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ata: sata_mv: fix disk hotplug for Armada 370/XP SoCs 

On Armada 370/XP SoCs, once a disk is removed from a SATA port, then the
re-plug events are not detected by the sata_mv driver. This patch fixes
the issue by updating the PHY speed in the LP_PHY_CTL register (0x58)
according to the SControl speed.

Note that this fix is only applied if the compatible string
"marvell,armada-370-sata" is found in the SATA DT node.

Fixes: 9ae6f740b4 ("arm: mach-mvebu: add support for Armada 370 and Armada XP with DT")
Signed-off-by: Lior Amsalem <alior@marvell.com>
Signed-off-by: Nadav Haklai <nadavh@marvell.com>
Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Gregory Clement <gregory.clement@free-electrons.com>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Cc: stable@vger.kernel.org # v3.6+
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Lior Amsalem 2014-01-14 20:09:57 +01:00 committed by Tejun Heo
parent b1f5c73bd5
commit 9013d64e66
1 changed files with 24 additions and 0 deletions
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24
drivers/ata/sata_mv.c
View File

@ -304,6 +304,7 @@ enum {
MV5_LTMODE = 0x30,
MV5_PHY_CTL = 0x0C,
SATA_IFCFG = 0x050,
LP_PHY_CTL = 0x058,
MV_M2_PREAMP_MASK = 0x7e0,
@ -431,6 +432,7 @@ enum {
MV_HP_CUT_THROUGH = (1 << 10), /* can use EDMA cut-through */
MV_HP_FLAG_SOC = (1 << 11), /* SystemOnChip, no PCI */
MV_HP_QUIRK_LED_BLINK_EN = (1 << 12), /* is led blinking enabled? */
MV_HP_FIX_LP_PHY_CTL = (1 << 13), /* fix speed in LP_PHY_CTL ? */
/* Port private flags (pp_flags) */
MV_PP_FLAG_EDMA_EN = (1 << 0), /* is EDMA engine enabled? */
@ -1358,6 +1360,7 @@ static int mv_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val)
if (ofs != 0xffffffffU) {
void __iomem *addr = mv_ap_base(link->ap) + ofs;
struct mv_host_priv *hpriv = link->ap->host->private_data;
if (sc_reg_in == SCR_CONTROL) {
/*
* Workaround for 88SX60x1 FEr SATA#26:
@ -1374,6 +1377,18 @@ static int mv_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val)
*/
if ((val & 0xf) == 1 || (readl(addr) & 0xf) == 1)
val |= 0xf000;
if (hpriv->hp_flags & MV_HP_FIX_LP_PHY_CTL) {
void __iomem *lp_phy_addr =
mv_ap_base(link->ap) + LP_PHY_CTL;
/*
* Set PHY speed according to SControl speed.
*/
if ((val & 0xf0) == 0x10)
writelfl(0x7, lp_phy_addr);
else
writelfl(0x227, lp_phy_addr);
}
}
writelfl(val, addr);
return 0;
@ -4110,6 +4125,15 @@ static int mv_platform_probe(struct platform_device *pdev)
if (rc)
goto err;
/*
* To allow disk hotplug on Armada 370/XP SoCs, the PHY speed must be
* updated in the LP_PHY_CTL register.
*/
if (pdev->dev.of_node &&
of_device_is_compatible(pdev->dev.of_node,
"marvell,armada-370-sata"))
hpriv->hp_flags |= MV_HP_FIX_LP_PHY_CTL;
/* initialize adapter */
rc = mv_init_host(host);
if (rc)