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Date: Thu, 23 Aug 2018 18:01:10 +0100
From: John Garry <john.garry@...wei.com>
To: Ding Xiang <dingxiang@...s.chinamobile.com>,
<jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>,
<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Linuxarm <linuxarm@...wei.com>,
chenxiang <chenxiang66@...ilicon.com>
Subject: Re: [PATCH] scsi: hisi_sas: Switch from msleep to usleep_range per
timers-howto.txt
On 23/08/2018 12:08, Ding Xiang wrote:
> use usleep_range to sleep for 10us - 20ms
>
Hi,
Thanks for the patch.
According to the document, msleep(1) will be ~20ms. As such, some driver
behaviour may depend on this now.
At this stage, the drivers have been extensively tested (v2+v3), so I
would rather not introduce possible instability. In addition, v1 is all
but dead, so I can't test. Finally, none of the sleeps are in the
fastpath, so the extra sleep does not cause much harm.
John
> Signed-off-by: Ding Xiang <dingxiang@...s.chinamobile.com>
> ---
> drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 8 ++++----
> drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 6 +++---
> drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 2 +-
> 3 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> index 8f60f0e..0584f711 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
> @@ -579,7 +579,7 @@ static int reset_hw_v1_hw(struct hisi_hba *hisi_hba)
> phy_ctrl |= PHY_CTRL_RESET_MSK;
> hisi_sas_phy_write32(hisi_hba, i, PHY_CTRL, phy_ctrl);
> }
> - msleep(1); /* It is safe to wait for 50us */
> + usleep_range(1000, 1100); /* It is safe to wait for 50us */
>
> /* Ensure DMA tx & rx idle */
> for (i = 0; i < hisi_hba->n_phy; i++) {
> @@ -632,7 +632,7 @@ static int reset_hw_v1_hw(struct hisi_hba *hisi_hba)
> RESET_VALUE);
> regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_clock_ena_reg + 4,
> RESET_VALUE);
> - msleep(1);
> + usleep_range(1000, 1100);
> regmap_read(hisi_hba->ctrl, hisi_hba->ctrl_reset_sts_reg, &val);
> if (RESET_VALUE != (val & RESET_VALUE)) {
> dev_err(dev, "Reset failed\n");
> @@ -645,7 +645,7 @@ static int reset_hw_v1_hw(struct hisi_hba *hisi_hba)
> RESET_VALUE);
> regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_clock_ena_reg,
> RESET_VALUE);
> - msleep(1);
> + usleep_range(1000, 1100);
> regmap_read(hisi_hba->ctrl, hisi_hba->ctrl_reset_sts_reg, &val);
> if (val & RESET_VALUE) {
> dev_err(dev, "De-reset failed\n");
> @@ -841,7 +841,7 @@ static void sl_notify_v1_hw(struct hisi_hba *hisi_hba, int phy_no)
> sl_control = hisi_sas_phy_read32(hisi_hba, phy_no, SL_CONTROL);
> sl_control |= SL_CONTROL_NOTIFY_EN_MSK;
> hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL, sl_control);
> - msleep(1);
> + usleep_range(1000, 1100);
> sl_control = hisi_sas_phy_read32(hisi_hba, phy_no, SL_CONTROL);
> sl_control &= ~SL_CONTROL_NOTIFY_EN_MSK;
> hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL, sl_control);
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> index 9c5c5a6..4ca5f77 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> @@ -1081,7 +1081,7 @@ static int reset_hw_v2_hw(struct hisi_hba *hisi_hba)
> reset_val);
> regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_clock_ena_reg + 4,
> reset_val);
> - msleep(1);
> + usleep_range(1000, 1100);
> regmap_read(hisi_hba->ctrl, hisi_hba->ctrl_reset_sts_reg, &val);
> if (reset_val != (val & reset_val)) {
> dev_err(dev, "SAS reset fail.\n");
> @@ -1093,7 +1093,7 @@ static int reset_hw_v2_hw(struct hisi_hba *hisi_hba)
> reset_val);
> regmap_write(hisi_hba->ctrl, hisi_hba->ctrl_clock_ena_reg,
> reset_val);
> - msleep(1);
> + usleep_range(1000, 1100);
> regmap_read(hisi_hba->ctrl, hisi_hba->ctrl_reset_sts_reg,
> &val);
> if (val & reset_val) {
> @@ -1591,7 +1591,7 @@ static void sl_notify_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
> sl_control = hisi_sas_phy_read32(hisi_hba, phy_no, SL_CONTROL);
> sl_control |= SL_CONTROL_NOTIFY_EN_MSK;
> hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL, sl_control);
> - msleep(1);
> + usleep_range(1000, 1100);
> sl_control = hisi_sas_phy_read32(hisi_hba, phy_no, SL_CONTROL);
> sl_control &= ~SL_CONTROL_NOTIFY_EN_MSK;
> hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL, sl_control);
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> index 08b503e2..8f57737 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> @@ -834,7 +834,7 @@ static void sl_notify_v3_hw(struct hisi_hba *hisi_hba, int phy_no)
> sl_control = hisi_sas_phy_read32(hisi_hba, phy_no, SL_CONTROL);
> sl_control |= SL_CONTROL_NOTIFY_EN_MSK;
> hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL, sl_control);
> - msleep(1);
> + usleep_range(1000, 1100);
> sl_control = hisi_sas_phy_read32(hisi_hba, phy_no, SL_CONTROL);
> sl_control &= ~SL_CONTROL_NOTIFY_EN_MSK;
> hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL, sl_control);
>
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