On Wed, Oct 28, 2015 at 9:48 PM, Sören Brinkmann
<soren.brinkm...@xilinx.com> wrote:
> Hi Shubhrajyoti,
>
>
> On Wed, 2015-10-28 at 12:56PM +0530, Shubhrajyoti Datta wrote:
>> Currently the clocks are enabled at probe and disabled at remove.
>> Which keeps the clocks enabled even if no transaction is going on.
>> This patch enables the clocks at the start of transfer and disables
>> after it.
>>
>> Also adapts to runtime pm.
>> Remove xi2c->suspended and use pm runtime status instead.
>>
>> converts dev pm to const to silence a checkpatch warning.
>>
>> Signed-off-by: Shubhrajyoti Datta <shubh...@xilinx.com>
>
> To me, this looks all good. Just one small concern below.
Thanks for the review.
>
>> ---
>> changes since v2
>> update the cc list
>>
>> drivers/i2c/busses/i2c-cadence.c | 73
>> ++++++++++++++++++++++++--------------
>> 1 files changed, 46 insertions(+), 27 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-cadence.c
>> b/drivers/i2c/busses/i2c-cadence.c
>> index 84deed6..6b08d16 100644
>> --- a/drivers/i2c/busses/i2c-cadence.c
>> +++ b/drivers/i2c/busses/i2c-cadence.c
>> @@ -18,6 +18,7 @@
>> #include <linux/module.h>
>> #include <linux/platform_device.h>
>> #include <linux/of.h>
>> +#include <linux/pm_runtime.h>
>>
>> /* Register offsets for the I2C device. */
>> #define CDNS_I2C_CR_OFFSET 0x00 /* Control Register, RW */
>> @@ -96,6 +97,8 @@
>> CDNS_I2C_IXR_COMP)
>>
>> #define CDNS_I2C_TIMEOUT msecs_to_jiffies(1000)
>> +/* timeout for pm runtime autosuspend */
>> +#define CNDS_I2C_PM_TIMEOUT 1000 /* ms */
>>
>> #define CDNS_I2C_FIFO_DEPTH 16
>> /* FIFO depth at which the DATA interrupt occurs */
>> @@ -128,7 +131,6 @@
>> * @xfer_done: Transfer complete status
>> * @p_send_buf: Pointer to transmit buffer
>> * @p_recv_buf: Pointer to receive buffer
>> - * @suspended: Flag holding the device's PM status
>> * @send_count: Number of bytes still expected to send
>> * @recv_count: Number of bytes still expected to receive
>> * @curr_recv_count: Number of bytes to be received in current transfer
>> @@ -141,6 +143,7 @@
>> * @quirks: flag for broken hold bit usage in r1p10
>> */
>> struct cdns_i2c {
>> + struct device *dev;
>> void __iomem *membase;
>> struct i2c_adapter adap;
>> struct i2c_msg *p_msg;
>> @@ -148,7 +151,6 @@ struct cdns_i2c {
>> struct completion xfer_done;
>> unsigned char *p_send_buf;
>> unsigned char *p_recv_buf;
>> - u8 suspended;
>
> There might have been a reason to store this flag here. Did you test
> this with lockdep and CONFIG_DEBUG_ATOMIC_SLEEP? Just to make sure that
> nothing that can sleep is called from atomic context.
Done now.
Essentially this is a flag is set in suspend routine. and checked in
the isr I use
pm_runtime_suspended(id->dev) instead.
>
> Sören
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majord...@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
