[PATCH v5 0/2] ata: ahci_brcm: Fix use of BCM7216 reset controller

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Revision v5 of 4 in this series.

9 messages, 3 authors, 2021-04-06 · open the first message on its own page

[PATCH v5 0/2] ata: ahci_brcm: Fix use of BCM7216 reset controller

From: Jim Quinlan <jim2101024@gmail.com>
Date: 2021-03-12 20:46:53

v5 -- Improved (I hope) commit description (Bjorn).
   -- Rnamed error labels (Krzyszt).
   -- Fixed typos.

v4 -- does not rely on a pending commit, unlike v3.

v3 -- discard commit from v2; instead rely on the new function
      reset_control_rearm provided in a recent commit [1] applied
      to reset/next.
   -- New commit to correct pcie-brcmstb.c usage of a reset controller
      to use reset/rearm verses deassert/assert.

v2 -- refactor rescal-reset driver to implement assert/deassert rather than
      reset because the reset call only fires once per lifetime and we need
      to reset after every resume from S2 or S3.
   -- Split the use of "ahci" and "rescal" controllers in separate fields
      to keep things simple.

v1 -- original

Jim Quinlan (2):
  ata: ahci_brcm: Fix use of BCM7216 reset controller
  PCI: brcmstb: Use reset/rearm instead of deassert/assert

 drivers/ata/ahci_brcm.c               | 46 +++++++++++++--------------
 drivers/pci/controller/pcie-brcmstb.c | 19 +++++++----
 2 files changed, 36 insertions(+), 29 deletions(-)

-- 
2.17.1


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[PATCH v5 2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert

From: Jim Quinlan <jim2101024@gmail.com>
Date: 2021-03-12 20:47:25

The Broadcom STB PCIe RC uses a reset control "rescal" for certain chips.
The "rescal" implements a "pulse reset" so using assert/deassert is wrong
for this device.  Instead, we use reset/rearm.  We need to use rearm so
that we can reset it after a suspend/resume cycle; w/o using "rearm", the
"rescal" device will only ever fire once.

Of course for suspend/resume to work we also need to put the reset/rearm
calls in the suspend and resume routines.

Fixes: 740d6c3708a9 ("PCI: brcmstb: Add control of rescal reset")
Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/pci/controller/pcie-brcmstb.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index e330e6811f0b..3b35d629035e 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c

@@ -1148,6 +1148,7 @@ static int brcm_pcie_suspend(struct device *dev)
 
 	brcm_pcie_turn_off(pcie);
 	ret = brcm_phy_stop(pcie);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 
 	return ret;

@@ -1163,9 +1164,13 @@ static int brcm_pcie_resume(struct device *dev)
 	base = pcie->base;
 	clk_prepare_enable(pcie->clk);
 
+	ret = reset_control_reset(pcie->rescal);
+	if (ret)
+		goto err_disable_clk;
+
 	ret = brcm_phy_start(pcie);
 	if (ret)
-		goto err;
+		goto err_reset;
 
 	/* Take bridge out of reset so we can access the SERDES reg */
 	pcie->bridge_sw_init_set(pcie, 0);

@@ -1180,14 +1185,16 @@ static int brcm_pcie_resume(struct device *dev)
 
 	ret = brcm_pcie_setup(pcie);
 	if (ret)
-		goto err;
+		goto err_reset;
 
 	if (pcie->msi)
 		brcm_msi_set_regs(pcie->msi);
 
 	return 0;
 
-err:
+err_reset:
+	reset_control_rearm(pcie->rescal);
+err_disable_clk:
 	clk_disable_unprepare(pcie->clk);
 	return ret;
 }

@@ -1197,7 +1204,7 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
 	brcm_msi_remove(pcie);
 	brcm_pcie_turn_off(pcie);
 	brcm_phy_stop(pcie);
-	reset_control_assert(pcie->rescal);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 }

@@ -1278,13 +1285,13 @@ static int brcm_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(pcie->perst_reset);
 	}
 
-	ret = reset_control_deassert(pcie->rescal);
+	ret = reset_control_reset(pcie->rescal);
 	if (ret)
 		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
 
 	ret = brcm_phy_start(pcie);
 	if (ret) {
-		reset_control_assert(pcie->rescal);
+		reset_control_rearm(pcie->rescal);
 		clk_disable_unprepare(pcie->clk);
 		return ret;
 	}

