+++ /dev/null
-From 10f3c772363e549c3dbd3cc3755d270c5656d5b8 Mon Sep 17 00:00:00 2001
-From: Hans de Goede <hdegoede@redhat.com>
-Date: Sat, 22 Feb 2014 16:53:30 +0100
-Subject: [PATCH 109/182] libahci: Allow drivers to override start_engine
-
-Allwinner A10 and A20 ARM SoCs have an AHCI sata controller which needs a
-special register to be poked before starting the DMA engine.
-
-This register gets reset on an ahci_stop_engine call, so there is no other
-place then ahci_start_engine where this poking can be done.
-
-This commit allows drivers to override ahci_start_engine behavior for use by
-the Allwinner AHCI driver (and potentially other drivers in the future).
-
-Signed-off-by: Hans de Goede <hdegoede@redhat.com>
-Signed-off-by: Tejun Heo <tj@kernel.org>
----
- drivers/ata/ahci.c | 6 ++++--
- drivers/ata/ahci.h | 6 ++++++
- drivers/ata/libahci.c | 26 +++++++++++++++++++-------
- drivers/ata/sata_highbank.c | 3 ++-
- 4 files changed, 31 insertions(+), 10 deletions(-)
-
---- a/drivers/ata/ahci.c
-+++ b/drivers/ata/ahci.c
-@@ -606,6 +606,7 @@ static int ahci_vt8251_hardreset(struct
- unsigned long deadline)
- {
- struct ata_port *ap = link->ap;
-+ struct ahci_host_priv *hpriv = ap->host->private_data;
- bool online;
- int rc;
-
-@@ -616,7 +617,7 @@ static int ahci_vt8251_hardreset(struct
- rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
- deadline, &online, NULL);
-
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
-
- DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
-
-@@ -631,6 +632,7 @@ static int ahci_p5wdh_hardreset(struct a
- {
- struct ata_port *ap = link->ap;
- struct ahci_port_priv *pp = ap->private_data;
-+ struct ahci_host_priv *hpriv = ap->host->private_data;
- u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
- struct ata_taskfile tf;
- bool online;
-@@ -646,7 +648,7 @@ static int ahci_p5wdh_hardreset(struct a
- rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
- deadline, &online, NULL);
-
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
-
- /* The pseudo configuration device on SIMG4726 attached to
- * ASUS P5W-DH Deluxe doesn't send signature FIS after
---- a/drivers/ata/ahci.h
-+++ b/drivers/ata/ahci.h
-@@ -324,6 +324,12 @@ struct ahci_host_priv {
- u32 em_msg_type; /* EM message type */
- struct clk *clk; /* Only for platforms supporting clk */
- void *plat_data; /* Other platform data */
-+ /*
-+ * Optional ahci_start_engine override, if not set this gets set to the
-+ * default ahci_start_engine during ahci_save_initial_config, this can
-+ * be overridden anytime before the host is activated.
-+ */
-+ void (*start_engine)(struct ata_port *ap);
- };
-
- extern int ahci_ignore_sss;
---- a/drivers/ata/libahci.c
-+++ b/drivers/ata/libahci.c
-@@ -394,6 +394,9 @@ static ssize_t ahci_show_em_supported(st
- *
- * If inconsistent, config values are fixed up by this function.
- *
-+ * If it is not set already this function sets hpriv->start_engine to
-+ * ahci_start_engine.
-+ *
- * LOCKING:
- * None.
