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i2c: designware_i2c: Add spike supression

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Some versions of this peripheral include a spike-suppression phase of the
bus. Add support for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Simon Glass
2020-01-23 11:48:15 -07:00
committed by Heiko Schocher
parent e71b6f6622
commit 96fe11c3da
3 changed files with 13 additions and 1 deletions
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10
drivers/i2c/designware_i2c.c
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@@ -220,6 +220,7 @@ static unsigned int __dw_i2c_set_bus_speed(struct dw_i2c *priv,
enum i2c_speed_mode i2c_spd;
unsigned int cntl;
unsigned int ena;
int spk_cnt;
int ret;
if (priv)
@@ -241,6 +242,13 @@ static unsigned int __dw_i2c_set_bus_speed(struct dw_i2c *priv,
cntl = (readl(&i2c_base->ic_con) & (~IC_CON_SPD_MSK));
/* Get the proper spike-suppression count based on target speed */
if (!priv || !priv->has_spk_cnt)
spk_cnt = 0;
else if (i2c_spd >= IC_SPEED_MODE_HIGH)
spk_cnt = readl(&i2c_base->hs_spklen);
else
spk_cnt = readl(&i2c_base->fs_spklen);
if (scl_sda_cfg) {
config.sda_hold = scl_sda_cfg->sda_hold;
if (i2c_spd == IC_SPEED_MODE_STANDARD) {
@@ -251,7 +259,7 @@ static unsigned int __dw_i2c_set_bus_speed(struct dw_i2c *priv,
config.scl_lcnt = scl_sda_cfg->fs_lcnt;
}
} else {
ret = dw_i2c_calc_timing(priv, i2c_spd, bus_clk, 0,
ret = dw_i2c_calc_timing(priv, i2c_spd, bus_clk, spk_cnt,
&config);
if (ret)
return log_msg_ret("gen_confg", ret);