[PATCHv10 00/11] I2C fixes

[PATCHv10 00/11] I2C fixes

[Shubhrajyoti D]

The patch series does the following

- Warn fixes if CONFIG_PM_RUNTIME is not selected.
- In case of i2c remove register access was done without any
 get_sync fix the same.
- Folds a patch from Tasslehoff to prevent any merge conflicts.
- Prevents the XDUF flag to be set if the underflow condition is not met.
- As per discussion in [1] .Adds a patch to rename the 1p153 errata and
 use the unique id instead as the section number in the recent errata
 docs has changed.

v9:
Fix the comments from Wolfram Sang

v10:
Add a patch from Neil to the series.
Fix kevin comments
update the patches with comments.

[1] http://www.spinics.net/lists/linux-i2c/msg07607.html

Tested on omap4sdp and omap3sdp.
- Did functional tests read write on both the platforms.
- Off mode and retention on OMAP3
- On OMAP4 just did echo mem > /sys/power/state and wakeup.
Did see.
[ 1360.595855] Successfully put all powerdomains to target state
However didnt see the ret count for other than mpu_pwrdm increase.
I think power support for omap4 is minimal. 

The following changes since commit b48b2c3e50433ff6f7e46186daa7f986bd960215:

  openrisc: use generic strnlen_user() function (2012-05-27 21:00:32 -0700)

are available in the git repository at:
  git://gitorious.org/linus-tree/linus-tree.git i2c_omap-fixes

Neil Brown (1):
      OMAP/I2C - Fix timeout problem during suspend.

Shubhrajyoti D (9):
      I2C: OMAP: make omap_i2c_unidle/idle functions depend on CONFIG_PM_RUNTIME
      I2C: OMAP: Fix the mismatch of pm_runtime enable and disable
      I2C: OMAP: Fix the interrupt clearing in OMAP4
      I2C: OMAP: Prevent the register access after pm_runtime_put in probe
      I2C: OMAP: Don't check if wait_for_completion_timeout() returns less than zero
      I2C: OMAP: Fix the crash in i2c remove
      I2C: OMAP: Handle error check for pm runtime
      I2C: OMAP: Do not set the XUDF(Transmit underflow) if the underflow is not reached
      I2C: OMAP: Rename the 1p153 to the erratum id i462

Tasslehoff Kjappfot (1):
      I2C: OMAP: prevent the overwrite of the errata flags

 drivers/i2c/busses/i2c-omap.c |  129 ++++++++++++++++++++---------------------
 1 files changed, 63 insertions(+), 66 deletions(-)

-- 
1.7.5.4

[PATCHv10 05/11] I2C: OMAP: Don't check if wait_for_completion_timeout() returns less than zero

[Shubhrajyoti D]

By definition, wait_for_completion_timeout() returns an unsigned value and
therefore, it is not necessary to check if the return value is less than zero
as this is not possible.

This is based on a patch from Jon Hunter <jon-hunter@ti.com>
Changes from his patch
- Declare a long as the wait_for_completion_timeout returns long.

Original patch is
http://git.omapzoom.org/?p=kernel/omap.git;a=commitdiff;h=ea02cece7b0000bc736e60c4188a11aaa74bc6e6

Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
---
-v9 Added Jon's sob

 drivers/i2c/busses/i2c-omap.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 1777d79..fec8d5c 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -473,7 +473,7 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
 			     struct i2c_msg *msg, int stop)
 {
 	struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
-	int r;
+	unsigned long timeout;
 	u16 w;
 
 	dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
@@ -541,12 +541,10 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
 	 * REVISIT: We should abort the transfer on signals, but the bus goes
 	 * into arbitration and we're currently unable to recover from it.
 	 */
-	r = wait_for_completion_timeout(&dev->cmd_complete,
-					OMAP_I2C_TIMEOUT);
+	timeout = wait_for_completion_timeout(&dev->cmd_complete,
+						OMAP_I2C_TIMEOUT);
 	dev->buf_len = 0;
-	if (r < 0)
-		return r;
-	if (r == 0) {
+	if (timeout == 0) {
 		dev_err(dev->dev, "controller timed out\n");
 		omap_i2c_init(dev);
 		return -ETIMEDOUT;
-- 
1.7.5.4

[PATCHv10 08/11] I2C: OMAP: prevent the overwrite of the errata flags

[Shubhrajyoti D]

From: Tasslehoff Kjappfot <tasskjapp@gmail.com>

i2c_probe set the dev->errata flag, but omap_i2c_init cleared the flag again.
Prevent the overwrite of the errata flags.Move the errata handling to a unified
place in probe to prevent such errors.

Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Tasslehoff Kjappfot <tasskjapp@gmail.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
---
-v9  Update the changelogs to be more explainatory.

 drivers/i2c/busses/i2c-omap.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index c39b72f..6129cb8 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -427,11 +427,6 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 	/* Take the I2C module out of reset: */
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
 
-	dev->errata = 0;
-
-	if (dev->flags & OMAP_I2C_FLAG_APPLY_ERRATA_I207)
-		dev->errata |= I2C_OMAP_ERRATA_I207;
-
 	/* Enable interrupts */
 	dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
 			OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
@@ -1019,6 +1014,11 @@ omap_i2c_probe(struct platform_device *pdev)
 
 	dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
 
+	dev->errata = 0;
+
+	if (dev->flags & OMAP_I2C_FLAG_APPLY_ERRATA_I207)
+		dev->errata |= I2C_OMAP_ERRATA_I207;
+
 	if (dev->rev <= OMAP_I2C_REV_ON_3430)
 		dev->errata |= I2C_OMAP3_1P153;
 
-- 
1.7.5.4

[PATCHv10 01/11] I2C: OMAP: make omap_i2c_unidle/idle functions depend on CONFIG_PM_RUNTIME

[Shubhrajyoti D]

The functions omap_i2c_unidle/idle are called from omap_i2c_runtime_resume
and omap_i2c_runtime_suspend which is compiled for CONFIG_PM_RUNTIME.
This patch removes the omap_i2c_unidle/idle functions and folds them
into the runtime callbacks.

This fixes the below warn when CONFIG_PM_RUNTIME is not defined

 CC      arch/arm/mach-omap2/board-ti8168evm.o
drivers/i2c/busses/i2c-omap.c:272: warning: 'omap_i2c_unidle' defined but not used
drivers/i2c/busses/i2c-omap.c:293: warning: 'omap_i2c_idle' defined but not used
  CC      net/ipv4/ip_forward.o

Reviewed-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
---
 drivers/i2c/busses/i2c-omap.c |   75 +++++++++++++++++-----------------------
 1 files changed, 32 insertions(+), 43 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 801df60..4f4188d 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -269,47 +269,6 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
 				(i2c_dev->regs[reg] << i2c_dev->reg_shift));
 }
 
-static void omap_i2c_unidle(struct omap_i2c_dev *dev)
-{
-	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);
-	}
-
-	/*
-	 * 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 void omap_i2c_idle(struct omap_i2c_dev *dev)
-{
-	u16 iv;
-
-	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);
-	else
-		omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
-
-	if (dev->rev < OMAP_I2C_OMAP1_REV_2) {
-		iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
-	} else {
-		omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
-
-		/* Flush posted write */
-		omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
-	}
-}
-
 static int omap_i2c_init(struct omap_i2c_dev *dev)
 {
 	u16 psc = 0, scll = 0, sclh = 0, buf = 0;
@@ -1163,8 +1122,22 @@ 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;
+
+	_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);
+	else
+		omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0);
+
+	if (_dev->rev < OMAP_I2C_OMAP1_REV_2) {
+		iv = omap_i2c_read_reg(_dev, OMAP_I2C_IV_REG); /* Read clears */
+	} else {
+		omap_i2c_write_reg(_dev, OMAP_I2C_STAT_REG, _dev->iestate);
 
-	omap_i2c_idle(_dev);
+		/* Flush posted write */
+		omap_i2c_read_reg(_dev, OMAP_I2C_STAT_REG);
+	}
 
 	return 0;
 }
@@ -1174,7 +1147,23 @@ 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);
 
-	omap_i2c_unidle(_dev);
+	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);
+	}
+
+	/*
+	 * 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);
 
 	return 0;
 }
-- 
1.7.5.4

[PATCHv10 02/11] I2C: OMAP: Fix the mismatch of pm_runtime enable and disable

[Shubhrajyoti D]

Currently the i2c driver calls the pm_runtime_enable and never
the disable. This may cause a warning when pm_runtime_enable
checks for the count match.Fix the same by calling
pm_runtime_disable in the error and the remove path.

Cc: Rajendra Nayak <rnayak-l0cyMroinI0@public.gmane.org>
Acked-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
---
-v10 Adding Kevin's ack.
-v9 Remove attempting from the changelogs.

 drivers/i2c/busses/i2c-omap.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 4f4188d..c851672 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1090,6 +1090,7 @@ err_unuse_clocks:
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
 	pm_runtime_put(dev->dev);
 	iounmap(dev->base);
+	pm_runtime_disable(&pdev->dev);
 err_free_mem:
 	platform_set_drvdata(pdev, NULL);
 	kfree(dev);
@@ -1110,6 +1111,7 @@ omap_i2c_remove(struct platform_device *pdev)
 	free_irq(dev->irq, dev);
 	i2c_del_adapter(&dev->adapter);
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
+	pm_runtime_disable(&pdev->dev);
 	iounmap(dev->base);
 	kfree(dev);
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-- 
1.7.5.4

[PATCHv10 03/11] I2C: OMAP: Fix the interrupt clearing in OMAP4

[Shubhrajyoti D]

On OMAP4 we were writing 1 to IRQENABLE_CLR which cleared only
the arbitration lost interrupt. The patch intends to fix the same by writing 0
to the IE register clearing all interrupts.

