From 28a943c11018f7e2946f3a529de87102f268cedb Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 21 Jan 2016 19:44:03 -0700 Subject: [PATCH] rockchip: spi: Remember the last speed to avoid re-setting it 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 --- drivers/spi/rk_spi.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/spi/rk_spi.c b/drivers/spi/rk_spi.c index 2b58393e35..aaf139d823 100644 --- a/drivers/spi/rk_spi.c +++ b/drivers/spi/rk_spi.c @@ -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; -- 2.39.5