl-espi: improve check for SPI_QE_CPU_MODE
SPI_QE_CPU_MODE doesn't exist for ESPI and is set by of_mpc8xxx_spi_probe
based on DT property "mode". This property is not defined for ESPI,
see Documentation/devicetree/bindings/spi/fsl-spi.txt.
So print an error message and bail out if SPI_QE_CPU_MODE is set.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 19:39:09 +01:00
Heiner Kallweit
e3cd6cf425 spi: fsl-espi: fix merge conflict for commit "avoid processing uninitalized data on error"
Commit 5c0ba57744 ("spi: fsl-espi: avoid processing uninitalized
data on error") applied fine to stable but caused a merge conflict
on next. This patch fixes that.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 18:56:17 +01:00
Mark Brown
f9ce28f923 Merge branch 'fix/fsl-espi' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-fsl-espi 2016-10-26 11:30:11 +01:00
Arnd Bergmann
5c0ba57744 spi: fsl-espi: avoid processing uninitalized data on error
When we get a spurious interrupt in fsl_espi_irq, we end up
processing four uninitalized bytes of data, as shown in this
warning message:

   drivers/spi/spi-fsl-espi.c: In function 'fsl_espi_irq':
   drivers/spi/spi-fsl-espi.c:462:4: warning: 'rx_data' may be used uninitialized in this function [-Wmaybe-uninitialized]

This adds another check so we skip the data in this case.

Fixes: 6319a68011 ("spi/fsl-espi: avoid infinite loops on fsl_espi_cpu_irq()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
2016-10-26 11:14:52 +01:00
Heiner Kallweit
923ab15e1a spi: fsl-espi: fix handling of word sizes other than 8 bit
The code in fsl_espi_tx_buf_lsb and parts of fsl_espi_setup_transfer
look very weird and don't reflect the ESPI spec.
ESPI stores values with <= 8 bit word size right justified as 8 bit
value and values with > 8 bit word size right justified as 16 bit
value. Therefore no such shifting is needed.
Only case MSB-first with 8 bit word size is correctly handled,
and most likely nobody ever used this driver with a different config.

On ESPI only the case LSB-first with word size > 8 bit needs a
special handling. In this case a little endian 16 bit value has
to be written to the TX FIFO what requires a byte swap as the
host system is big endian.
The same applies to reading from the RX FIFO.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-21 12:09:37 +01:00
Heiner Kallweit
e4be7053b9 spi: fsl-espi: reject MSB-first transfers with word sizes other than 8 or 16
According to the ESPI spec MSB-first transfers are supported for
word size 8 and 16 only.

Check for this and reject MSB-first transfers with other word sizes.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-21 12:09:37 +01:00
Heiner Kallweit
b497eb0245 spi: fsl-espi: replace of_get_property with of_property_read_u32
of_property_read_u32 is better here than generic of_get_property:
- implicit endianness conversion if needed
- implicit checking of size of property

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-21 12:09:37 +01:00
Heiner Kallweit
604042af76 spi: fsl-espi: improve return value handling in fsl_espi_probe
The return value of fsl_espi_probe (currently struct spi_master *)
is just used for checking whether an error occurred.
Change the return value type to int and simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-24 19:48:32 +01:00
Heiner Kallweit
acf692190f spi: fsl-espi: simplify of_fsl_espi_probe
Simplify of_fsl_espi_probe.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-24 19:48:31 +01:00
Heiner Kallweit
fb8ac912df spi: fsl-espi: remove unused variable in fsl_espi_setup
Remove an unused variable.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-24 19:47:07 +01:00
Heiner Kallweit
81abc2ecac spi: fsl-espi: improve and extend register bit definitions
Add definition of further register bits for use in upcoming
driver extensions and improve current bit definitions:
- use BIT macro
- use bit names as in the chip spec

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14 18:24:48 +01:00
Heiner Kallweit
46afd38b7d spi: fsl-espi: align register access with other drivers
Change register access to the method used in other drivers too.
- use register names as in the chip spec for constants
- avoid hard to read statements like
  __be32 __iomem *espi_mode = &reg_base->mode
- get rid of old powerpc-specific functions like in_8

In addition annotate reg_base in struct mpc8xxx_spi as __iomem.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14 18:24:47 +01:00
Heiner Kallweit
35f5d71e38 spi: fsl-espi: improve and simplify interrupt handler
Simplify the interrupt handler a little. In addition don't call
fsl_espi_cpu_irq() if no event bit is set.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14 18:24:47 +01:00
Heiner Kallweit
d198ebfb75 spi: fsl-espi: simplify fsl_espi_setup_transfer
If t is not null then the SPI core takes care that bits_per_word and
speed_hz are populated. This allows to simplify fsl_espi_setup_transfer.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14 18:24:46 +01:00
Heiner Kallweit
38d003f1a4 spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_trans
Merge both functions to reduce source code size and improve
readability.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12 20:03:50 +01:00
Heiner Kallweit
06af115d6c spi: fsl-espi: improve message length handling
Move checking for a zero-length message up in the call chain and
use m->frame_length instead of re-calculating the overall length
of all transfers in the message.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12 20:03:49 +01:00