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-rw-r--r--target/linux/mvebu/patches-4.14/531-ATA-ahci_mvebu-pmp-stop-errata-226.patch110
1 files changed, 110 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-4.14/531-ATA-ahci_mvebu-pmp-stop-errata-226.patch b/target/linux/mvebu/patches-4.14/531-ATA-ahci_mvebu-pmp-stop-errata-226.patch
new file mode 100644
index 0000000000..e71cc0c49f
--- /dev/null
+++ b/target/linux/mvebu/patches-4.14/531-ATA-ahci_mvebu-pmp-stop-errata-226.patch
@@ -0,0 +1,110 @@
+From daa2e3bdbb0b3e691cf20a042350817310cb8cb5 Mon Sep 17 00:00:00 2001
+From: Evan Wang <xswang@marvell.com>
+Date: Fri, 13 Apr 2018 12:32:31 +0800
+Subject: [PATCH] ata: ahci: mvebu: override ahci_stop_engine for mvebu AHCI
+
+There is an issue(Errata Ref#226) that the SATA can not be
+detected via SATA Port-MultiPlayer(PMP) with following
+error log:
+ ata1.15: PMP product ID mismatch
+ ata1.15: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
+ ata1.15: Port Multiplier vendor mismatch '0x1b4b'!='0x0'
+ ata1.15: PMP revalidation failed (errno=-19)
+
+After debugging, the reason is found that the value Port-x
+FIS-based Switching Control(PxFBS@0x40) become wrong.
+According to design, the bits[11:8, 0] of register PxFBS
+are cleared when Port Command and Status (0x18) bit[0]
+changes its value from 1 to 0, i.e. falling edge of Port
+Command and Status bit[0] sends PULSE that resets PxFBS
+bits[11:8; 0].
+So it needs a mvebu SATA WA to save the port PxFBS register
+before PxCMD ST write and restore it afterwards.
+
+This patch implements the WA in a separate function of
+ahci_mvebu_stop_engine to override ahci_stop_gngine.
+
+Signed-off-by: Evan Wang <xswang@marvell.com>
+Cc: Ofer Heifetz <oferh@marvell.com>
+Cc: Tejun Heo <tj@kernel.org>
+Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+Signed-off-by: Tejun Heo <tj@kernel.org>
+---
+ drivers/ata/ahci_mvebu.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 56 insertions(+)
+
+diff --git a/drivers/ata/ahci_mvebu.c b/drivers/ata/ahci_mvebu.c
+index de7128d81e9cc..0045dacd814b4 100644
+--- a/drivers/ata/ahci_mvebu.c
++++ b/drivers/ata/ahci_mvebu.c
+@@ -62,6 +62,60 @@ static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv)
+ writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
+ }
+
++/**
++ * ahci_mvebu_stop_engine
++ *
++ * @ap: Target ata port
++ *
++ * Errata Ref#226 - SATA Disk HOT swap issue when connected through
++ * Port Multiplier in FIS-based Switching mode.
++ *
++ * To avoid the issue, according to design, the bits[11:8, 0] of
++ * register PxFBS are cleared when Port Command and Status (0x18) bit[0]
++ * changes its value from 1 to 0, i.e. falling edge of Port
++ * Command and Status bit[0] sends PULSE that resets PxFBS
++ * bits[11:8; 0].
++ *
++ * This function is used to override function of "ahci_stop_engine"
++ * from libahci.c by adding the mvebu work around(WA) to save PxFBS
++ * value before the PxCMD ST write of 0, then restore PxFBS value.
++ *
++ * Return: 0 on success; Error code otherwise.
++ */
++int ahci_mvebu_stop_engine(struct ata_port *ap)
++{
++ void __iomem *port_mmio = ahci_port_base(ap);
++ u32 tmp, port_fbs;
++
++ tmp = readl(port_mmio + PORT_CMD);
++
++ /* check if the HBA is idle */
++ if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
++ return 0;
++
++ /* save the port PxFBS register for later restore */
++ port_fbs = readl(port_mmio + PORT_FBS);
++
++ /* setting HBA to idle */
++ tmp &= ~PORT_CMD_START;
++ writel(tmp, port_mmio + PORT_CMD);
++
++ /*
++ * bit #15 PxCMD signal doesn't clear PxFBS,
++ * restore the PxFBS register right after clearing the PxCMD ST,
++ * no need to wait for the PxCMD bit #15.
++ */
++ writel(port_fbs, port_mmio + PORT_FBS);
++
++ /* wait for engine to stop. This could be as long as 500 msec */
++ tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
++ PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
++ if (tmp & PORT_CMD_LIST_ON)
++ return -EIO;
++
++ return 0;
++}
++
+ #ifdef CONFIG_PM_SLEEP
+ static int ahci_mvebu_suspend(struct platform_device *pdev, pm_message_t state)
+ {
+@@ -112,6 +166,8 @@ static int ahci_mvebu_probe(struct platform_device *pdev)
+ if (rc)
+ return rc;
+
++ hpriv->stop_engine = ahci_mvebu_stop_engine;
++
+ if (of_device_is_compatible(pdev->dev.of_node,
+ "marvell,armada-380-ahci")) {
+ dram = mv_mbus_dram_info();
+