This is based on the work done by Vikram Pandita <vikram.pandita-l0cyMroinI0@public.gmane.org>.

The  changes from the original patch ...
-  Does not use the IRQENABLE_CLR register to clear as it is not mentioned
  to be legacy register IRQENABLE_CLR helps in  atomically
  setting/clearing specific interrupts, instead use the OMAP_I2C_IE_REG as we
  are clearing all interrupts.

Cc: Vikram Pandita <vikram.pandita-l0cyMroinI0@public.gmane.org>
Reviewed-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
---
 drivers/i2c/busses/i2c-omap.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index c851672..bf07ffd 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1127,10 +1127,8 @@ static int omap_i2c_runtime_suspend(struct device *dev)
 	u16 iv;
 
 	_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);
-	else
-		omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0);
+
+	omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0);
 
 	if (_dev->rev < OMAP_I2C_OMAP1_REV_2) {
 		iv = omap_i2c_read_reg(_dev, OMAP_I2C_IV_REG); /* Read clears */
-- 
1.7.5.4

[PATCHv10 04/11] I2C: OMAP: Prevent the register access after pm_runtime_put in probe

[Shubhrajyoti D]

Currently in probe
pm_runtime_put(dev->dev);

...
        /* i2c device drivers may be active on return from add_adapter() */
        adap->nr = pdev->id;
        r = i2c_add_numbered_adapter(adap);
        if (r) {
                dev_err(dev->dev, "failure adding adapter\n");
                goto err_free_irq;
        }
...

return 0;

err_free_irq:
        free_irq(dev->irq, dev);
err_unuse_clocks:
        omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
        pm_runtime_put(dev->dev);

This may access the i2c registers without the clocks in the error cases.
Fix the same by moving the pm_runtime_put after the error check.

Reviewed-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
---
-v9 Changed the $SUBJECT as it was too generic.
-v9 Dropping attempting

 drivers/i2c/busses/i2c-omap.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index bf07ffd..1777d79 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1061,8 +1061,6 @@ omap_i2c_probe(struct platform_device *pdev)
 	dev_info(dev->dev, "bus %d rev%d.%d.%d at %d kHz\n", pdev->id,
 		 dev->dtrev, dev->rev >> 4, dev->rev & 0xf, dev->speed);
 
-	pm_runtime_put(dev->dev);
-
 	adap = &dev->adapter;
 	i2c_set_adapdata(adap, dev);
 	adap->owner = THIS_MODULE;
@@ -1082,6 +1080,8 @@ omap_i2c_probe(struct platform_device *pdev)
 
 	of_i2c_register_devices(adap);
 
+	pm_runtime_put(dev->dev);
+
 	return 0;
 
 err_free_irq:
-- 
1.7.5.4

[PATCH 06/11] I2C: OMAP: Fix the crash in i2c remove

[Shubhrajyoti D]

    In omap_i2c_remove we are accessing the I2C_CON register without
    enabling the clocks. Fix the same by ensure device is accessible by calling
    pm_runtime_get_sync before accessing the registers and calling pm_runtime_put
    after accessing.

