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Commit a6e72624 authored by Russell King's avatar Russell King Committed by Tejun Heo
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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: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: default avatarShawn Guo <shawn.guo@freescale.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent dcb1b29b

drivers/ata/ahci_imx.c

+13 −1
Original line number Diff line number Diff line
@@ -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;

	}