On 7/21/2011 4:39 PM, Shubhrajyoti D wrote:
The reset in the driver at init is not needed
anymore as the hwmod framework takes care of
reseting it.
Signed-off-by: Shubhrajyoti D<shubhrajyoti@xxxxxx>
---
drivers/i2c/busses/i2c-omap.c | 73 ++++++++++++----------------------------
1 files changed, 22 insertions(+), 51 deletions(-)
Excellent cleanup. Some minor coments
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 8f87a37..8dc54d5 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -155,9 +155,6 @@ enum {
#define OMAP_I2C_SYSTEST_SDA_O (1<< 0) /* SDA line drive out */
#endif
-/* OCP_SYSSTATUS bit definitions */
-#define SYSS_RESETDONE_MASK (1<< 0)
-
/* OCP_SYSCONFIG bit definitions */
#define SYSC_CLOCKACTIVITY_MASK (0x3<< 8)
#define SYSC_SIDLEMODE_MASK (0x3<< 3)
@@ -182,6 +179,7 @@ struct omap_i2c_dev {
u32 latency; /* maximum mpu wkup latency */
void (*set_mpu_wkup_lat)(struct device *dev,
long latency);
+ int (*device_reset)(struct device *dev);
u32 speed; /* Speed of bus in Khz */
u16 cmd_err;
u8 *buf;
@@ -332,7 +330,6 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
u16 psc = 0, scll = 0, sclh = 0, buf = 0;
u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0;
unsigned long fclk_rate = 12000000;
- unsigned long timeout;
unsigned long internal_clk = 0;
struct clk *fclk;
struct platform_device *pdev;
@@ -341,53 +338,16 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
pdev = to_platform_device(dev->dev);
pdata = pdev->dev.platform_data;
- if (dev->rev>= OMAP_I2C_OMAP1_REV_2) {
- /* Disable I2C controller before soft reset */
- omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
- omap_i2c_read_reg(dev, OMAP_I2C_CON_REG)&
- ~(OMAP_I2C_CON_EN));
-
- omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK);
- /* For some reason we need to set the EN bit before the
- * reset done bit gets set. */
- timeout = jiffies + OMAP_I2C_TIMEOUT;
- omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
- while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG)&
- SYSS_RESETDONE_MASK)) {
- if (time_after(jiffies, timeout)) {
- dev_warn(dev->dev, "timeout waiting "
- "for controller reset\n");
- return -ETIMEDOUT;
- }
- msleep(1);
- }
-
- /* SYSC register is cleared by the reset; rewrite it */
- if (dev->rev == OMAP_I2C_REV_ON_2430) {
-
- omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
- SYSC_AUTOIDLE_MASK);
-
- } else if (dev->rev>= OMAP_I2C_REV_ON_3430) {
- dev->syscstate = SYSC_AUTOIDLE_MASK;
- dev->syscstate |= SYSC_ENAWAKEUP_MASK;
- dev->syscstate |= (SYSC_IDLEMODE_SMART<<
- __ffs(SYSC_SIDLEMODE_MASK));
- dev->syscstate |= (SYSC_CLOCKACTIVITY_FCLK<<
- __ffs(SYSC_CLOCKACTIVITY_MASK));
-
- omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
- dev->syscstate);
- /*
- * Enabling all wakup sources to stop I2C freezing on
- * WFI instruction.
- * REVISIT: Some wkup sources might not be needed.
- */
- dev->westate = OMAP_I2C_WE_ALL;
- if (dev->rev< OMAP_I2C_REV_ON_3530_4430)
- omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
- dev->westate);
- }
+ if (dev->rev>= OMAP_I2C_REV_ON_3430) {
Space please if (dev->rev >= OMAP_I2C_REV_ON_3430) {
+ /*
+ * Enabling all wakup sources to stop I2C freezing on
+ * WFI instruction.
+ * REVISIT: Some wkup sources might not be needed.
+ */
Surely not related to your patch. But the 'REVISIT:' caught
my attention. Is the comment still valid.
+ dev->westate = OMAP_I2C_WE_ALL;
+ if (dev->rev< OMAP_I2C_REV_ON_3530_4430)
Space if (dev->rev < OMAP_I2C_REV_ON_3530_4430)
+ omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
+ dev->westate);
}
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
@@ -612,6 +572,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
return r;
if (r == 0) {
dev_err(dev->dev, "controller timed out\n");
+ if (dev->device_reset != NULL) {
+ r = dev->device_reset(dev->dev);
+ if (r< 0)
ditto
+ dev_err(dev->dev, "reset failed\n");
+ }
omap_i2c_init(dev);
return -ETIMEDOUT;
}
@@ -622,6 +587,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
/* We have an error */
if (dev->cmd_err& (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR |
You can fix this one as well.
OMAP_I2C_STAT_XUDF)) {
+ if (dev->device_reset != NULL) {
+ r = dev->device_reset(dev->dev);
+ if (r< 0)
here too.
+ dev_err(dev->dev, "reset failed\n");
+ }
omap_i2c_init(dev);
return -EIO;
}
@@ -1024,6 +994,7 @@ omap_i2c_probe(struct platform_device *pdev)
if (pdata != NULL) {
speed = pdata->clkrate;
dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat;
+ dev->device_reset = pdata->device_reset;
} else {
speed = 100; /* Default speed */
dev->set_mpu_wkup_lat = NULL;
Regards
Santosh
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