[U-Boot] [PATCH v2 2/7] sunxi: H6: DRAM: follow recommended PHY init algorithm

Andre Przywara
2019-07-02T09:51:43Z

The DRAM controller manual suggests to first program the PHY
initialisation parameters to the PHY_PIR register, and then set bit 0 to
trigger the initialisation. This is also used in boot0.

Follow this recommendation by setting bit 0 in a separate step.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
arch/arm/mach-sunxi/dram_sun50i_h6.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-sunxi/dram_sun50i_h6.c b/arch/arm/mach-sunxi/dram_sun50i_h6.c
index e2f141eb9b..7a8b724f08 100644
--- a/arch/arm/mach-sunxi/dram_sun50i_h6.c
+++ b/arch/arm/mach-sunxi/dram_sun50i_h6.c
@@ -75,12 +75,14 @@ static void mctl_core_init(struct dram_para *para)
mctl_channel_init(para);
}

+/* PHY initialisation */
static void mctl_phy_pir_init(u32 val)
{
struct sunxi_mctl_phy_reg * const mctl_phy =
(struct sunxi_mctl_phy_reg *)SUNXI_DRAM_PHY0_BASE;

- writel(val | BIT(0), &mctl_phy->pir);
+ writel(val, &mctl_phy->pir);
+ writel(val | BIT(0), &mctl_phy->pir); /* Start initialisation. */
mctl_await_completion(&mctl_phy->pgsr[0], BIT(0), BIT(0));
}

--
2.17.1