diff options
| author | Shawn Lin <shawn.lin@rock-chips.com> | 2018-01-11 05:40:26 +0300 |
|---|---|---|
| committer | Kishon Vijay Abraham I <kishon@ti.com> | 2018-03-08 11:26:22 +0300 |
| commit | a4781c2a74b249cad814ceea7272997bbd20051e (patch) | |
| tree | 26e259e5b1aa6471446314acace5b2cecf27ca26 /drivers/phy/rockchip/phy-rockchip-emmc.c | |
| parent | fee7e1d50c6e6da1d99035181ba5a5c88f5bb526 (diff) | |
| download | linux-a4781c2a74b249cad814ceea7272997bbd20051e.tar.xz | |
phy: rockchip-emmc: retry calpad busy trimming
It turns out that 5us isn't enough for all cases, so let's
retry some more times to wait for caldone.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Tested-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/phy/rockchip/phy-rockchip-emmc.c')
| -rw-r--r-- | drivers/phy/rockchip/phy-rockchip-emmc.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/phy/rockchip/phy-rockchip-emmc.c b/drivers/phy/rockchip/phy-rockchip-emmc.c index f1b24f18e9b2..b0d10934413f 100644 --- a/drivers/phy/rockchip/phy-rockchip-emmc.c +++ b/drivers/phy/rockchip/phy-rockchip-emmc.c @@ -76,6 +76,10 @@ #define PHYCTRL_OTAPDLYSEL_MASK 0xf #define PHYCTRL_OTAPDLYSEL_SHIFT 0x7 +#define PHYCTRL_IS_CALDONE(x) \ + ((((x) >> PHYCTRL_CALDONE_SHIFT) & \ + PHYCTRL_CALDONE_MASK) == PHYCTRL_CALDONE_DONE) + struct rockchip_emmc_phy { unsigned int reg_offset; struct regmap *reg_base; @@ -90,6 +94,7 @@ static int rockchip_emmc_phy_power(struct phy *phy, bool on_off) unsigned int freqsel = PHYCTRL_FREQSEL_200M; unsigned long rate; unsigned long timeout; + int ret; /* * Keep phyctrl_pdb and phyctrl_endll low to allow @@ -160,17 +165,19 @@ static int rockchip_emmc_phy_power(struct phy *phy, bool on_off) PHYCTRL_PDB_SHIFT)); /* - * According to the user manual, it asks driver to - * wait 5us for calpad busy trimming + * According to the user manual, it asks driver to wait 5us for + * calpad busy trimming. However it is documented that this value is + * PVT(A.K.A process,voltage and temperature) relevant, so some + * failure cases are found which indicates we should be more tolerant + * to calpad busy trimming. */ - udelay(5); - regmap_read(rk_phy->reg_base, - rk_phy->reg_offset + GRF_EMMCPHY_STATUS, - &caldone); - caldone = (caldone >> PHYCTRL_CALDONE_SHIFT) & PHYCTRL_CALDONE_MASK; - if (caldone != PHYCTRL_CALDONE_DONE) { - pr_err("rockchip_emmc_phy_power: caldone timeout.\n"); - return -ETIMEDOUT; + ret = regmap_read_poll_timeout(rk_phy->reg_base, + rk_phy->reg_offset + GRF_EMMCPHY_STATUS, + caldone, PHYCTRL_IS_CALDONE(caldone), + 0, 50); + if (ret) { + pr_err("%s: caldone failed, ret=%d\n", __func__, ret); + return ret; } /* Set the frequency of the DLL operation */ |