arm: mach-omap2: am33xx: ddr: programming of EXT_PHY_CTRL1 and EXT_PHY_CTRL1_SHADOW

Adjust DQS skew in case where invert_clkout=1 is used.
Match recommended values from EMIF Tools app note:

http://www.ti.com/lit/an/sprac70/sprac70.pdf

Signed-off-by: Brad Griffis <bgriffis@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>

diff --git a/arch/arm/mach-omap2/am33xx/ddr.c b/arch/arm/mach-omap2/am33xx/ddr.c
index be6f4d7..816d4e8 100644 (file)
--- a/arch/arm/mach-omap2/am33xx/ddr.c
+++ b/arch/arm/mach-omap2/am33xx/ddr.c
@@ -256,8 +256,16 @@ static void ext_phy_settings_hwlvl(const struct emif_regs *regs, int nr)
         * Enable hardware leveling on the EMIF.  For details about these
         * magic values please see the EMIF registers section of the TRM.
         */
-       writel(0x08020080, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_1);
-       writel(0x08020080, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_1_shdw);
+       if (regs->emif_ddr_phy_ctlr_1 & 0x00040000) {
+               /* PHY_INVERT_CLKOUT = 1 */
+               writel(0x00040100, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_1);
+               writel(0x00040100, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_1_shdw);
+       } else {
+               /* PHY_INVERT_CLKOUT = 0 */
+               writel(0x08020080, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_1);
+               writel(0x08020080, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_1_shdw);
+       }
+
        writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_22);
        writel(0x00000000, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_22_shdw);
        writel(0x00600020, &emif_reg[nr]->emif_ddr_ext_phy_ctrl_23);