diff options
| author | Simon Glass <sjg@chromium.org> | 2016-01-21 19:44:03 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2016-01-21 20:42:35 -0700 |
| commit | 28a943c11018f7e2946f3a529de87102f268cedb (patch) | |
| tree | db57df246af2bfaec66e3d92ca62c593fade6a35 /drivers | |
| parent | a49dc0a91456dda9baec7e4778de4d96fa9174ec (diff) | |
| download | u-boot-imx-28a943c11018f7e2946f3a529de87102f268cedb.zip u-boot-imx-28a943c11018f7e2946f3a529de87102f268cedb.tar.gz u-boot-imx-28a943c11018f7e2946f3a529de87102f268cedb.tar.bz2 | |
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 <sjg@chromium.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/rk_spi.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/spi/rk_spi.c b/drivers/spi/rk_spi.c index 2b58393..aaf139d 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; |