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ata: ahci_imx: add disable for spread-spectrum 

Spread-spectrum doesn't work with Cubox-i hardware, so we have to
disable this feature.  Add a DT property so that platforms can
indicate that this feature should not be enabled.

Having it as a negative property keeps existing DT files working.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Russell King 2014-06-24 11:19:47 +01:00 committed by Tejun Heo
parent dcb1b29b08
commit a6e726244c
1 changed files with 13 additions and 1 deletions
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14
drivers/ata/ahci_imx.c
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@ -368,6 +368,7 @@ struct reg_property {
const struct reg_value *values;
size_t num_values;
u32 def_value;
u32 set_value;
};
static const struct reg_value gpr13_tx_level[] = {
@ -465,6 +466,10 @@ static const struct reg_property gpr13_props[] = {
.values = gpr13_rx_eq,
.num_values = ARRAY_SIZE(gpr13_rx_eq),
.def_value = IMX6Q_GPR13_SATA_RX_EQ_VAL_3_0_DB,
}, {
.name = "fsl,no-spread-spectrum",
.def_value = IMX6Q_GPR13_SATA_MPLL_SS_EN,
.set_value = 0,
},
};
@ -478,6 +483,14 @@ static u32 imx_ahci_parse_props(struct device *dev,
for (i = 0; i < num; i++, prop++) {
u32 of_val;
if (prop->num_values == 0) {
if (of_property_read_bool(np, prop->name))
reg_value |= prop->set_value;
else
reg_value |= prop->def_value;
continue;
}
if (of_property_read_u32(np, prop->name, &of_val)) {
dev_info(dev, "%s not specified, using %08x\n",
prop->name, prop->def_value);
@ -549,7 +562,6 @@ static int imx_ahci_probe(struct platform_device *pdev)
IMX6Q_GPR13_SATA_RX_LOS_LVL_SATA2M |
IMX6Q_GPR13_SATA_RX_DPLL_MODE_2P_4F |
IMX6Q_GPR13_SATA_SPD_MODE_3P0G |
IMX6Q_GPR13_SATA_MPLL_SS_EN |
reg_value;
}