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Commit d7485772 authored by Shawn Lin's avatar Shawn Lin Committed by Ulf Hansson
Browse files

phy: rockchip-emmc: configure frequency range and drive impedance 



Signal integrity analysis has suggested we set these values. Do this in
power_on(), so that they get reconfigured after suspend/resume.

Signed-off-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: default avatarBrian Norris <briannorris@chromium.org>
Signed-off-by: default avatarDouglas Anderson <dianders@chromium.org>
Acked-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Tested-by: default avatarHeiko Stuebner <heiko@sntech.de>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 4d54a25b

drivers/phy/phy-rockchip-emmc.c

+27 −0
Original line number Diff line number Diff line
@@ -56,6 +56,19 @@ 
#define PHYCTRL_DLLRDY_SHIFT	0x5

#define PHYCTRL_DLLRDY_DONE	0x1

#define PHYCTRL_DLLRDY_GOING	0x0

#define PHYCTRL_FREQSEL_200M	0x0

#define PHYCTRL_FREQSEL_50M	0x1

#define PHYCTRL_FREQSEL_100M	0x2

#define PHYCTRL_FREQSEL_150M	0x3

#define PHYCTRL_FREQSEL_MASK	0x3

#define PHYCTRL_FREQSEL_SHIFT	0xc

#define PHYCTRL_DR_MASK		0x7

#define PHYCTRL_DR_SHIFT	0x4

#define PHYCTRL_DR_50OHM	0x0

#define PHYCTRL_DR_33OHM	0x1

#define PHYCTRL_DR_66OHM	0x2

#define PHYCTRL_DR_100OHM	0x3

#define PHYCTRL_DR_40OHM	0x4



struct rockchip_emmc_phy {

	unsigned int	reg_offset;
@@ -154,6 +167,20 @@ static int rockchip_emmc_phy_power_on(struct phy *phy) 
	struct rockchip_emmc_phy *rk_phy = phy_get_drvdata(phy);

	int ret = 0;



	/* DLL operation: 200 MHz */

	regmap_write(rk_phy->reg_base,

		     rk_phy->reg_offset + GRF_EMMCPHY_CON0,

		     HIWORD_UPDATE(PHYCTRL_FREQSEL_200M,

				   PHYCTRL_FREQSEL_MASK,

				   PHYCTRL_FREQSEL_SHIFT));



	/* Drive impedance: 50 Ohm */

	regmap_write(rk_phy->reg_base,

		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,

		     HIWORD_UPDATE(PHYCTRL_DR_50OHM,

				   PHYCTRL_DR_MASK,

				   PHYCTRL_DR_SHIFT));



	/* Power up emmc phy analog blocks */

	ret = rockchip_emmc_phy_power(rk_phy, PHYCTRL_PDB_PWR_ON);

	if (ret)