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.
Signed-off-by: Michael Welling <mwelling@xxxxxxxx>
---
drivers/spi/spi-omap2-mcspi.c | 33 +++++++++++----------------------
1 file changed, 11 insertions(+), 22 deletions(-)
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 90cf7e7..a7d85c5 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;
--
1.7.9.5
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