From mboxrd@z Thu Jan 1 00:00:00 1970 From: dianders@chromium.org (Douglas Anderson) Date: Mon, 20 Jun 2016 10:56:41 -0700 Subject: [PATCH v3 02/15] phy: rockchip-emmc: configure frequency range and drive impedance In-Reply-To: <1466445414-11974-1-git-send-email-dianders@chromium.org> References: <1466445414-11974-1-git-send-email-dianders@chromium.org> Message-ID: <1466445414-11974-3-git-send-email-dianders@chromium.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Shawn Lin 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: Shawn Lin Signed-off-by: Brian Norris Signed-off-by: Douglas Anderson Acked-by: Kishon Vijay Abraham I Tested-by: Heiko Stuebner --- Changes in v3: - Add Brian's PHY patches into my series Changes in v2: - Drop 170 MHz comment (only applicable to a subtly different Arasan PHY) drivers/phy/phy-rockchip-emmc.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/phy/phy-rockchip-emmc.c b/drivers/phy/phy-rockchip-emmc.c index 48cbe691a889..f2f75cf69af1 100644 --- a/drivers/phy/phy-rockchip-emmc.c +++ b/drivers/phy/phy-rockchip-emmc.c @@ -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) -- 2.8.0.rc3.226.g39d4020