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| author | Armando Visconti <armando.visconti@st.com> | 2012-03-29 20:10:17 +0000 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2012-04-24 09:57:00 +0200 |
| commit | 5e3e8dda51c46faedb124c0ffd6136e2ef09ae52 (patch) | |
| tree | 9089a5c1e0322da753296e9147288ed27353d97d /drivers | |
| parent | 031ed2fa748ccfc746bd0e0073f8690c84a0d7b6 (diff) | |
| download | blackbird-obmc-uboot-5e3e8dda51c46faedb124c0ffd6136e2ef09ae52.tar.gz blackbird-obmc-uboot-5e3e8dda51c46faedb124c0ffd6136e2ef09ae52.zip | |
i2c:designware Turn off the ctrl when setting the speed
The designware i2c controller must be turned off before
setting the speed in IC_CON register, as stated in the
section 6.3.1 of the dw_apb_i2c_db.pdf.
Signed-off-by: Michel Sanches <michel.sanches@st.com>
Signed-off-by: Armando Visconti <armando.visconti@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/designware_i2c.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index d352146081..6d118acec4 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -40,6 +40,13 @@ static void set_speed(int i2c_spd) unsigned int cntl; unsigned int hcnt, lcnt; unsigned int high, low; + unsigned int enbl; + + /* to set speed cltr must be disabled */ + enbl = readl(&i2c_regs_p->ic_enable); + enbl &= ~IC_ENABLE_0B; + writel(enbl, &i2c_regs_p->ic_enable); + cntl = (readl(&i2c_regs_p->ic_con) & (~IC_CON_SPD_MSK)); @@ -71,6 +78,10 @@ static void set_speed(int i2c_spd) lcnt = (IC_CLK * low) / NANO_TO_MICRO; writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt); + + /* re-enable i2c ctrl back now that speed is set */ + enbl |= IC_ENABLE_0B; + writel(enbl, &i2c_regs_p->ic_enable); } /* |
