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designware_i2c: disable i2c controller during target address setup

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As it is stated in DesignWare I2C databook: writes to IC_TAR (0x4)
register succeed only when IC_ENABLE[0] is set to 0.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

Cc: Tom Rini <trini@ti.com>
cc: Armando Visconti <armando.visconti@st.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Heiko Schocher <hs@denx.de>
Cc: Vipin KUMAR <vipin.kumar@st.com>
Cc: Tom Rix <Tom.Rix@windriver.com>
Cc: Mischa Jonker <mjonker@synopsys.com>
This commit is contained in:
Alexey Brodkin 2013-11-07 17:52:18 +04:00 committed by Heiko Schocher
parent a2e0a45d2e
commit 8b7c872539
1 changed files with 12 additions and 0 deletions
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12
drivers/i2c/designware_i2c.c
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@ -151,7 +151,19 @@ void i2c_init(int speed, int slaveadd)
*/
static void i2c_setaddress(unsigned int i2c_addr)
{
unsigned int enbl;
/* Disable i2c */
enbl = readl(&i2c_regs_p->ic_enable);
enbl &= ~IC_ENABLE_0B;
writel(enbl, &i2c_regs_p->ic_enable);
writel(i2c_addr, &i2c_regs_p->ic_tar);
/* Enable i2c */
enbl = readl(&i2c_regs_p->ic_enable);
enbl |= IC_ENABLE_0B;
writel(enbl, &i2c_regs_p->ic_enable);
}
/*