    This fixes the following crash.
    [  154.723022] ------------[ cut here ]------------
    [  154.725677] WARNING: at arch/arm/mach-omap2/omap_l3_noc.c:112 l3_interrupt_handler+0x1b4/0x1c4()
    [  154.725677] L3 custom error: MASTER:MPU TARGET:L4 PER2
    [  154.742614] Modules linked in: i2c_omap(-)
    [  154.746948] Backtrace:
    [  154.746948] [<c0013078>] (dump_backtrace+0x0/0x110) from [<c026c158>] (dump_stack+0x18/0x1c)
    [  154.752716]  r6:00000070 r5:c002c43c r4:df9b9e98 r3:df9b8000
    [  154.764465] [<c026c140>] (dump_stack+0x0/0x1c) from [<c0041a2c>] (warn_slowpath_common+0x5c/0x6c)
    [  154.768341] [<c00419d0>] (warn_slowpath_common+0x0/0x6c) from [<c0041ae0>] (warn_slowpath_fmt+0x38/0x40)
    [  154.776153]  r8:00000180 r7:c0361594 r6:c0379b48 r5:00080003 r4:e0838b00
    [  154.790771] r3:00000009
    [  154.791778] [<c0041aa8>] (warn_slowpath_fmt+0x0/0x40) from [<c002c43c>] (l3_interrupt_handler+0x1b4/0x1c4)
    [  154.803710]  r3:c0361598 r2:c02ef74c
    [  154.807403] [<c002c288>] (l3_interrupt_handler+0x0/0x1c4) from [<c0085f44>] (handle_irq_event_percpu+0x58/0
    [  154.818237]  r8:0000002a r7:00000000 r6:00000000 r5:df808054 r4:df8893c0
    [  154.825378] [<c0085eec>] (handle_irq_event_percpu+0x0/0x188) from [<c00860b8>] (handle_irq_event+0x44/0x64)
    [  154.835662] [<c0086074>] (handle_irq_event+0x0/0x64) from [<c0088ec0>] (handle_fasteoi_irq+0xa4/0x10c)
    [  154.845458]  r6:0000002a r5:df808054 r4:df808000 r3:c034a150
    [  154.846466] [<c0088e1c>] (handle_fasteoi_irq+0x0/0x10c) from [<c0085ed0>] (generic_handle_irq+0x30/0x38)
    [  154.854278]  r5:c034aa48 r4:0000002a
    [  154.862091] [<c0085ea0>] (generic_handle_irq+0x0/0x38) from [<c000fd38>] (handle_IRQ+0x60/0xc0)
    [  154.874450]  r4:c034ea70 r3:000001f8
    [  154.878234] [<c000fcd8>] (handle_IRQ+0x0/0xc0) from [<c0008478>] (gic_handle_irq+0x20/0x5c)
    [  154.887023]  r7:ffffff40 r6:df9b9fb0 r5:c034e2b4 r4:0000001a
    [  154.887054] [<c0008458>] (gic_handle_irq+0x0/0x5c) from [<c000ea80>] (__irq_usr+0x40/0x60)
    [  154.901153] Exception stack(0xdf9b9fb0 to 0xdf9b9ff8)
    [  154.907104] 9fa0:                                     beaf1f04 4006be00 0000000f 0000000c
    [  154.915710] 9fc0: 4006c000 00000000 00008034 ffffff40 00000007 00000000 00000000 0007b8d7
    [  154.916778] 9fe0: 00000000 beaf1b68 0000d23c 4005baf0 80000010 ffffffff
    [  154.931335]  r6:ffffffff r5:80000010 r4:4005baf0 r3:beaf1f04
    [  154.937316] ---[ end trace 1b75b31a2719ed21 ]--

Cc: Rajendra Nayak <rnayak-l0cyMroinI0@public.gmane.org>
Cc: Linux PM list <linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Reviewed-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
---
-v10 Instead of "clock enable" use "device is accessible" as runtime
does much more.

 drivers/i2c/busses/i2c-omap.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index fec8d5c..44e8cfa 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1108,7 +1108,9 @@ omap_i2c_remove(struct platform_device *pdev)
 
 	free_irq(dev->irq, dev);
 	i2c_del_adapter(&dev->adapter);
+	pm_runtime_get_sync(&pdev->dev);
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
+	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	iounmap(dev->base);
 	kfree(dev);
-- 
1.7.5.4

[PATCH 07/11] I2C: OMAP: Handle error check for pm runtime

[Shubhrajyoti D]

If PM runtime get_sync fails return with the error
so that no further reads/writes goes through the interface.
This will avoid possible abort. Add a error message in case
of failure with the cause of the failure.

Reviewed-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
---
-v10 Use IS_ERR_VALUE
-v9 Fix the error handling

 drivers/i2c/busses/i2c-omap.c |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 44e8cfa..c39b72f 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -585,7 +585,9 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 	int i;
 	int r;
 
-	pm_runtime_get_sync(dev->dev);
+	r = pm_runtime_get_sync(dev->dev);
+	if (IS_ERR_VALUE(r))
+		return r;
 
 	r = omap_i2c_wait_for_bb(dev);
 	if (r < 0)
@@ -1011,7 +1013,9 @@ omap_i2c_probe(struct platform_device *pdev)
 		dev->regs = (u8 *)reg_map_ip_v1;
 
 	pm_runtime_enable(dev->dev);
-	pm_runtime_get_sync(dev->dev);
+	r = pm_runtime_get_sync(dev->dev);
+	if (IS_ERR_VALUE(r))
+		goto err_free_mem;
 
 	dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
 
@@ -1103,12 +1107,16 @@ omap_i2c_remove(struct platform_device *pdev)
 {
 	struct omap_i2c_dev	*dev = platform_get_drvdata(pdev);
 	struct resource		*mem;
+	int ret;
 
 	platform_set_drvdata(pdev, NULL);
 
 	free_irq(dev->irq, dev);
 	i2c_del_adapter(&dev->adapter);
-	pm_runtime_get_sync(&pdev->dev);
+	ret = pm_runtime_get_sync(&pdev->dev);
+	if (IS_ERR_VALUE(ret))
+		return ret;
+
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-- 
1.7.5.4

