for-5.6/libata-2020-01-27

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Merge tag 'for-5.6/libata-2020-01-27' of git://git.kernel.dk/linux-block

Pull libata updates from Jens Axboe:
 "As usual pretty quiet, mostly trivial fixes (or dead code removal),
  outside of various fixes for ahci_bcrm"

* tag 'for-5.6/libata-2020-01-27' of git://git.kernel.dk/linux-block:
  ata/acard_ahci: remove unused variable n_elem
  ata: pata_macio: fix comparing pointer to 0
  ata: ahci_brcm: BCM7216 reset is self de-asserting
  ata: ahci_brcm: Perform reset after obtaining resources
  ata: brcm: fix reset controller API usage
  ata: brcm: mark PM functions as __maybe_unused
  ata: ahci_brcm: Support BCM7216 reset controller name
  dt-bindings: ata: Document BCM7216 AHCI controller compatible
  ata: ahci_brcm: Add a shutdown callback
  ata: ahci_brcm: Manage reset line during suspend/resume

Documentation/devicetree/bindings/ata/brcm,sata-brcm.txt

@@ -5,6 +5,7 @@ Each SATA controller should have its own node.
 
 Required properties:
 - compatible         : should be one or more of
+			"brcm,bcm7216-ahci"
 			"brcm,bcm7425-ahci"
 			"brcm,bcm7445-ahci"
 			"brcm,bcm-nsp-ahci"
@@ -14,6 +15,12 @@ Required properties:
 - reg-names          : "ahci" and "top-ctrl"
 - interrupts         : interrupt mapping for SATA IRQ
 
+Optional properties:
+
+- reset: for "brcm,bcm7216-ahci" must be a valid reset phandle
+  pointing to the RESCAL reset controller provider node.
+- reset-names: for "brcm,bcm7216-ahci", must be "rescal".
+
 Also see ahci-platform.txt.
 
 Example:

drivers/ata/acard-ahci.c

@@ -218,7 +218,6 @@ static enum ata_completion_errors acard_ahci_qc_prep(struct ata_queued_cmd *qc)
 	void *cmd_tbl;
 	u32 opts;
 	const u32 cmd_fis_len = 5; /* five dwords */
-	unsigned int n_elem;
 
 	/*
 	 * Fill in command table information.  First, the header,
@@ -232,9 +231,8 @@ static enum ata_completion_errors acard_ahci_qc_prep(struct ata_queued_cmd *qc)
 		memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
 	}
 
-	n_elem = 0;
 	if (qc->flags & ATA_QCFLAG_DMAMAP)
-		n_elem = acard_ahci_fill_sg(qc, cmd_tbl);
+		acard_ahci_fill_sg(qc, cmd_tbl);
 
 	/*
 	 * Fill in command slot information.

drivers/ata/ahci_brcm.c

@@ -73,6 +73,7 @@ enum brcm_ahci_version {
 	BRCM_SATA_BCM7425 = 1,
 	BRCM_SATA_BCM7445,
 	BRCM_SATA_NSP,
+	BRCM_SATA_BCM7216,
 };
 
 enum brcm_ahci_quirks {
@@ -337,24 +338,39 @@ static const struct ata_port_info ahci_brcm_port_info = {
 	.port_ops	= &ahci_brcm_platform_ops,
 };
 
-#ifdef CONFIG_PM_SLEEP
 static int brcm_ahci_suspend(struct device *dev)
 {
 	struct ata_host *host = dev_get_drvdata(dev);
 	struct ahci_host_priv *hpriv = host->private_data;
 	struct brcm_ahci_priv *priv = hpriv->plat_data;
+	int ret;
 
 	brcm_sata_phys_disable(priv);
 
-	return ahci_platform_suspend(dev);
+	if (IS_ENABLED(CONFIG_PM_SLEEP))
+		ret = ahci_platform_suspend(dev);
+	else
+		ret = 0;
+
+	if (priv->version != BRCM_SATA_BCM7216)
+		reset_control_assert(priv->rcdev);
+
+	return ret;
 }
 
-static int brcm_ahci_resume(struct device *dev)
+static int __maybe_unused brcm_ahci_resume(struct device *dev)
 {
 	struct ata_host *host = dev_get_drvdata(dev);
 	struct ahci_host_priv *hpriv = host->private_data;
 	struct brcm_ahci_priv *priv = hpriv->plat_data;
-	int ret;
+	int ret = 0;
+
+	if (priv->version == BRCM_SATA_BCM7216)
+		ret = reset_control_reset(priv->rcdev);
+	else
+		ret = reset_control_deassert(priv->rcdev);
+	if (ret)
+		return ret;
 
