diff options
| author | Vignesh Raghavendra <vigneshr@ti.com> | 2020-11-29 10:23:05 +0300 |
|---|---|---|
| committer | Lokesh Vutla <lokeshvutla@ti.com> | 2021-01-12 07:51:41 +0300 |
| commit | f3f83ad4caf4f4fb2394d70585a20ce56b552c5e (patch) | |
| tree | a65f08243fd14a0132289e2fed9926ce1bbecc88 /drivers/spi | |
| parent | 705082d4b1a2040c9f1ff2a7d5c4f2fccafde4bc (diff) | |
| download | u-boot-f3f83ad4caf4f4fb2394d70585a20ce56b552c5e.tar.xz | |
spi: omap3_spi: Fix speed and mode selection
McSPI IP provides per CS specific speed and mode selection. Therefore it
is possible to apply these settings only after CS is known. But
set_speed and set_mode can be called without bus being claimed, this
would lead driver to set up wrong CS (or previously used CS).
Fix this by apply set_speed and set_mode only if bus is already claimed.
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Tested-by: Miquel Raynal <miquel.raynal@bootlin.com>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/omap3_spi.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/spi/omap3_spi.c b/drivers/spi/omap3_spi.c index 78e2a25cdb..74931768c0 100644 --- a/drivers/spi/omap3_spi.c +++ b/drivers/spi/omap3_spi.c @@ -37,6 +37,8 @@ struct omap3_spi_priv { unsigned int mode; unsigned int wordlen; unsigned int pin_dir:1; + + bool bus_claimed; }; static void omap3_spi_write_chconf(struct omap3_spi_priv *priv, int val) @@ -372,6 +374,8 @@ static void _omap3_spi_claim_bus(struct omap3_spi_priv *priv) conf |= OMAP3_MCSPI_MODULCTRL_SINGLE; writel(conf, &priv->regs->modulctrl); + + priv->bus_claimed = true; } static int omap3_spi_claim_bus(struct udevice *dev) @@ -381,9 +385,12 @@ static int omap3_spi_claim_bus(struct udevice *dev) struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev); priv->cs = slave_plat->cs; - priv->freq = slave_plat->max_hz; + if (!priv->freq) + priv->freq = slave_plat->max_hz; _omap3_spi_claim_bus(priv); + _omap3_spi_set_speed(priv); + _omap3_spi_set_mode(priv); return 0; } @@ -395,6 +402,8 @@ static int omap3_spi_release_bus(struct udevice *dev) writel(OMAP3_MCSPI_MODULCTRL_MS, &priv->regs->modulctrl); + priv->bus_claimed = false; + return 0; } @@ -440,7 +449,8 @@ static int omap3_spi_set_speed(struct udevice *dev, unsigned int speed) struct omap3_spi_priv *priv = dev_get_priv(dev); priv->freq = speed; - _omap3_spi_set_speed(priv); + if (priv->bus_claimed) + _omap3_spi_set_speed(priv); return 0; } @@ -451,7 +461,8 @@ static int omap3_spi_set_mode(struct udevice *dev, uint mode) priv->mode = mode; - _omap3_spi_set_mode(priv); + if (priv->bus_claimed) + _omap3_spi_set_mode(priv); return 0; } |