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| author | Amit Nischal <anischal@codeaurora.org> | 2018-04-09 11:41:44 +0300 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2018-04-17 07:12:12 +0300 |
| commit | 44dbeebf14453f577dd1f15f5c4f55db47ac42a4 (patch) | |
| tree | 0808a2cb33d8124a98df4b8cad0a53056320ab6e /drivers/clk/qcom/gdsc.c | |
| parent | 687d7a0caa7736de53e3c5efdef6b5343d1470ac (diff) | |
| download | linux-44dbeebf14453f577dd1f15f5c4f55db47ac42a4.tar.xz | |
clk: qcom: gdsc: Add support to reset AON and block reset logic
For some of the gdsc power domains, there could be need to reset the
AON logic or assert/deassert the block control reset before removing
the clamp_io. Add support for the same by introducing new flags
SW_RESET and AON_RESET. Both SW reset and AON reset requires to be
asserted for at least 1us before being de-asserted.
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Amit Nischal <anischal@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/qcom/gdsc.c')
| -rw-r--r-- | drivers/clk/qcom/gdsc.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c index a4f3580587b7..266fefa3a94a 100644 --- a/drivers/clk/qcom/gdsc.c +++ b/drivers/clk/qcom/gdsc.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2015, The Linux Foundation. All rights reserved. + * Copyright (c) 2015, 2017-2018, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -31,6 +31,7 @@ #define HW_CONTROL_MASK BIT(1) #define SW_COLLAPSE_MASK BIT(0) #define GMEM_CLAMP_IO_MASK BIT(0) +#define GMEM_RESET_MASK BIT(4) /* Wait 2^n CXO cycles between all states. Here, n=2 (4 cycles). */ #define EN_REST_WAIT_VAL (0x2 << 20) @@ -166,6 +167,14 @@ static inline void gdsc_assert_clamp_io(struct gdsc *sc) GMEM_CLAMP_IO_MASK, 1); } +static inline void gdsc_assert_reset_aon(struct gdsc *sc) +{ + regmap_update_bits(sc->regmap, sc->clamp_io_ctrl, + GMEM_RESET_MASK, 1); + udelay(1); + regmap_update_bits(sc->regmap, sc->clamp_io_ctrl, + GMEM_RESET_MASK, 0); +} static int gdsc_enable(struct generic_pm_domain *domain) { struct gdsc *sc = domain_to_gdsc(domain); @@ -174,8 +183,17 @@ static int gdsc_enable(struct generic_pm_domain *domain) if (sc->pwrsts == PWRSTS_ON) return gdsc_deassert_reset(sc); - if (sc->flags & CLAMP_IO) + if (sc->flags & SW_RESET) { + gdsc_assert_reset(sc); + udelay(1); + gdsc_deassert_reset(sc); + } + + if (sc->flags & CLAMP_IO) { + if (sc->flags & AON_RESET) + gdsc_assert_reset_aon(sc); gdsc_deassert_clamp_io(sc); + } ret = gdsc_toggle_logic(sc, true); if (ret) |