 	/* Make sure clocks are turned on before re-configuration */
 	ret = ahci_platform_enable_clks(hpriv);
@@ -393,7 +409,6 @@ out_disable_phys:
 	ahci_platform_disable_clks(hpriv);
 	return ret;
 }
-#endif
 
 static struct scsi_host_template ahci_platform_sht = {
 	AHCI_SHT(DRV_NAME),
@@ -404,6 +419,7 @@ static const struct of_device_id ahci_of_match[] = {
 	{.compatible = "brcm,bcm7445-ahci", .data = (void *)BRCM_SATA_BCM7445},
 	{.compatible = "brcm,bcm63138-ahci", .data = (void *)BRCM_SATA_BCM7445},
 	{.compatible = "brcm,bcm-nsp-ahci", .data = (void *)BRCM_SATA_NSP},
+	{.compatible = "brcm,bcm7216-ahci", .data = (void *)BRCM_SATA_BCM7216},
 	{},
 };
 MODULE_DEVICE_TABLE(of, ahci_of_match);
@@ -412,6 +428,7 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *of_id;
 	struct device *dev = &pdev->dev;
+	const char *reset_name = NULL;
 	struct brcm_ahci_priv *priv;
 	struct ahci_host_priv *hpriv;
 	struct resource *res;
@@ -433,16 +450,19 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->top_ctrl))
 		return PTR_ERR(priv->top_ctrl);
 
-	/* Reset is optional depending on platform */
-	priv->rcdev = devm_reset_control_get(&pdev->dev, "ahci");
-	if (!IS_ERR_OR_NULL(priv->rcdev))
-		reset_control_deassert(priv->rcdev);
+	/* Reset is optional depending on platform and named differently */
+	if (priv->version == BRCM_SATA_BCM7216)
+		reset_name = "rescal";
+	else
+		reset_name = "ahci";
+
+	priv->rcdev = devm_reset_control_get_optional(&pdev->dev, reset_name);
+	if (IS_ERR(priv->rcdev))
+		return PTR_ERR(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;
@@ -459,6 +479,13 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 		break;
 	}
 
+	if (priv->version == BRCM_SATA_BCM7216)
+		ret = reset_control_reset(priv->rcdev);
+	else
+		ret = reset_control_deassert(priv->rcdev);
+	if (ret)
+		return ret;
+
 	ret = ahci_platform_enable_clks(hpriv);
 	if (ret)
 		goto out_reset;
@@ -500,7 +527,7 @@ out_disable_phys:
 out_disable_clks:
 	ahci_platform_disable_clks(hpriv);
 out_reset:
-	if (!IS_ERR_OR_NULL(priv->rcdev))
+	if (priv->version != BRCM_SATA_BCM7216)
 		reset_control_assert(priv->rcdev);
 	return ret;
 }
@@ -521,11 +548,26 @@ static int brcm_ahci_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void brcm_ahci_shutdown(struct platform_device *pdev)
+{
+	int ret;
+
+	/* All resources releasing happens via devres, but our device, unlike a
+	 * proper remove is not disappearing, therefore using
+	 * brcm_ahci_suspend() here which does explicit power management is
+	 * appropriate.
+	 */
+	ret = brcm_ahci_suspend(&pdev->dev);
+	if (ret)
+		dev_err(&pdev->dev, "failed to shutdown\n");
+}
+
 static SIMPLE_DEV_PM_OPS(ahci_brcm_pm_ops, brcm_ahci_suspend, brcm_ahci_resume);
 
 static struct platform_driver brcm_ahci_driver = {
 	.probe = brcm_ahci_probe,
 	.remove = brcm_ahci_remove,
+	.shutdown = brcm_ahci_shutdown,
 	.driver = {
 		.name = DRV_NAME,
 		.of_match_table = ahci_of_match,

drivers/ata/pata_macio.c

@@ -979,7 +979,7 @@ static void pata_macio_invariants(struct pata_macio_priv *priv)
 	priv->aapl_bus_id =  bidp ? *bidp : 0;
 
 	/* Fixup missing Apple bus ID in case of media-bay */
-	if (priv->mediabay && bidp == 0)
+	if (priv->mediabay && !bidp)
 		priv->aapl_bus_id = 1;
 }