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i2c: aspeed: Retain delay/setup/hold values when configuring bus frequency

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In addition to the base, low and high clock configuration, the AC timing
register #1 on the AST2400 houses fields controlling:

1. tBUF: Minimum delay between Stop and Start conditions
2. tHDSTA: Hold time for the Start condition
3. tACST: Setup time for Start and Stop conditions, and hold time for the
   Repeated Start condition

These values are defined in hardware on the AST2500 and therefore don't
need to be set.

aspeed_i2c_init_clk() was performing a direct write of the generated
clock values rather than a read/mask/modify/update sequence to retain
tBUF, tHDSTA and tACST, and therefore cleared the tBUF, tHDSTA and tACST
fields on the AST2400. This resulted in a delay/setup/hold time of 1
base clock, which in some configurations is not enough for some devices
(e.g. the MAX31785 fan controller, with an APB of 48MHz and a desired
bus speed of 100kHz).

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Tested-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Andrew Jeffery 2017-08-15 16:51:02 +09:30 committed by Wolfram Sang
parent 2f13f8c50a
commit 95fd3ad9cd
1 changed files with 8 additions and 1 deletions
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9
drivers/i2c/busses/i2c-aspeed.c
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@ -53,6 +53,9 @@
#define ASPEED_I2CD_MASTER_EN BIT(0)
/* 0x04 : I2CD Clock and AC Timing Control Register #1 */
#define ASPEED_I2CD_TIME_TBUF_MASK GENMASK(31, 28)
#define ASPEED_I2CD_TIME_THDSTA_MASK GENMASK(27, 24)
#define ASPEED_I2CD_TIME_TACST_MASK GENMASK(23, 20)
#define ASPEED_I2CD_TIME_SCL_HIGH_SHIFT 16
#define ASPEED_I2CD_TIME_SCL_HIGH_MASK GENMASK(19, 16)
#define ASPEED_I2CD_TIME_SCL_LOW_SHIFT 12
@ -743,7 +746,11 @@ static int aspeed_i2c_init_clk(struct aspeed_i2c_bus *bus)
u32 divisor, clk_reg_val;
divisor = DIV_ROUND_UP(bus->parent_clk_frequency, bus->bus_frequency);
clk_reg_val = bus->get_clk_reg_val(divisor);
clk_reg_val = readl(bus->base + ASPEED_I2C_AC_TIMING_REG1);
clk_reg_val &= (ASPEED_I2CD_TIME_TBUF_MASK |
ASPEED_I2CD_TIME_THDSTA_MASK |
ASPEED_I2CD_TIME_TACST_MASK);
clk_reg_val |= bus->get_clk_reg_val(divisor);
writel(clk_reg_val, bus->base + ASPEED_I2C_AC_TIMING_REG1);
writel(ASPEED_NO_TIMEOUT_CTRL, bus->base + ASPEED_I2C_AC_TIMING_REG2);