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spi: sunxi: drop max_hz handling

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The driver is trying to read the "spi-max-frequency" property of the
*controller* driver node. There is no such property. The
"spi-max-frequency" property belongs to the SPI devices on the bus.

Right now, the driver will always fall back to the default value of 1MHz
and thus flash reads are very slow with just about 215kb/s.

In fact, the SPI uclass will already take care of everything and we just
have to clamp the frequency to the values the driver/hardware supports.
Thus, drop the whole max_hz handling.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Michael Walle
2024-07-12 19:14:56 +02:00
committed by Andre Przywara
parent a7766911bc
commit 674e4f994f
1 changed files with 9 additions and 12 deletions
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21
drivers/spi/spi-sunxi.c
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@@ -135,7 +135,6 @@ struct sun4i_spi_variant {
struct sun4i_spi_plat {
struct sun4i_spi_variant *variant;
u32 base;
u32 max_hz;
};
struct sun4i_spi_priv {
@@ -237,6 +236,13 @@ static void sun4i_spi_set_speed_mode(struct udevice *dev)
unsigned int div;
u32 reg;
/*
* The uclass should take care that this won't happen. But anyway,
* avoid a div-by-zero exception.
*/
if (!priv->freq)
return;
/*
* Setup clock divider.
*
@@ -401,11 +407,10 @@ static int sun4i_spi_xfer(struct udevice *dev, unsigned int bitlen,
static int sun4i_spi_set_speed(struct udevice *dev, uint speed)
{
struct sun4i_spi_plat *plat = dev_get_plat(dev);
struct sun4i_spi_priv *priv = dev_get_priv(dev);
if (speed > plat->max_hz)
speed = plat->max_hz;
if (speed > SUN4I_SPI_MAX_RATE)
speed = SUN4I_SPI_MAX_RATE;
if (speed < SUN4I_SPI_MIN_RATE)
speed = SUN4I_SPI_MIN_RATE;
@@ -458,7 +463,6 @@ static int sun4i_spi_probe(struct udevice *bus)
priv->variant = plat->variant;
priv->base = plat->base;
priv->freq = plat->max_hz;
return 0;
}
@@ -466,16 +470,9 @@ static int sun4i_spi_probe(struct udevice *bus)
static int sun4i_spi_of_to_plat(struct udevice *bus)
{
struct sun4i_spi_plat *plat = dev_get_plat(bus);
int node = dev_of_offset(bus);
plat->base = dev_read_addr(bus);
plat->variant = (struct sun4i_spi_variant *)dev_get_driver_data(bus);
plat->max_hz = fdtdec_get_int(gd->fdt_blob, node,
"spi-max-frequency",
SUN4I_SPI_DEFAULT_RATE);
if (plat->max_hz > SUN4I_SPI_MAX_RATE)
plat->max_hz = SUN4I_SPI_MAX_RATE;
return 0;
}