On Thu, Feb 23, 2017 at 05:34:49PM +0100, Bastian Stender wrote:
> As stated in Marvell's Functional Specifications in MV-S107021-U0 Rev. A
> on page 420 ff. software delays are needed. "SW delay represent a delay
> of at least 2 internal clock cycles". These delays are hereby
> implemented.
>
> The original kernel driver compensates the needed software delays with
> the time the interrupts take.
>
> Signed-off-by: Bastian Stender <bst@xxxxxxxxxxxxxx>
Applied, thanks
Sascha
> ---
> drivers/i2c/busses/i2c-mv64xxx.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
> index 9b9e6c953f..45d5a2b6dc 100644
> --- a/drivers/i2c/busses/i2c-mv64xxx.c
> +++ b/drivers/i2c/busses/i2c-mv64xxx.c
> @@ -270,6 +270,7 @@ mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
> }
> /* FALLTHRU */
> case STATUS_MAST_RD_DATA_ACK: /* 0x50 */
> + udelay(2);
> if (status != STATUS_MAST_RD_DATA_ACK)
> drv_data->action = ACTION_CONTINUE;
> else {
> @@ -280,6 +281,7 @@ mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
>
> if (drv_data->bytes_left == 1)
> drv_data->cntl_bits &= ~REG_CONTROL_ACK;
> + udelay(2);
> break;
>
> case STATUS_MAST_RD_DATA_NO_ACK: /* 0x58 */
> @@ -318,6 +320,8 @@ static void mv64xxx_i2c_send_start(struct mv64xxx_i2c_data *drv_data)
> mv64xxx_i2c_prepare_for_io(drv_data, drv_data->msgs);
> mv64xxx_write(drv_data, drv_data->cntl_bits | REG_CONTROL_START,
> drv_data->reg_offsets.control);
> +
> + udelay(2);
> }
>
> static void
> @@ -333,7 +337,7 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
> mv64xxx_i2c_send_start(drv_data);
>
> if (drv_data->errata_delay)
> - udelay(5);
> + udelay(3);
>
> /*
> * We're never at the start of the message here, and by this
> @@ -349,6 +353,7 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
> break;
>
> case ACTION_SEND_ADDR_1:
> + udelay(2);
> mv64xxx_write(drv_data, drv_data->addr1,
> drv_data->reg_offsets.data);
> mv64xxx_write(drv_data, drv_data->cntl_bits,
> @@ -360,9 +365,11 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
> drv_data->reg_offsets.data);
> mv64xxx_write(drv_data, drv_data->cntl_bits,
> drv_data->reg_offsets.control);
> + udelay(2);
> break;
>
> case ACTION_SEND_DATA:
> + udelay(2);
> mv64xxx_write(drv_data, drv_data->msg->buf[drv_data->byte_posn++],
> drv_data->reg_offsets.data);
> mv64xxx_write(drv_data, drv_data->cntl_bits,
> @@ -383,8 +390,9 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
> mv64xxx_write(drv_data, drv_data->cntl_bits | REG_CONTROL_STOP,
> drv_data->reg_offsets.control);
> drv_data->block = false;
> + udelay(2);
> if (drv_data->errata_delay)
> - udelay(5);
> + udelay(3);
>
> break;
>
> --
> 2.11.0
>
>
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