AuxXxilium/linux_dsm_epyc7002
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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

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Pull i2c fix from Wolfram Sang:
 "Here is the revert for the regression of the i2c-octeon driver I
  mentioned last time. I wished for a bit more feedback, but all people
  working actively on it are in need of this patch, so here it goes"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  Revert "i2c: octeon: thunderx: Limit register access retries"
This commit is contained in:
Linus Torvalds 2016-12-02 09:12:44 -08:00
commit 3e52d063d8
2 changed files with 12 additions and 19 deletions
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4
drivers/i2c/busses/i2c-octeon-core.c
View File

@ -381,9 +381,7 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
if (result)
return result;
data[i] = octeon_i2c_data_read(i2c, &result);
if (result)
return result;
data[i] = octeon_i2c_data_read(i2c);
if (recv_len && i == 0) {
if (data[i] > I2C_SMBUS_BLOCK_MAX + 1)
return -EPROTO;

27
drivers/i2c/busses/i2c-octeon-core.h
View File

@ -5,7 +5,6 @@
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/pci.h>
@ -145,9 +144,9 @@ static inline void octeon_i2c_reg_write(struct octeon_i2c *i2c, u64 eop_reg, u8
u64 tmp;
__raw_writeq(SW_TWSI_V | eop_reg | data, i2c->twsi_base + SW_TWSI(i2c));
readq_poll_timeout(i2c->twsi_base + SW_TWSI(i2c), tmp, tmp & SW_TWSI_V,
I2C_OCTEON_EVENT_WAIT, i2c->adap.timeout);
do {
tmp = __raw_readq(i2c->twsi_base + SW_TWSI(i2c));
} while ((tmp & SW_TWSI_V) != 0);
}
#define octeon_i2c_ctl_write(i2c, val) \
@ -164,28 +163,24 @@ static inline void octeon_i2c_reg_write(struct octeon_i2c *i2c, u64 eop_reg, u8
*
* The I2C core registers are accessed indirectly via the SW_TWSI CSR.
*/
static inline int octeon_i2c_reg_read(struct octeon_i2c *i2c, u64 eop_reg,
int *error)
static inline u8 octeon_i2c_reg_read(struct octeon_i2c *i2c, u64 eop_reg)
{
u64 tmp;
int ret;
__raw_writeq(SW_TWSI_V | eop_reg | SW_TWSI_R, i2c->twsi_base + SW_TWSI(i2c));
do {
tmp = __raw_readq(i2c->twsi_base + SW_TWSI(i2c));
} while ((tmp & SW_TWSI_V) != 0);
ret = readq_poll_timeout(i2c->twsi_base + SW_TWSI(i2c), tmp,
tmp & SW_TWSI_V, I2C_OCTEON_EVENT_WAIT,
i2c->adap.timeout);
if (error)
*error = ret;
return tmp & 0xFF;
}
#define octeon_i2c_ctl_read(i2c) \
octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_CTL, NULL)
#define octeon_i2c_data_read(i2c, error) \
octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_DATA, error)
octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_CTL)
#define octeon_i2c_data_read(i2c) \
octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_DATA)
#define octeon_i2c_stat_read(i2c) \
octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT, NULL)
octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT)
/**
* octeon_i2c_read_int - read the TWSI_INT register