-- 
2.17.1


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Re: [PATCH v5 2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert

From: Lorenzo Pieralisi <hidden>
Date: 2021-03-29 16:06:47

On Fri, Mar 12, 2021 at 03:45:55PM -0500, Jim Quinlan wrote:

The Broadcom STB PCIe RC uses a reset control "rescal" for certain chips.
The "rescal" implements a "pulse reset" so using assert/deassert is wrong
for this device.  Instead, we use reset/rearm.  We need to use rearm so
that we can reset it after a suspend/resume cycle; w/o using "rearm", the
"rescal" device will only ever fire once.

Of course for suspend/resume to work we also need to put the reset/rearm
calls in the suspend and resume routines.

Fixes: 740d6c3708a9 ("PCI: brcmstb: Add control of rescal reset")
Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/pci/controller/pcie-brcmstb.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

Should I take this patch in the PCI queue ?

Thanks,
Lorenzo

quoted hunk

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index e330e6811f0b..3b35d629035e 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c

@@ -1148,6 +1148,7 @@ static int brcm_pcie_suspend(struct device *dev)
 
 	brcm_pcie_turn_off(pcie);
 	ret = brcm_phy_stop(pcie);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 
 	return ret;

@@ -1163,9 +1164,13 @@ static int brcm_pcie_resume(struct device *dev)
 	base = pcie->base;
 	clk_prepare_enable(pcie->clk);
 
+	ret = reset_control_reset(pcie->rescal);
+	if (ret)
+		goto err_disable_clk;
+
 	ret = brcm_phy_start(pcie);
 	if (ret)
-		goto err;
+		goto err_reset;
 
 	/* Take bridge out of reset so we can access the SERDES reg */
 	pcie->bridge_sw_init_set(pcie, 0);

@@ -1180,14 +1185,16 @@ static int brcm_pcie_resume(struct device *dev)
 
 	ret = brcm_pcie_setup(pcie);
 	if (ret)
-		goto err;
+		goto err_reset;
 
 	if (pcie->msi)
 		brcm_msi_set_regs(pcie->msi);
 
 	return 0;
 
-err:
+err_reset:
+	reset_control_rearm(pcie->rescal);
+err_disable_clk:
 	clk_disable_unprepare(pcie->clk);
 	return ret;
 }

@@ -1197,7 +1204,7 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
 	brcm_msi_remove(pcie);
 	brcm_pcie_turn_off(pcie);
 	brcm_phy_stop(pcie);
-	reset_control_assert(pcie->rescal);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 }

@@ -1278,13 +1285,13 @@ static int brcm_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(pcie->perst_reset);
 	}
 
-	ret = reset_control_deassert(pcie->rescal);
+	ret = reset_control_reset(pcie->rescal);
 	if (ret)
 		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
 
 	ret = brcm_phy_start(pcie);
 	if (ret) {
-		reset_control_assert(pcie->rescal);
+		reset_control_rearm(pcie->rescal);
 		clk_disable_unprepare(pcie->clk);
 		return ret;
 	}

-- 
2.17.1

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Re: [PATCH v5 2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert

From: Lorenzo Pieralisi <hidden>
Date: 2021-03-29 16:11:45

On Fri, Mar 12, 2021 at 03:45:55PM -0500, Jim Quinlan wrote:

The Broadcom STB PCIe RC uses a reset control "rescal" for certain chips.
The "rescal" implements a "pulse reset" so using assert/deassert is wrong
for this device.  Instead, we use reset/rearm.  We need to use rearm so
that we can reset it after a suspend/resume cycle; w/o using "rearm", the
"rescal" device will only ever fire once.

Of course for suspend/resume to work we also need to put the reset/rearm
calls in the suspend and resume routines.

Actually - I am sorry but it looks like you will have to split the patch
in two since this is two logical changes.

