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i2c: designware: make HCNT/LCNT values configurable

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The DesignWare I2C controller has high count (HCNT) and low count (LCNT)
registers for each of the I2C speed modes (standard and fast). These
registers are programmed based on the input clock speed in the driver.

The current code calculates these values based on the input clock speed and
tries hard to meet the I2C bus timing requirements. This could result
non-optimal values with regarding to the bus speed. For example on Intel
BayTrail we get bus speed of 315.41kHz which is ~20% slower than we would
expect (400kHz) in fast mode (even though the timing requirements are met).

This patch makes it possible for the platform code to pass more optimal
HCNT/LCNT values to the core driver if they are known beforehand. If these
are not set we use the calculated and more conservative values.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Shinya Kuribayashi <skuribay@pobox.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Mika Westerberg 2013-08-19 15:07:53 +03:00 committed by Wolfram Sang
parent b3bfce2bc2
commit defc0b2fb5
2 changed files with 23 additions and 0 deletions
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11
drivers/i2c/busses/i2c-designware-core.c
View File

@ -317,6 +317,12 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
47, /* tLOW = 4.7 us */
3, /* tf = 0.3 us */
0); /* No offset */
/* Allow platforms to specify the ideal HCNT and LCNT values */
if (dev->ss_hcnt && dev->ss_lcnt) {
hcnt = dev->ss_hcnt;
lcnt = dev->ss_lcnt;
}
dw_writel(dev, hcnt, DW_IC_SS_SCL_HCNT);
dw_writel(dev, lcnt, DW_IC_SS_SCL_LCNT);
dev_dbg(dev->dev, "Standard-mode HCNT:LCNT = %d:%d\n", hcnt, lcnt);
@ -331,6 +337,11 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
13, /* tLOW = 1.3 us */
3, /* tf = 0.3 us */
0); /* No offset */
if (dev->fs_hcnt && dev->fs_lcnt) {
hcnt = dev->fs_hcnt;
lcnt = dev->fs_lcnt;
}
dw_writel(dev, hcnt, DW_IC_FS_SCL_HCNT);
dw_writel(dev, lcnt, DW_IC_FS_SCL_LCNT);
dev_dbg(dev->dev, "Fast-mode HCNT:LCNT = %d:%d\n", hcnt, lcnt);

12
drivers/i2c/busses/i2c-designware-core.h
View File

@ -61,6 +61,14 @@
* @tx_fifo_depth: depth of the hardware tx fifo
* @rx_fifo_depth: depth of the hardware rx fifo
* @rx_outstanding: current master-rx elements in tx fifo
* @ss_hcnt: standard speed HCNT value
* @ss_lcnt: standard speed LCNT value
* @fs_hcnt: fast speed HCNT value
* @fs_lcnt: fast speed LCNT value
*
* HCNT and LCNT parameters can be used if the platform knows more accurate
* values than the one computed based only on the input clock frequency.
* Leave them to be %0 if not used.
*/
struct dw_i2c_dev {
struct device *dev;
@ -91,6 +99,10 @@ struct dw_i2c_dev {
unsigned int rx_fifo_depth;
int rx_outstanding;
u32 sda_hold_time;
u16 ss_hcnt;
u16 ss_lcnt;
u16 fs_hcnt;
u16 fs_lcnt;
};
#define ACCESS_SWAP 0x00000001