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spi: omap3_spi: Fix speed and mode selection

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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>
This commit is contained in:
Vignesh Raghavendra 2020-11-29 12:53:05 +05:30 • committed by Lokesh Vutla
parent 705082d4b1
commit f3f83ad4ca
1 changed files with 14 additions and 3 deletions
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11
drivers/spi/omap3_spi.c
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@ -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;
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;
}
@ -440,6 +449,7 @@ static int omap3_spi_set_speed(struct udevice *dev, unsigned int speed)
struct omap3_spi_priv *priv = dev_get_priv(dev);
priv->freq = speed;
if (priv->bus_claimed)
_omap3_spi_set_speed(priv);
return 0;
@ -451,6 +461,7 @@ static int omap3_spi_set_mode(struct udevice *dev, uint mode)
priv->mode = mode;
if (priv->bus_claimed)
_omap3_spi_set_mode(priv);
return 0;