Thanks,
Lorenzo

quoted hunk

Fixes: 740d6c3708a9 ("PCI: brcmstb: Add control of rescal reset")
Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/pci/controller/pcie-brcmstb.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index e330e6811f0b..3b35d629035e 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c

@@ -1148,6 +1148,7 @@ static int brcm_pcie_suspend(struct device *dev)
 
 	brcm_pcie_turn_off(pcie);
 	ret = brcm_phy_stop(pcie);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 
 	return ret;

@@ -1163,9 +1164,13 @@ static int brcm_pcie_resume(struct device *dev)
 	base = pcie->base;
 	clk_prepare_enable(pcie->clk);
 
+	ret = reset_control_reset(pcie->rescal);
+	if (ret)
+		goto err_disable_clk;
+
 	ret = brcm_phy_start(pcie);
 	if (ret)
-		goto err;
+		goto err_reset;
 
 	/* Take bridge out of reset so we can access the SERDES reg */
 	pcie->bridge_sw_init_set(pcie, 0);

@@ -1180,14 +1185,16 @@ static int brcm_pcie_resume(struct device *dev)
 
 	ret = brcm_pcie_setup(pcie);
 	if (ret)
-		goto err;
+		goto err_reset;
 
 	if (pcie->msi)
 		brcm_msi_set_regs(pcie->msi);
 
 	return 0;
 
-err:
+err_reset:
+	reset_control_rearm(pcie->rescal);
+err_disable_clk:
 	clk_disable_unprepare(pcie->clk);
 	return ret;
 }

@@ -1197,7 +1204,7 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
 	brcm_msi_remove(pcie);
 	brcm_pcie_turn_off(pcie);
 	brcm_phy_stop(pcie);
-	reset_control_assert(pcie->rescal);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 }

@@ -1278,13 +1285,13 @@ static int brcm_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(pcie->perst_reset);
 	}
 
-	ret = reset_control_deassert(pcie->rescal);
+	ret = reset_control_reset(pcie->rescal);
 	if (ret)
 		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
 
 	ret = brcm_phy_start(pcie);
 	if (ret) {
-		reset_control_assert(pcie->rescal);
+		reset_control_rearm(pcie->rescal);
 		clk_disable_unprepare(pcie->clk);
 		return ret;
 	}

-- 
2.17.1

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Re: [PATCH v5 2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert

From: Florian Fainelli <f.fainelli@gmail.com>
Date: 2021-03-29 16:51:12

On 3/29/21 9:10 AM, Lorenzo Pieralisi wrote:

On Fri, Mar 12, 2021 at 03:45:55PM -0500, Jim Quinlan wrote:

quoted

The Broadcom STB PCIe RC uses a reset control "rescal" for certain chips.
The "rescal" implements a "pulse reset" so using assert/deassert is wrong
for this device.  Instead, we use reset/rearm.  We need to use rearm so
that we can reset it after a suspend/resume cycle; w/o using "rearm", the
"rescal" device will only ever fire once.

Of course for suspend/resume to work we also need to put the reset/rearm
calls in the suspend and resume routines.

Actually - I am sorry but it looks like you will have to split the patch
in two since this is two logical changes.

I do not believe this can be easily split, since there is currently a
misused of the reset controller API and this patch fixes all call sites
at once. It would not really make sense to fix probe/remove and then
leave suspend/resume broken in the same manner.
-- 
Florian

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Re: [PATCH v5 2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert

From: Lorenzo Pieralisi <hidden>
Date: 2021-03-29 16:59:55

On Mon, Mar 29, 2021 at 09:50:13AM -0700, Florian Fainelli wrote:

On 3/29/21 9:10 AM, Lorenzo Pieralisi wrote:

quoted

On Fri, Mar 12, 2021 at 03:45:55PM -0500, Jim Quinlan wrote:

quoted

The Broadcom STB PCIe RC uses a reset control "rescal" for certain chips.
The "rescal" implements a "pulse reset" so using assert/deassert is wrong
for this device.  Instead, we use reset/rearm.  We need to use rearm so
that we can reset it after a suspend/resume cycle; w/o using "rearm", the
"rescal" device will only ever fire once.

Of course for suspend/resume to work we also need to put the reset/rearm
calls in the suspend and resume routines.

Actually - I am sorry but it looks like you will have to split the patch
in two since this is two logical changes.

I do not believe this can be easily split, since there is currently a
misused of the reset controller API and this patch fixes all call sites
at once. It would not really make sense to fix probe/remove and then
leave suspend/resume broken in the same manner.

