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authorShawn Lin <shawn.lin@rock-chips.com>2016-06-20 10:56:40 -0700
committerUlf Hansson <ulf.hansson@linaro.org>2016-07-25 10:34:14 +0200
commit4d54a25ba5df8d4fd1c1604d1526c9279237ac27 (patch)
tree6fb4b4f9848dd112733b739585efc6ab352fd7b4 /drivers/phy
parent476bf3d62d5cc0ec003da37ba9da4f2b46c23660 (diff)
downloadlinux-4d54a25ba5df8d4fd1c1604d1526c9279237ac27.tar.bz2
phy: rockchip-emmc: give DLL some extra time to be ready
According to the databook, 10.2us is the max time for dll to be ready to work. However in testing, some chips need 20us for dll to be ready. This patch adds some extra margin for dllrdy to be ready, fixing our -ETIMEDOUT issues. Signed-off-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.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/phy/phy-rockchip-emmc.c b/drivers/phy/phy-rockchip-emmc.c
index 6ebcf3e41c46..48cbe691a889 100644
--- a/drivers/phy/phy-rockchip-emmc.c
+++ b/drivers/phy/phy-rockchip-emmc.c
@@ -119,10 +119,11 @@ static int rockchip_emmc_phy_power(struct rockchip_emmc_phy *rk_phy,
PHYCTRL_ENDLL_MASK,
PHYCTRL_ENDLL_SHIFT));
/*
- * After enable analog DLL circuits, we need extra 10.2us
- * for dll to be ready for work.
+ * After enable analog DLL circuits, we need an extra 10.2us
+ * for dll to be ready for work. But according to testing, we
+ * find some chips need more than 25us.
*/
- udelay(11);
+ udelay(30);
regmap_read(rk_phy->reg_base,
rk_phy->reg_offset + GRF_EMMCPHY_STATUS,
&dllrdy);