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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>
This commit is contained in:
Shawn Lin 2018-01-11 10:40:26 +08:00 committed by Kishon Vijay Abraham I
parent fee7e1d50c
commit a4781c2a74
1 changed files with 17 additions and 10 deletions
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27
drivers/phy/rockchip/phy-rockchip-emmc.c
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@ -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 */