Re: [PATCH] Revert "ata: ahci-platform: add reset control support"

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HI,

On 09-04-18 03:32, Kunihiko Hayashi wrote:
This reverts commit f0f56716fc3e5d547fd7811eb218a30ed0695605.

According to Thierry's view,
https://www.spinics.net/lists/linux-ide/msg55357.html
some hardware-specific drivers already use their own resets,
and the common reset might make a path to occur double controls of resets.

For now, revert the commit that adds reset control support to ahci-platform,
and hold until the solution is confirmed not be affect all hardware-specific
drivers.

Fixes: f0f56716fc3e ("ata: ahci-platform: add reset control support")
Reported-by: Thierry Reding <thierry.reding@xxxxxxxxx>
Suggested-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>

Acked-by: Hans de Goede <hdegoede@xxxxxxxxxx>

Regards,

Hans



---
  .../devicetree/bindings/ata/ahci-platform.txt      |  1 -
  drivers/ata/ahci.h                                 |  1 -
  drivers/ata/libahci_platform.c                     | 24 +++-------------------
  3 files changed, 3 insertions(+), 23 deletions(-)

diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index f4006d3..c760ecb 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -30,7 +30,6 @@ compatible:
  Optional properties:
  - dma-coherent      : Present if dma operations are coherent
  - clocks            : a list of phandle + clock specifier pairs
-- resets            : a list of phandle + reset specifier pairs
  - target-supply     : regulator for SATA target power
  - phys              : reference to the SATA PHY node
  - phy-names         : must be "sata-phy"
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 4356ef1..a9d996e 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -350,7 +350,6 @@ struct ahci_host_priv {
  	u32			em_msg_type;	/* EM message type */
  	bool			got_runtime_pm; /* Did we do pm_runtime_get? */
  	struct clk		*clks[AHCI_MAX_CLKS]; /* Optional */
-	struct reset_control	*rsts;		/* Optional */
  	struct regulator	**target_pwrs;	/* Optional */
  	/*
  	 * If platform uses PHYs. There is a 1:1 relation between the port number and
diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 46a7624..30cc8f1 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -25,7 +25,6 @@
  #include <linux/phy/phy.h>
  #include <linux/pm_runtime.h>
  #include <linux/of_platform.h>
-#include <linux/reset.h>
  #include "ahci.h"
static void ahci_host_stop(struct ata_host *host);
@@ -196,8 +195,7 @@ EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
   * following order:
   * 1) Regulator
   * 2) Clocks (through ahci_platform_enable_clks)
- * 3) Resets
- * 4) Phys
+ * 3) Phys
   *
   * If resource enabling fails at any point the previous enabled resources
   * are disabled in reverse order.
@@ -217,19 +215,12 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
  	if (rc)
  		goto disable_regulator;
- rc = reset_control_deassert(hpriv->rsts);
-	if (rc)
-		goto disable_clks;
-
  	rc = ahci_platform_enable_phys(hpriv);
  	if (rc)
-		goto disable_resets;
+		goto disable_clks;
return 0; -disable_resets:
-	reset_control_assert(hpriv->rsts);
-
  disable_clks:
  	ahci_platform_disable_clks(hpriv);
@@ -248,15 +239,12 @@ EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);
   * following order:
   * 1) Phys
   * 2) Clocks (through ahci_platform_disable_clks)
- * 3) Resets
- * 4) Regulator
+ * 3) Regulator
   */
  void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
  {
  	ahci_platform_disable_phys(hpriv);
- reset_control_assert(hpriv->rsts);
-
  	ahci_platform_disable_clks(hpriv);
ahci_platform_disable_regulators(hpriv);
@@ -405,12 +393,6 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
  		hpriv->clks[i] = clk;
  	}
- hpriv->rsts = devm_reset_control_array_get_optional_shared(dev);
-	if (IS_ERR(hpriv->rsts)) {
-		rc = PTR_ERR(hpriv->rsts);
-		goto err_out;
-	}
-
  	hpriv->nports = child_nodes = of_get_child_count(dev->of_node);
/*

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