Re: [PATCH 07/11] I2C: OMAP: Handle error check for pm runtime

[Kevin Hilman]

Shubhrajyoti D <shubhrajyoti@ti.com> writes:

> If PM runtime get_sync fails return with the error
> so that no further reads/writes goes through the interface.
> This will avoid possible abort. Add a error message in case
> of failure with the cause of the failure.
>
> Reviewed-by: Kevin Hilman <khilman@ti.com>
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>

This patch introduced a regression where the runtime PM usecount will
never reach zero and so CORE retention is prevented after any xfer
failures...

> ---
> -v10 Use IS_ERR_VALUE
> -v9 Fix the error handling
>
>  drivers/i2c/busses/i2c-omap.c |   14 +++++++++++---
>  1 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index 44e8cfa..c39b72f 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -585,7 +585,9 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
>  	int i;
>  	int r;
>  
> -	pm_runtime_get_sync(dev->dev);
> +	r = pm_runtime_get_sync(dev->dev);<
> +	if (IS_ERR_VALUE(r))
> +		return r;

This return should be 'goto out' so the runtime PM usecount is
decremented by the 'put'.  Otherwise, after failure, the usecount
remains non-zero, so the device is considered 'active' and keeps the
containing power domain active.

I found this on a 3730/OveroSTORM where the suspend/resume of MMC fails
because I2C is already suspended.  After the suspend though, the CORE
powerdomain never again hits retention, and I tracked it down to this.

I'll send a separate patch to fix this shortly.

Kevin 

Re: [PATCH 07/11] I2C: OMAP: Handle error check for pm runtime

[Shubhrajyoti Datta]

On Wed, Jun 27, 2012 at 7:13 AM, Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org> wrote:
> Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org> writes:
>
>> If PM runtime get_sync fails return with the error
>> so that no further reads/writes goes through the interface.
>> This will avoid possible abort. Add a error message in case
>> of failure with the cause of the failure.
>>
>> Reviewed-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
>> Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
>
> This patch introduced a regression where the runtime PM usecount will
> never reach zero and so CORE retention is prevented after any xfer
> failures...
>
>> ---
>> -v10 Use IS_ERR_VALUE
>> -v9 Fix the error handling
>>
>>  drivers/i2c/busses/i2c-omap.c |   14 +++++++++++---
>>  1 files changed, 11 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
>> index 44e8cfa..c39b72f 100644
>> --- a/drivers/i2c/busses/i2c-omap.c
>> +++ b/drivers/i2c/busses/i2c-omap.c
>> @@ -585,7 +585,9 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
>>       int i;
>>       int r;
>>
>> -     pm_runtime_get_sync(dev->dev);
>> +     r = pm_runtime_get_sync(dev->dev);<
>> +     if (IS_ERR_VALUE(r))
>> +             return r;
>
> This return should be 'goto out' so the runtime PM usecount is
> decremented by the 'put'.  Otherwise, after failure, the usecount
> remains non-zero, so the device is considered 'active' and keeps the
> containing power domain active.
>
> I found this on a 3730/OveroSTORM where the suspend/resume of MMC fails
> because I2C is already suspended.  After the suspend though, the CORE
> powerdomain never again hits retention, and I tracked it down to this.
>
> I'll send a separate patch to fix this shortly.

Thanks,
>
> Kevin
> --
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> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

[PATCHv10 09/11] I2C: OMAP: Do not set the XUDF(Transmit underflow) if the underflow is not reached

[Shubhrajyoti D]

Currently in the 1.153 errata handling, while waiting for transmitter
underflow, if NACK is got the XUDF(Transmit underflow) flag is also set.
Fix this by setting the XUDF(Transmit underflow) flag after wait for the
condition is over.

