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| author | Michael Welling <mwelling@ieee.org> | 2015-05-12 12:38:57 -0500 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-05-12 20:17:52 +0100 |
| commit | ddcad7e9068ebc6526728df1f34f1dde4b7dbbab (patch) | |
| tree | 08c54d9b8d9f5c3b1f2e2dedec8198d53245cc55 /drivers/spi | |
| parent | bc7f9bbc80bcc77745b3f54ec4e7103e3e142bb9 (diff) | |
| download | linux-ddcad7e9068ebc6526728df1f34f1dde4b7dbbab.tar.gz linux-ddcad7e9068ebc6526728df1f34f1dde4b7dbbab.tar.bz2 linux-ddcad7e9068ebc6526728df1f34f1dde4b7dbbab.zip | |
spi: omap2-mcspi: Fix native cs with new set_cs
GPIO chip select patch series appears to have broken the native chip select
support. This patch pulls the manual native chip select toggling out of
the transfer_one routine and adds a set_cs routine.
Tested natively on AM3354 with SPI serial flash on spi0cs0.
Reported-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Michael Welling <mwelling@ieee.org>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-omap2-mcspi.c | 33 |
1 files changed, 11 insertions, 22 deletions
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c index 90cf7e775f15..a7d85c5ab2fa 100644 --- a/drivers/spi/spi-omap2-mcspi.c +++ b/drivers/spi/spi-omap2-mcspi.c @@ -243,17 +243,20 @@ static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable) mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0); } -static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active) +static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable) { u32 l; - l = mcspi_cached_chconf0(spi); - if (cs_active) - l |= OMAP2_MCSPI_CHCONF_FORCE; - else - l &= ~OMAP2_MCSPI_CHCONF_FORCE; + if (spi->controller_state) { + l = mcspi_cached_chconf0(spi); - mcspi_write_chconf0(spi, l); + if (enable) + l &= ~OMAP2_MCSPI_CHCONF_FORCE; + else + l |= OMAP2_MCSPI_CHCONF_FORCE; + + mcspi_write_chconf0(spi, l); + } } static void omap2_mcspi_set_master_mode(struct spi_master *master) @@ -1075,7 +1078,6 @@ static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi, struct spi_master *master; struct omap2_mcspi_dma *mcspi_dma; - int cs_active = 0; struct omap2_mcspi_cs *cs; struct omap2_mcspi_device_config *cd; int par_override = 0; @@ -1118,11 +1120,6 @@ static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi, mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL); } - if (!cs_active) { - omap2_mcspi_force_cs(spi, 1); - cs_active = 1; - } - chconf = mcspi_cached_chconf0(spi); chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; chconf &= ~OMAP2_MCSPI_CHCONF_TURBO; @@ -1169,12 +1166,6 @@ static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi, if (t->delay_usecs) udelay(t->delay_usecs); - /* ignore the "leave it on after last xfer" hint */ - if (t->cs_change) { - omap2_mcspi_force_cs(spi, 0); - cs_active = 0; - } - omap2_mcspi_set_enable(spi, 0); if (mcspi->fifo_depth > 0) @@ -1187,9 +1178,6 @@ out: status = omap2_mcspi_setup_transfer(spi, NULL); } - if (cs_active) - omap2_mcspi_force_cs(spi, 0); - if (cd && cd->cs_per_word) { chconf = mcspi->ctx.modulctrl; chconf |= OMAP2_MCSPI_MODULCTRL_SINGLE; @@ -1334,6 +1322,7 @@ static int omap2_mcspi_probe(struct platform_device *pdev) master->setup = omap2_mcspi_setup; master->auto_runtime_pm = true; master->transfer_one = omap2_mcspi_transfer_one; + master->set_cs = omap2_mcspi_set_cs; master->cleanup = omap2_mcspi_cleanup; master->dev.of_node = node; master->max_speed_hz = OMAP2_MCSPI_MAX_FREQ; |