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rockchip: spi: Remember the last speed to avoid re-setting it

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Rather than changing the clock to the same value on every transaction,
remember the last value and don't adjust the clock unless it is necessary.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-01-21 19:44:03 -07:00
parent a49dc0a914
commit 28a943c110
1 changed files with 4 additions and 1 deletions
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5
drivers/spi/rk_spi.c
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@ -44,6 +44,7 @@ struct rockchip_spi_priv {
u8 bits_per_word; /* max 16 bits per word */
u8 n_bytes;
unsigned int speed_hz;
unsigned int last_speed_hz;
unsigned int tmode;
uint input_rate;
};
@ -82,6 +83,7 @@ static void rkspi_set_clk(struct rockchip_spi_priv *priv, uint speed)
debug("spi speed %u, div %u\n", speed, clk_div);
writel(clk_div, &priv->regs->baudr);
priv->last_speed_hz = speed;
}
static int rkspi_wait_till_not_busy(struct rockchip_spi *regs)
@ -212,7 +214,8 @@ static int rockchip_spi_claim_bus(struct udevice *dev)
return -EPROTONOSUPPORT;
}
rkspi_set_clk(priv, priv->speed_hz);
if (priv->speed_hz != priv->last_speed_hz)
rkspi_set_clk(priv, priv->speed_hz);
/* Operation Mode */
ctrlr0 = OMOD_MASTER << OMOD_SHIFT;