Cc: Alexander Shishkin <virtuoso-0lOfPCoBze7YtjvyW6yDsg@public.gmane.org>
Acked-by: Moiz Sonasath <m-sonasath-l0cyMroinI0@public.gmane.org>
Reviewed-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
---
-v10 Change the punctuation and reword.
-v9 XUDF is expanded to transmit underflow

 drivers/i2c/busses/i2c-omap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 6129cb8..cd6feea 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -730,7 +730,6 @@ static int errata_omap3_1p153(struct omap_i2c_dev *dev, u16 *stat, int *err)
 		if (*stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) {
 			omap_i2c_ack_stat(dev, *stat & (OMAP_I2C_STAT_XRDY |
 							OMAP_I2C_STAT_XDR));
-			*err |= OMAP_I2C_STAT_XUDF;
 			return -ETIMEDOUT;
 		}
 
@@ -743,6 +742,7 @@ static int errata_omap3_1p153(struct omap_i2c_dev *dev, u16 *stat, int *err)
 		return 0;
 	}
 
+	*err |= OMAP_I2C_STAT_XUDF;
 	return 0;
 }
 
-- 
1.7.5.4

[PATCHv10 10/11] I2C: OMAP: Rename the 1p153 to the erratum id i462

[Shubhrajyoti D]

The section number in the recent errata document has changed.
Rename the erratum 1p153 to the unique id i462 instead, so that
it is easier to reference. Also change the function name and comments
to reflect the same.

Cc: Jon Hunter <jon-hunter-l0cyMroinI0@public.gmane.org>
Reviewed-by: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>
Signed-off-by: Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>
---
 drivers/i2c/busses/i2c-omap.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index cd6feea..dc3bd40 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -173,7 +173,7 @@ enum {
 
 /* Errata definitions */
 #define I2C_OMAP_ERRATA_I207		(1 << 0)
-#define I2C_OMAP3_1P153			(1 << 1)
+#define I2C_OMAP_ERRATA_I462		(1 << 1)
 
 struct omap_i2c_dev {
 	struct device		*dev;
@@ -718,11 +718,11 @@ omap_i2c_omap1_isr(int this_irq, void *dev_id)
 #endif
 
 /*
- * OMAP3430 Errata 1.153: When an XRDY/XDR is hit, wait for XUDF before writing
+ * OMAP3430 Errata i462: When an XRDY/XDR is hit, wait for XUDF before writing
  * data to DATA_REG. Otherwise some data bytes can be lost while transferring
  * them from the memory to the I2C interface.
  */
-static int errata_omap3_1p153(struct omap_i2c_dev *dev, u16 *stat, int *err)
+static int errata_omap3_i462(struct omap_i2c_dev *dev, u16 *stat, int *err)
 {
 	unsigned long timeout = 10000;
 
@@ -881,8 +881,8 @@ complete:
 					break;
 				}
 
-				if ((dev->errata & I2C_OMAP3_1P153) &&
-				    errata_omap3_1p153(dev, &stat, &err))
+				if ((dev->errata & I2C_OMAP_ERRATA_I462) &&
+				    errata_omap3_i462(dev, &stat, &err))
 					goto complete;
 
 				omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
@@ -1020,7 +1020,7 @@ omap_i2c_probe(struct platform_device *pdev)
 		dev->errata |= I2C_OMAP_ERRATA_I207;
 
 	if (dev->rev <= OMAP_I2C_REV_ON_3430)
-		dev->errata |= I2C_OMAP3_1P153;
+		dev->errata |= I2C_OMAP_ERRATA_I462;
 
 	if (!(dev->flags & OMAP_I2C_FLAG_NO_FIFO)) {
 		u16 s;
-- 
1.7.5.4

[PATCHv10 11/11] OMAP/I2C - Fix timeout problem during suspend.

[Shubhrajyoti D]

From: Neil Brown <neilb@suse.de>

On a board with OMAP3 processor and TWL4030 Power management,
we need to talk to the TWL4030 during late suspend but cannot
because the I2C interrupt is disabled (as late suspend disables
interrupt).

e.g. I get messages like:

[   62.161102] musb-omap2430 musb-omap2430: LATE power domain suspend
[   63.167205] omap_i2c omap_i2c.1: controller timed out
[   63.183044] twl: i2c_read failed to transfer all messages
[   64.182861] omap_i2c omap_i2c.1: controller timed out
[   64.198455] twl: i2c_write failed to transfer all messages
[   65.198455] omap_i2c omap_i2c.1: controller timed out
[   65.203765] twl: i2c_write failed to transfer all messages

The stack shows omap2430_runtime_suspend calling twl4030_set_suspend
which tries to power-down the USB PHY (twl4030_phy_suspend ->
twl4030_phy_power -> __twl4030_phy_power which as a nice WARN_ON
that helps).

Then we get the same in resume:

[   69.603912] musb-omap2430 musb-omap2430: EARLY power domain resume
[   70.610473] omap_i2c omap_i2c.1: controller timed out
[   70.626129] twl: i2c_write failed to transfer all messages
etc.

So don't disable interrupts for I2C.

