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i2c: rcar: refactor and shorten timeout when resetting

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LOOP_TIMEOUT was only used back then because we didn't want to introduce
another constant. The timeout value can easily be a magnitude shorter
because the typical range is 3us - 8us. Refactor the code to use the
poll_timeout helper, use a specific timeout value and get rid of the
ugly LOOP_TIMEOUT constant.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Wolfram Sang 2020-08-29 22:38:10 +02:00 committed by Wolfram Sang
parent 9374ed1dfe
commit 74779f6eeb
1 changed files with 3 additions and 12 deletions
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15
drivers/i2c/busses/i2c-rcar.c
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@ -146,9 +146,6 @@ struct rcar_i2c_priv {
#define rcar_i2c_priv_to_dev(p) ((p)->adap.dev.parent)
#define rcar_i2c_is_recv(p) ((p)->msg->flags & I2C_M_RD)
#define LOOP_TIMEOUT 1024
static void rcar_i2c_write(struct rcar_i2c_priv *priv, int reg, u32 val)
{
writel(val, priv->io + reg);
@ -760,20 +757,14 @@ static void rcar_i2c_release_dma(struct rcar_i2c_priv *priv)
/* I2C is a special case, we need to poll the status of a reset */
static int rcar_i2c_do_reset(struct rcar_i2c_priv *priv)
{
int i, ret;
int ret;
ret = reset_control_reset(priv->rstc);
if (ret)
return ret;
for (i = 0; i < LOOP_TIMEOUT; i++) {
ret = reset_control_status(priv->rstc);
if (ret == 0)
return 0;
udelay(1);
}
return -ETIMEDOUT;
return read_poll_timeout_atomic(reset_control_status, ret, ret == 0, 1,
100, false, priv->rstc);
}
static int rcar_i2c_master_xfer(struct i2c_adapter *adap,