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spi: Fix for v6.2 

One driver specific change here which handles the case where a SPI
 device for some reason tries to change the bus speed during a message on
 fsl_spi hardware, this should be very unusual.
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Merge tag 'spi-fix-v6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi fix from Mark Brown:
 "One driver specific change here which handles the case where a SPI
  device for some reason tries to change the bus speed during a message
  on fsl_spi hardware, this should be very unusual"

* tag 'spi-fix-v6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: fsl_spi: Don't change speed while chipselect is active
This commit is contained in:
Linus Torvalds 2022-12-23 14:44:08 -08:00
parent 0a023cbb11 3b553e0041
commit 72a85e2b0a
1 changed files with 16 additions and 3 deletions
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19
drivers/spi/spi-fsl-spi.c
View File

@ -333,13 +333,26 @@ static int fsl_spi_prepare_message(struct spi_controller *ctlr,
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(ctlr);
struct spi_transfer *t;
struct spi_transfer *first;
first = list_first_entry(&m->transfers, struct spi_transfer,
transfer_list);
/*
* In CPU mode, optimize large byte transfers to use larger
* bits_per_word values to reduce number of interrupts taken.
*
* Some glitches can appear on the SPI clock when the mode changes.
* Check that there is no speed change during the transfer and set it up
* now to change the mode without having a chip-select asserted.
*/
if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) {
list_for_each_entry(t, &m->transfers, transfer_list) {
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->speed_hz != first->speed_hz) {
dev_err(&m->spi->dev,
"speed_hz cannot change during message.\n");
return -EINVAL;
}
if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) {
if (t->len < 256 || t->bits_per_word != 8)
continue;
if ((t->len & 3) == 0)
@ -348,7 +361,7 @@ static int fsl_spi_prepare_message(struct spi_controller *ctlr,
t->bits_per_word = 16;
}
}
return 0;
return fsl_spi_setup_transfer(m->spi, first);
}
static int fsl_spi_transfer_one(struct spi_controller *controller,