Acked-by: Kevin Hilman <khilman@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
---
 drivers/i2c/busses/i2c-omap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index dc3bd40..9895fa7 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1053,7 +1053,7 @@ omap_i2c_probe(struct platform_device *pdev)
 
 	isr = (dev->rev < OMAP_I2C_OMAP1_REV_2) ? omap_i2c_omap1_isr :
 								   omap_i2c_isr;
-	r = request_irq(dev->irq, isr, 0, pdev->name, dev);
+	r = request_irq(dev->irq, isr, IRQF_NO_SUSPEND, pdev->name, dev);
 
 	if (r) {
 		dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
-- 
1.7.5.4

Re: [PATCHv10 00/11] I2C fixes

[Kevin Hilman]

Shubhrajyoti D <shubhrajyoti@ti.com> writes:

> The patch series does the following
>
> - Warn fixes if CONFIG_PM_RUNTIME is not selected.
> - In case of i2c remove register access was done without any
>  get_sync fix the same.
> - Folds a patch from Tasslehoff to prevent any merge conflicts.
> - Prevents the XDUF flag to be set if the underflow condition is not met.
> - As per discussion in [1] .Adds a patch to rename the 1p153 errata and
>  use the unique id instead as the section number in the recent errata
>  docs has changed.
>
> v9:
> Fix the comments from Wolfram Sang
>
> v10:
> Add a patch from Neil to the series.
> Fix kevin comments
> update the patches with comments.

Shubhrajyoti, thanks for the updates.

Wolfgang, with these updates and testing a bit better described, I'm OK
with you merging it.  Merging it now will give it plenty of time to
bake in linux-next and get more test exposure.

Thanks,

Kevin


> [1] http://www.spinics.net/lists/linux-i2c/msg07607.html
>
> Tested on omap4sdp and omap3sdp.
> - Did functional tests read write on both the platforms.
> - Off mode and retention on OMAP3
> - On OMAP4 just did echo mem > /sys/power/state and wakeup.
> Did see.
> [ 1360.595855] Successfully put all powerdomains to target state
> However didnt see the ret count for other than mpu_pwrdm increase.
> I think power support for omap4 is minimal. 
>
> The following changes since commit b48b2c3e50433ff6f7e46186daa7f986bd960215:
>
>   openrisc: use generic strnlen_user() function (2012-05-27 21:00:32 -0700)
>
> are available in the git repository at:
>   git://gitorious.org/linus-tree/linus-tree.git i2c_omap-fixes
>
> Neil Brown (1):
>       OMAP/I2C - Fix timeout problem during suspend.
>
> Shubhrajyoti D (9):
>       I2C: OMAP: make omap_i2c_unidle/idle functions depend on CONFIG_PM_RUNTIME
>       I2C: OMAP: Fix the mismatch of pm_runtime enable and disable
>       I2C: OMAP: Fix the interrupt clearing in OMAP4
>       I2C: OMAP: Prevent the register access after pm_runtime_put in probe
>       I2C: OMAP: Don't check if wait_for_completion_timeout() returns less than zero
>       I2C: OMAP: Fix the crash in i2c remove
>       I2C: OMAP: Handle error check for pm runtime
>       I2C: OMAP: Do not set the XUDF(Transmit underflow) if the underflow is not reached
>       I2C: OMAP: Rename the 1p153 to the erratum id i462
>
> Tasslehoff Kjappfot (1):
>       I2C: OMAP: prevent the overwrite of the errata flags
>
>  drivers/i2c/busses/i2c-omap.c |  129 ++++++++++++++++++++---------------------
>  1 files changed, 63 insertions(+), 66 deletions(-)

Re: [PATCHv10 00/11] I2C fixes

[Shubhrajyoti Datta]

On Fri, Jun 1, 2012 at 4:29 AM, Kevin Hilman <khilman@ti.com> wrote:
> Shubhrajyoti D <shubhrajyoti@ti.com> writes:
>
>> The patch series does the following
>>
>> - Warn fixes if CONFIG_PM_RUNTIME is not selected.
>> - In case of i2c remove register access was done without any
>>  get_sync fix the same.
>> - Folds a patch from Tasslehoff to prevent any merge conflicts.
>> - Prevents the XDUF flag to be set if the underflow condition is not met.
>> - As per discussion in [1] .Adds a patch to rename the 1p153 errata and
>>  use the unique id instead as the section number in the recent errata
>>  docs has changed.
>>
>> v9:
>> Fix the comments from Wolfram Sang
>>
>> v10:
>> Add a patch from Neil to the series.
>> Fix kevin comments
>> update the patches with comments.
>
> Shubhrajyoti, thanks for the updates.
>
> Wolfgang, with these updates and testing a bit better described, I'm OK
> with you merging it.  Merging it now will give it plenty of time to
> bake in linux-next and get more test exposure.

