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i2c:designware Turn off the ctrl when setting the speed

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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>
This commit is contained in:
Armando Visconti 2012-03-29 20:10:17 +00:00 committed by Heiko Schocher
parent 031ed2fa74
commit 5e3e8dda51
1 changed files with 11 additions and 0 deletions
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11
drivers/i2c/designware_i2c.c
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@ -40,6 +40,13 @@ static void set_speed(int i2c_spd)
unsigned int cntl; unsigned int cntl;
unsigned int hcnt, lcnt; unsigned int hcnt, lcnt;
unsigned int high, low; 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)); 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; lcnt = (IC_CLK * low) / NANO_TO_MICRO;
writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt); 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);
} }
/* /*