2015-10-30 15:53 GMT+01:00 Benjamin Rood <benjaminjr...@gmail.com>:
> The documentation for the 8070 and 8072 SPCv chip explicitly states that
> a minimum of 500ms must elapse before issuing commands, otherwise the
> SPCv may not process them and the firmware may get into an unrecoverable
> state requiring a reboot. While the Linux guys will probably think this
> is 'racy', it is called out in the chip documentation and inserting this
> delay makes power management function properly.
>
> Signed-off-by: Benjamin Rood <br...@attotech.com>
> ---
> drivers/scsi/pm8001/pm8001_init.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/scsi/pm8001/pm8001_init.c
> b/drivers/scsi/pm8001/pm8001_init.c
> index a0e55d4..ab99984 100644
> --- a/drivers/scsi/pm8001/pm8001_init.c
> +++ b/drivers/scsi/pm8001/pm8001_init.c
> @@ -1190,6 +1190,7 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
> int rc;
> u8 i = 0, j;
> u32 device_state;
> + u32 wait_count;
> DECLARE_COMPLETION_ONSTACK(completion);
> pm8001_ha = sha->lldd_ha;
> device_state = pdev->current_state;
> @@ -1243,6 +1244,17 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
> for (i = 1; i < pm8001_ha->number_of_intr; i++)
> PM8001_CHIP_DISP->interrupt_enable(pm8001_ha, i);
> }
> +
> + if (pm8001_ha->chip_id == chip_8070 ||
> + pm8001_ha->chip_id == chip_8072) {
> + wait_count = 500;
> + do {
> + mdelay(1);
> + } while (--wait_count);
> + }
> +
> + /* Spin up the PHYs */
> +
> pm8001_ha->flags = PM8001F_RUN_TIME;
> for (i = 0; i < pm8001_ha->chip->n_phy; i++) {
> pm8001_ha->phy[i].enable_completion = &completion;
> --
> 2.4.3
>
Could we simply mdelay(500) instead the loop?
Also better to add a comment around.
Thanks,
Jack
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