diff options
Diffstat (limited to 'target/linux/mvebu/patches-4.14/531-ATA-ahci_mvebu-pmp-stop-errata-226.patch')
| -rw-r--r-- | target/linux/mvebu/patches-4.14/531-ATA-ahci_mvebu-pmp-stop-errata-226.patch | 110 |
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 0000000..e71cc0c --- /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(); + |