diff options
| author | Jun Chen <jun.chen@vatics.com> | 2020-03-02 16:58:55 +0800 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2020-03-16 08:04:09 +0100 |
| commit | 565e328b959b58c181fdec33b2e161ada90dd521 (patch) | |
| tree | b46626db87850386a3d6a572d5882c96ee91ae10 /drivers/i2c | |
| parent | 70c894f85e9e116b8f215f522ed96b60ac60f201 (diff) | |
i2c: designware_i2c: check is high speed possible support
To read IC_COMP_PARAM_1[3:2] to check is high speed possible,
and fall back to fast mode if not.
Signed-off-by: Jun Chen <ptchentw@gmail.com>
Signed-off-by: Jun Chen <jun.chen@vatics.com>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/designware_i2c.c | 10 | ||||
| -rw-r--r-- | drivers/i2c/designware_i2c.h | 3 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index 9186fcb7dc..f4fbf3ba9f 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -203,9 +203,12 @@ static int calc_bus_speed(struct dw_i2c *priv, int speed, ulong bus_clk, const struct dw_scl_sda_cfg *scl_sda_cfg = NULL; struct i2c_regs *regs = priv->regs; enum i2c_speed_mode i2c_spd; + u32 comp_param1; int spk_cnt; int ret; + comp_param1 = readl(®s->comp_param1); + if (priv) scl_sda_cfg = priv->scl_sda_cfg; /* Allow high speed if there is no config, or the config allows it */ @@ -219,6 +222,13 @@ static int calc_bus_speed(struct dw_i2c *priv, int speed, ulong bus_clk, else i2c_spd = IC_SPEED_MODE_STANDARD; + /* Check is high speed possible and fall back to fast mode if not */ + if (i2c_spd == IC_SPEED_MODE_HIGH) { + if ((comp_param1 & DW_IC_COMP_PARAM_1_SPEED_MODE_MASK) + != DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH) + i2c_spd = IC_SPEED_MODE_FAST; + } + /* Get the proper spike-suppression count based on target speed */ if (!priv || !priv->has_spk_cnt) spk_cnt = 0; diff --git a/drivers/i2c/designware_i2c.h b/drivers/i2c/designware_i2c.h index 61a882cb65..23f311b61c 100644 --- a/drivers/i2c/designware_i2c.h +++ b/drivers/i2c/designware_i2c.h @@ -138,6 +138,9 @@ struct i2c_regs { #define IC_STATUS_TFNF 0x0002 #define IC_STATUS_ACT 0x0001 +#define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH (BIT(2) | BIT(3)) +#define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK (BIT(2) | BIT(3)) + /** * struct dw_scl_sda_cfg - I2C timing configuration * |