Agree,
These are only fixes can it be considered for rc3?

Thanks and Regards,
Shubhrajyoti
>
> Thanks,
>
> Kevin
>
>
>> [1] http://www.spinics.net/lists/linux-i2c/msg07607.html
>>
>> Tested on omap4sdp and omap3sdp.
>> - Did functional tests read write on both the platforms.
>> - Off mode and retention on OMAP3
>> - On OMAP4 just did echo mem > /sys/power/state and wakeup.
>> Did see.
>> [ 1360.595855] Successfully put all powerdomains to target state
>> However didnt see the ret count for other than mpu_pwrdm increase.
>> I think power support for omap4 is minimal.
>>
>> The following changes since commit b48b2c3e50433ff6f7e46186daa7f986bd960215:
>>
>>   openrisc: use generic strnlen_user() function (2012-05-27 21:00:32 -0700)
>>
>> are available in the git repository at:
>>   git://gitorious.org/linus-tree/linus-tree.git i2c_omap-fixes
>>
>> Neil Brown (1):
>>       OMAP/I2C - Fix timeout problem during suspend.
>>
>> Shubhrajyoti D (9):
>>       I2C: OMAP: make omap_i2c_unidle/idle functions depend on CONFIG_PM_RUNTIME
>>       I2C: OMAP: Fix the mismatch of pm_runtime enable and disable
>>       I2C: OMAP: Fix the interrupt clearing in OMAP4
>>       I2C: OMAP: Prevent the register access after pm_runtime_put in probe
>>       I2C: OMAP: Don't check if wait_for_completion_timeout() returns less than zero
>>       I2C: OMAP: Fix the crash in i2c remove
>>       I2C: OMAP: Handle error check for pm runtime
>>       I2C: OMAP: Do not set the XUDF(Transmit underflow) if the underflow is not reached
>>       I2C: OMAP: Rename the 1p153 to the erratum id i462
>>
>> Tasslehoff Kjappfot (1):
>>       I2C: OMAP: prevent the overwrite of the errata flags
>>
>>  drivers/i2c/busses/i2c-omap.c |  129 ++++++++++++++++++++---------------------
>>  1 files changed, 63 insertions(+), 66 deletions(-)
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Re: [PATCHv10 00/11] I2C fixes

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 1743 bytes --]

On Sun, Jun 10, 2012 at 11:10:47AM +0530, Shubhrajyoti Datta wrote:
> On Fri, Jun 1, 2012 at 4:29 AM, Kevin Hilman <khilman@ti.com> wrote:
> > Shubhrajyoti D <shubhrajyoti@ti.com> writes:
> >
> >> The patch series does the following
> >>
> >> - Warn fixes if CONFIG_PM_RUNTIME is not selected.
> >> - In case of i2c remove register access was done without any
> >>  get_sync fix the same.
> >> - Folds a patch from Tasslehoff to prevent any merge conflicts.
> >> - Prevents the XDUF flag to be set if the underflow condition is not met.
> >> - As per discussion in [1] .Adds a patch to rename the 1p153 errata and
> >>  use the unique id instead as the section number in the recent errata
> >>  docs has changed.
> >>
> >> v9:
> >> Fix the comments from Wolfram Sang
> >>
> >> v10:
> >> Add a patch from Neil to the series.
> >> Fix kevin comments
> >> update the patches with comments.
> >
> > Shubhrajyoti, thanks for the updates.
> >
> > Wolfgang, with these updates and testing a bit better described, I'm OK
> > with you merging it.  Merging it now will give it plenty of time to
> > bake in linux-next and get more test exposure.
> 
> Agree,
> These are only fixes can it be considered for rc3?

"Baking in linux-next" and "considering rc3" don't match; baking needs
time, rc3 is soon. I've put the patches now into my -next branch for
more exposure. I am still uncertain if they should be in 3.5 already;
there seem to be worhty fixes in there, but they do depend on stuff
which don't really qualify as bugfixes...

Thanks,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCHv10 00/11] I2C fixes

[Shubhrajyoti]

On Monday 11 June 2012 09:30 PM, Wolfram Sang wrote:
>> Agree,
>> > These are only fixes can it be considered for rc3?
> "Baking in linux-next" and "considering rc3" don't match; baking needs
> time, rc3 is soon. I've put the patches now into my -next branch for
> more exposure.
Thanks.
>  I am still uncertain if they should be in 3.5 already;
> there seem to be worhty fixes in there, but they do depend on stuff
> which don't really qualify as bugfixes...