Re: [PATCHv8 04/18] I2C: OMAP: I2C register restore only if context is lost

Datta, Shubhrajyoti
2012-04-18T07:19:29Z

Hi Kevin,

> Hi Kevin,
> Thanks for your review,
>
> On Tue, Apr 17, 2012 at 7:15 PM, Kevin Hilman <khilman@ti.com> wrote:
>> Shubhrajyoti D <shubhrajyoti@ti.com> writes:
>>
>>>  Currently i2c register restore is done always.
>>>  Adding conditional restore.
>>>  The i2c register restore is done only if the context is lost.
>>
>> OK, minor comment below.

Thanks for the suggestion of the error case restore.
Updated the patch. Also added Tony's ack for the plat part.

From 1ca222f6f50868e07d9a46575e73dd66fd2d542e Mon Sep 17 00:00:00 2001
From: Shubhrajyoti D <shubhrajyoti@ti.com>
Date: Tue, 17 Jan 2012 16:13:03 +0530
Subject: [PATCH] I2C: OMAP: I2C register restore only if context is lost

Currently i2c register restore is done always.
Adding conditional restore.
The i2c register restore is done only if the context is lost
or in case of error to be on the safe side.
Also remove the definition of SYSS_RESETDONE_MASK and use the
one in omap_hwmod.h.

Cc: Kevin Hilman <khilman@ti.com>
[For the arch/arm/plat-omap/i2c.c part]
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
---
arch/arm/plat-omap/i2c.c | 3 ++
drivers/i2c/busses/i2c-omap.c | 53 +++++++++++++++++++++++++++--------------
include/linux/i2c-omap.h | 1 +
3 files changed, 39 insertions(+), 18 deletions(-)

diff --git a/arch/arm/plat-omap/i2c.c b/arch/arm/plat-omap/i2c.c
index db071bc..4ccab07 100644
--- a/arch/arm/plat-omap/i2c.c
+++ b/arch/arm/plat-omap/i2c.c
@@ -179,6 +179,9 @@ static inline int omap2_i2c_add_bus(int bus_id)
*/
if (cpu_is_omap34xx())
pdata->set_mpu_wkup_lat = omap_pm_set_max_mpu_wakeup_lat_compat;
+
+ pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
+
pdev = omap_device_build(name, bus_id, oh, pdata,
sizeof(struct omap_i2c_bus_platform_data),
NULL, 0, 0);
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index a882558..76cf066 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -43,6 +43,7 @@
#include <linux/slab.h>
#include <linux/i2c-omap.h>
#include <linux/pm_runtime.h>
+#include <plat/omap_device.h>

/* I2C controller revisions */
#define OMAP_I2C_OMAP1_REV_2 0x20
@@ -157,9 +158,6 @@ enum {
#define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */
#define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */

-/* 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)
@@ -184,6 +182,7 @@ struct omap_i2c_dev {
u32 latency; /* maximum mpu wkup latency */
void (*set_mpu_wkup_lat)(struct device *dev,
long latency);
+ int (*get_context_loss_count)(struct device *dev);
u32 speed; /* Speed of bus in kHz */
u32 dtrev; /* extra revision from DT */
u32 flags;
@@ -206,6 +205,7 @@ struct omap_i2c_dev {
u16 syscstate;
u16 westate;
u16 errata;
+ int dev_lost_count;
};

static const u8 reg_map_ip_v1[] = {
@@ -1025,6 +1025,7 @@ omap_i2c_probe(struct platform_device *pdev)
dev->speed = pdata->clkrate;
dev->flags = pdata->flags;
dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat;
+ dev->get_context_loss_count = pdata->get_context_loss_count;
dev->dtrev = pdata->rev;
}

@@ -1151,12 +1152,32 @@ omap_i2c_remove(struct platform_device *pdev)
}

#ifdef CONFIG_PM_RUNTIME
+static void omap_i2c_restore(struct omap_i2c_dev *dev)
+{
+ omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
+ omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate);
+ omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate);
+ omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, dev->sclhstate);
+ omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, dev->bufstate);
+ omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate);
+ omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
+ /*
+ * Don't write to this register if the IE state is 0 as it can
+ * cause deadlock.
+ */
+ if (dev->iestate)
+ omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
+
+}
static int omap_i2c_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_i2c_dev *_dev = platform_get_drvdata(pdev);
u16 iv;

+ if (_dev->get_context_loss_count)
+ _dev->dev_lost_count = _dev->get_context_loss_count(dev);
+
_dev->iestate = omap_i2c_read_reg(_dev, OMAP_I2C_IE_REG);
if (_dev->dtrev == OMAP_I2C_IP_VERSION_2)
omap_i2c_write_reg(_dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, 1);
@@ -1179,24 +1200,20 @@ static int omap_i2c_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_i2c_dev *_dev = platform_get_drvdata(pdev);
+ int loss_cnt;

- if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
- omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0);
- omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate);
- omap_i2c_write_reg(_dev, OMAP_I2C_SCLL_REG, _dev->scllstate);
- omap_i2c_write_reg(_dev, OMAP_I2C_SCLH_REG, _dev->sclhstate);
- omap_i2c_write_reg(_dev, OMAP_I2C_BUF_REG, _dev->bufstate);
- omap_i2c_write_reg(_dev, OMAP_I2C_SYSC_REG, _dev->syscstate);
- omap_i2c_write_reg(_dev, OMAP_I2C_WE_REG, _dev->westate);
- omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
+ if (_dev->get_context_loss_count) {
+ loss_cnt = _dev->get_context_loss_count(dev);
+ if (loss_cnt < 0) {
+ omap_i2c_restore(_dev);
+ return 0;
+ }
+ if (_dev->dev_lost_count == loss_cnt && _dev->dev_lost_count)
+ return 0;
}

- /*
- * Don't write to this register if the IE state is 0 as it can
- * cause deadlock.
- */
- if (_dev->iestate)
- omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, _dev->iestate);
+ if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE)
+ omap_i2c_restore(_dev);

return 0;
}
diff --git a/include/linux/i2c-omap.h b/include/linux/i2c-omap.h
index 92a0dc7..c76cbc0 100644
--- a/include/linux/i2c-omap.h
+++ b/include/linux/i2c-omap.h
@@ -35,6 +35,7 @@ struct omap_i2c_bus_platform_data {
u32 rev;
u32 flags;
void (*set_mpu_wkup_lat)(struct device *dev, long set);
+ int (*get_context_loss_count)(struct device *dev);
};

#endif
--
1.7.5.4
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html