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Subject[PATCH 1/3] clk: qcom: gdsc: Add support to reset AON and block reset logic
Date
From: Amit Nischal <anischal@codeaurora.org>

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>
---
drivers/clk/qcom/gdsc.c | 22 ++++++++++++++++++++--
drivers/clk/qcom/gdsc.h | 4 +++-
2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index a4f3580..266fefa 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)
diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h
index 3964834..9279278 100644
--- a/drivers/clk/qcom/gdsc.h
+++ b/drivers/clk/qcom/gdsc.h
@@ -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
@@ -53,6 +53,8 @@ struct gdsc {
#define VOTABLE BIT(0)
#define CLAMP_IO BIT(1)
#define HW_CTRL BIT(2)
+#define SW_RESET BIT(3)
+#define AON_RESET BIT(4)
struct reset_controller_dev *rcdev;
unsigned int *resets;
unsigned int reset_count;
--
Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc.is a member
of the Code Aurora Forum, hosted by the Linux Foundation.
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