- */
-@@ -500,6 +503,9 @@ void ahci_save_initial_config(struct dev
- hpriv->cap = cap;
- hpriv->cap2 = cap2;
- hpriv->port_map = port_map;
-+
-+ if (!hpriv->start_engine)
-+ hpriv->start_engine = ahci_start_engine;
- }
- EXPORT_SYMBOL_GPL(ahci_save_initial_config);
-
-@@ -766,7 +772,7 @@ static void ahci_start_port(struct ata_p
-
- /* enable DMA */
- if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
-
- /* turn on LEDs */
- if (ap->flags & ATA_FLAG_EM) {
-@@ -1234,7 +1240,7 @@ int ahci_kick_engine(struct ata_port *ap
-
- /* restart engine */
- out_restart:
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
- return rc;
- }
- EXPORT_SYMBOL_GPL(ahci_kick_engine);
-@@ -1426,6 +1432,7 @@ static int ahci_hardreset(struct ata_lin
- const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
- struct ata_port *ap = link->ap;
- struct ahci_port_priv *pp = ap->private_data;
-+ struct ahci_host_priv *hpriv = ap->host->private_data;
- u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
- struct ata_taskfile tf;
- bool online;
-@@ -1443,7 +1450,7 @@ static int ahci_hardreset(struct ata_lin
- rc = sata_link_hardreset(link, timing, deadline, &online,
- ahci_check_ready);
-
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
-
- if (online)
- *class = ahci_dev_classify(ap);
-@@ -2007,10 +2014,12 @@ static void ahci_thaw(struct ata_port *a
-
- void ahci_error_handler(struct ata_port *ap)
- {
-+ struct ahci_host_priv *hpriv = ap->host->private_data;
-+
- if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
- /* restart engine */
- ahci_stop_engine(ap);
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
- }
-
- sata_pmp_error_handler(ap);
-@@ -2031,6 +2040,7 @@ static void ahci_post_internal_cmd(struc
-
- static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
- {
-+ struct ahci_host_priv *hpriv = ap->host->private_data;
- void __iomem *port_mmio = ahci_port_base(ap);
- struct ata_device *dev = ap->link.device;
- u32 devslp, dm, dito, mdat, deto;
-@@ -2094,7 +2104,7 @@ static void ahci_set_aggressive_devslp(s
- PORT_DEVSLP_ADSE);
- writel(devslp, port_mmio + PORT_DEVSLP);
-
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
-
- /* enable device sleep feature for the drive */
- err_mask = ata_dev_set_feature(dev,
-@@ -2106,6 +2116,7 @@ static void ahci_set_aggressive_devslp(s
-
- static void ahci_enable_fbs(struct ata_port *ap)
- {
-+ struct ahci_host_priv *hpriv = ap->host->private_data;
- struct ahci_port_priv *pp = ap->private_data;
- void __iomem *port_mmio = ahci_port_base(ap);
- u32 fbs;
-@@ -2134,11 +2145,12 @@ static void ahci_enable_fbs(struct ata_p
- } else
- dev_err(ap->host->dev, "Failed to enable FBS\n");
-
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
- }
-
- static void ahci_disable_fbs(struct ata_port *ap)
- {
-+ struct ahci_host_priv *hpriv = ap->host->private_data;
- struct ahci_port_priv *pp = ap->private_data;
- void __iomem *port_mmio = ahci_port_base(ap);
- u32 fbs;
-@@ -2166,7 +2178,7 @@ static void ahci_disable_fbs(struct ata_
- pp->fbs_enabled = false;
- }
-
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
- }
-
- static void ahci_pmp_attach(struct ata_port *ap)
---- a/drivers/ata/sata_highbank.c
-+++ b/drivers/ata/sata_highbank.c
-@@ -403,6 +403,7 @@ static int ahci_highbank_hardreset(struc
- static const unsigned long timing[] = { 5, 100, 500};
- struct ata_port *ap = link->ap;
- struct ahci_port_priv *pp = ap->private_data;
-+ struct ahci_host_priv *hpriv = ap->host->private_data;
- u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
- struct ata_taskfile tf;
- bool online;
-@@ -431,7 +432,7 @@ static int ahci_highbank_hardreset(struc
- break;
- } while (!online && retry--);
-
-- ahci_start_engine(ap);
-+ hpriv->start_engine(ap);
-
- if (online)
- *class = ahci_dev_classify(ap);
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