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authorBrian Norris <briannorris@chromium.org>2016-06-20 20:56:42 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2016-07-25 11:34:15 +0300
commit36b5d460261f16563f9196c49c936b3e17d237e3 (patch)
tree649f80a4b0422946e2023d549fc6c49a6db02eb8 /drivers/phy
parentd74857720d41c58f74966b5d06ebfa9111a62c69 (diff)
downloadlinux-36b5d460261f16563f9196c49c936b3e17d237e3.tar.xz
phy: rockchip-emmc: configure default output tap delay
The output tap delay controls helps maintain the hold requirements for eMMC. The exact value is dependent on the SoC and other factors, though it isn't really an exact science. But the default of 0 is not very good, as it doesn't give the eMMC much hold time, so let's bump up to 4 (approx 90 degree phase?). If we need to configure this any further (e.g., based on board or speed factors), we may need to consider a device tree representation. Suggested-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Douglas Anderson <dianders@chromium.org> Acked-by: Kishon Vijay Abraham I <kishon@ti.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/phy-rockchip-emmc.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/phy/phy-rockchip-emmc.c b/drivers/phy/phy-rockchip-emmc.c
index f2f75cf69af1..a0b87cc6c818 100644
--- a/drivers/phy/phy-rockchip-emmc.c
+++ b/drivers/phy/phy-rockchip-emmc.c
@@ -69,6 +69,11 @@
#define PHYCTRL_DR_66OHM 0x2
#define PHYCTRL_DR_100OHM 0x3
#define PHYCTRL_DR_40OHM 0x4
+#define PHYCTRL_OTAPDLYENA 0x1
+#define PHYCTRL_OTAPDLYENA_MASK 0x1
+#define PHYCTRL_OTAPDLYENA_SHIFT 0xb
+#define PHYCTRL_OTAPDLYSEL_MASK 0xf
+#define PHYCTRL_OTAPDLYSEL_SHIFT 0x7
struct rockchip_emmc_phy {
unsigned int reg_offset;
@@ -181,6 +186,20 @@ static int rockchip_emmc_phy_power_on(struct phy *phy)
PHYCTRL_DR_MASK,
PHYCTRL_DR_SHIFT));
+ /* Output tap delay: enable */
+ regmap_write(rk_phy->reg_base,
+ rk_phy->reg_offset + GRF_EMMCPHY_CON0,
+ HIWORD_UPDATE(PHYCTRL_OTAPDLYENA,
+ PHYCTRL_OTAPDLYENA_MASK,
+ PHYCTRL_OTAPDLYENA_SHIFT));
+
+ /* Output tap delay */
+ regmap_write(rk_phy->reg_base,
+ rk_phy->reg_offset + GRF_EMMCPHY_CON0,
+ HIWORD_UPDATE(4,
+ PHYCTRL_OTAPDLYSEL_MASK,
+ PHYCTRL_OTAPDLYSEL_SHIFT));
+
/* Power up emmc phy analog blocks */
ret = rockchip_emmc_phy_power(rk_phy, PHYCTRL_PDB_PWR_ON);
if (ret)