[PATCH v4 0/2] ata: ahci_brcm: Follow-up changes for BCM7216

[PATCH v4 0/2] ata: ahci_brcm: Follow-up changes for BCM7216

[Florian Fainelli]

Hi Jens,

These three patches are a follow-up to my previous series titled: ata:
ahci_brcm: Fixes and new device support.

After submitting the BCM7216 RESCAL reset driver, Philipp the reset
controller maintained indicated that the reset line should be self
de-asserting and so reset_control_reset() should be used instead.

These three patches update the driver in that regard. It would be great if
you could apply those and get them queued up for 5.6 since they are
directly related to the previous series.

Changes in v4:

- rebase against latest ata/for-next which included some fixes from
  Arnd that corrected the reset consumer API
- dropped patch #1
- did not add Reviewed-by tags since the patches changed a bit from last
  submission

Changes in v3:
- introduced a preliminary patch making use of the proper reset control
  API in order to manage the optional reset controller line
- updated patches after introducing that preliminary patch

Changes in v2:
- updated error path after moving the reset line control

Thanks!

Florian Fainelli (2):
  ata: ahci_brcm: Perform reset after obtaining resources
  ata: ahci_brcm: BCM7216 reset is self de-asserting

 drivers/ata/ahci_brcm.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

-- 
2.17.1

[PATCH v4 1/2] ata: ahci_brcm: Perform reset after obtaining resources

[Florian Fainelli]

Resources such as clocks, PHYs, regulators are likely to get a probe
deferral return code, which could lead to the AHCI controller being
reset a few times until it gets successfully probed. Since this is
typically the most time consuming operation, move it after the resources
have been acquired.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/ata/ahci_brcm.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
index 7ac1141c6ad0..e32c8fe729ff 100644
--- a/drivers/ata/ahci_brcm.c
+++ b/drivers/ata/ahci_brcm.c
@@ -456,13 +456,9 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->rcdev))
 		return PTR_ERR(priv->rcdev);
 
-	reset_control_deassert(priv->rcdev);
-
 	hpriv = ahci_platform_get_resources(pdev, 0);
-	if (IS_ERR(hpriv)) {
-		ret = PTR_ERR(hpriv);
-		goto out_reset;
-	}
+	if (IS_ERR(hpriv))
+		return PTR_ERR(hpriv);
 
 	hpriv->plat_data = priv;
 	hpriv->flags = AHCI_HFLAG_WAKE_BEFORE_STOP | AHCI_HFLAG_NO_WRITE_TO_RO;
@@ -479,6 +475,10 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 		break;
 	}
 
+	ret = reset_control_deassert(priv->rcdev);
+	if (ret)
+		return ret;
+
 	ret = ahci_platform_enable_clks(hpriv);
 	if (ret)
 		goto out_reset;
-- 
2.17.1

[PATCH v4 2/2] ata: ahci_brcm: BCM7216 reset is self de-asserting

[Florian Fainelli]

The BCM7216 reset controller line is self-deasserting, unlike other
platforms, so make use of reset_control_reset() instead of
reset_control_deassert().

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/ata/ahci_brcm.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
index e32c8fe729ff..6853dbb4131d 100644
--- a/drivers/ata/ahci_brcm.c
+++ b/drivers/ata/ahci_brcm.c
@@ -352,7 +352,8 @@ static int brcm_ahci_suspend(struct device *dev)
 	else
 		ret = 0;
 
-	reset_control_assert(priv->rcdev);
+	if (priv->version != BRCM_SATA_BCM7216)
+		reset_control_assert(priv->rcdev);
 
 	return ret;
 }
@@ -364,7 +365,10 @@ static int __maybe_unused brcm_ahci_resume(struct device *dev)
 	struct brcm_ahci_priv *priv = hpriv->plat_data;
 	int ret = 0;
 
-	ret = reset_control_deassert(priv->rcdev);
+	if (priv->version == BRCM_SATA_BCM7216)
+		ret = reset_control_reset(priv->rcdev);
+	else
+		ret = reset_control_deassert(priv->rcdev);
 	if (ret)
 		return ret;
 
@@ -475,7 +479,10 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 		break;
 	}
 
-	ret = reset_control_deassert(priv->rcdev);
+	if (priv->version == BRCM_SATA_BCM7216)
+		ret = reset_control_reset(priv->rcdev);
+	else
+		ret = reset_control_deassert(priv->rcdev);
 	if (ret)
 		return ret;
 
@@ -520,7 +527,8 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 out_disable_clks:
 	ahci_platform_disable_clks(hpriv);
 out_reset:
-	reset_control_assert(priv->rcdev);
+	if (priv->version != BRCM_SATA_BCM7216)
+		reset_control_assert(priv->rcdev);
 	return ret;
 }
 
-- 
2.17.1

Re: [PATCH v4 0/2] ata: ahci_brcm: Follow-up changes for BCM7216

[Jens Axboe]

On 1/17/20 4:53 PM, Florian Fainelli wrote:
> Hi Jens,
> 
> These three patches are a follow-up to my previous series titled: ata:
> ahci_brcm: Fixes and new device support.
> 
> After submitting the BCM7216 RESCAL reset driver, Philipp the reset
> controller maintained indicated that the reset line should be self
> de-asserting and so reset_control_reset() should be used instead.
> 
> These three patches update the driver in that regard. It would be great if
> you could apply those and get them queued up for 5.6 since they are
> directly related to the previous series.

Thanks, applied.

-- 
Jens Axboe