Right - I was reading the previous versions of the set, it makes sense
to keep it in one logical change.

Do you want me to take it or you prefer an ACK so that it can go via
a different tree ?

Thanks,
Lorenzo

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Re: [PATCH v5 2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert

From: Florian Fainelli <f.fainelli@gmail.com>
Date: 2021-03-29 17:02:36

On 3/29/21 9:58 AM, Lorenzo Pieralisi wrote:

On Mon, Mar 29, 2021 at 09:50:13AM -0700, Florian Fainelli wrote:

quoted

On 3/29/21 9:10 AM, Lorenzo Pieralisi wrote:

quoted

On Fri, Mar 12, 2021 at 03:45:55PM -0500, Jim Quinlan wrote:

quoted

The Broadcom STB PCIe RC uses a reset control "rescal" for certain chips.
The "rescal" implements a "pulse reset" so using assert/deassert is wrong
for this device.  Instead, we use reset/rearm.  We need to use rearm so
that we can reset it after a suspend/resume cycle; w/o using "rearm", the
"rescal" device will only ever fire once.

Of course for suspend/resume to work we also need to put the reset/rearm
calls in the suspend and resume routines.

Actually - I am sorry but it looks like you will have to split the patch
in two since this is two logical changes.

I do not believe this can be easily split, since there is currently a
misused of the reset controller API and this patch fixes all call sites
at once. It would not really make sense to fix probe/remove and then
leave suspend/resume broken in the same manner.

Right - I was reading the previous versions of the set, it makes sense
to keep it in one logical change.

Do you want me to take it or you prefer an ACK so that it can go via
a different tree ?

I would be comfortable with you taking this via the PCI driver trees, we
would want an Ack from Jens that he is okay with taking the ahci_brcm.c
change as well through your tree.

Thank you!
-- 
Florian

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Re: [PATCH v5 0/2] ata: ahci_brcm: Fix use of BCM7216 reset controller

From: Lorenzo Pieralisi <hidden>
Date: 2021-04-06 15:42:27

On Fri, 12 Mar 2021 15:45:53 -0500, Jim Quinlan wrote:

v5 -- Improved (I hope) commit description (Bjorn).
   -- Rnamed error labels (Krzyszt).
   -- Fixed typos.

v4 -- does not rely on a pending commit, unlike v3.

v3 -- discard commit from v2; instead rely on the new function
      reset_control_rearm provided in a recent commit [1] applied
      to reset/next.
   -- New commit to correct pcie-brcmstb.c usage of a reset controller
      to use reset/rearm verses deassert/assert.

[...]

Applied to pci/brcmstb, thanks!

[1/2] ata: ahci_brcm: Fix use of BCM7216 reset controller
      https://git.kernel.org/lpieralisi/pci/c/92b9cb55a9
[2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert
      https://git.kernel.org/lpieralisi/pci/c/a24fd1d646

Thanks,
Lorenzo

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Re: [PATCH v5 0/2] ata: ahci_brcm: Fix use of BCM7216 reset controller

From: Florian Fainelli <f.fainelli@gmail.com>
Date: 2021-04-06 16:38:57


On 4/6/2021 8:42 AM, Lorenzo Pieralisi wrote:

On Fri, 12 Mar 2021 15:45:53 -0500, Jim Quinlan wrote:

quoted

v5 -- Improved (I hope) commit description (Bjorn).
   -- Rnamed error labels (Krzyszt).
   -- Fixed typos.

v4 -- does not rely on a pending commit, unlike v3.

v3 -- discard commit from v2; instead rely on the new function
      reset_control_rearm provided in a recent commit [1] applied
      to reset/next.
   -- New commit to correct pcie-brcmstb.c usage of a reset controller
      to use reset/rearm verses deassert/assert.

[...]

Applied to pci/brcmstb, thanks!

[1/2] ata: ahci_brcm: Fix use of BCM7216 reset controller
      https://git.kernel.org/lpieralisi/pci/c/92b9cb55a9
[2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert
      https://git.kernel.org/lpieralisi/pci/c/a24fd1d646

Thanks a lot!
-- 
Florian

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