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| author | Taniya Das <tdas@codeaurora.org> | 2020-07-24 21:37:55 +0530 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2020-07-24 13:04:48 -0700 |
| commit | 173722995cdb7c22d21abd484a5001c903df1e20 (patch) | |
| tree | fed0c85756139d4883b5c24564cab0c4775b2d7e /drivers/clk | |
| parent | 413d84b88bee08ed59713e782053ff38d206c606 (diff) | |
| download | linux-173722995cdb7c22d21abd484a5001c903df1e20.tar.gz linux-173722995cdb7c22d21abd484a5001c903df1e20.tar.bz2 linux-173722995cdb7c22d21abd484a5001c903df1e20.zip | |
clk: qcom: gdsc: Add support to enable retention of GSDCR
Add support for the RETAIN_FF_ENABLE feature which enables the
usage of retention registers. These registers maintain their
state after disabling and re-enabling a GDSC.
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lore.kernel.org/r/1595606878-2664-2-git-send-email-tdas@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/qcom/gdsc.c | 12 | ||||
| -rw-r--r-- | drivers/clk/qcom/gdsc.h | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c index 7e4273f314f7..bfc4ac02f9ea 100644 --- a/drivers/clk/qcom/gdsc.c +++ b/drivers/clk/qcom/gdsc.c @@ -30,6 +30,7 @@ /* CFG_GDSCR */ #define GDSC_POWER_UP_COMPLETE BIT(16) #define GDSC_POWER_DOWN_COMPLETE BIT(15) +#define GDSC_RETAIN_FF_ENABLE BIT(11) #define CFG_GDSCR_OFFSET 0x4 /* Wait 2^n CXO cycles between all states. Here, n=2 (4 cycles). */ @@ -217,6 +218,14 @@ static inline void gdsc_assert_reset_aon(struct gdsc *sc) regmap_update_bits(sc->regmap, sc->clamp_io_ctrl, GMEM_RESET_MASK, 0); } + +static void gdsc_retain_ff_on(struct gdsc *sc) +{ + u32 mask = GDSC_RETAIN_FF_ENABLE; + + regmap_update_bits(sc->regmap, sc->gdscr, mask, mask); +} + static int gdsc_enable(struct generic_pm_domain *domain) { struct gdsc *sc = domain_to_gdsc(domain); @@ -269,6 +278,9 @@ static int gdsc_enable(struct generic_pm_domain *domain) udelay(1); } + if (sc->flags & RETAIN_FF_ENABLE) + gdsc_retain_ff_on(sc); + return 0; } diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h index 1896bfb2bbd1..bd537438c793 100644 --- a/drivers/clk/qcom/gdsc.h +++ b/drivers/clk/qcom/gdsc.h @@ -50,6 +50,7 @@ struct gdsc { #define AON_RESET BIT(4) #define POLL_CFG_GDSCR BIT(5) #define ALWAYS_ON BIT(6) +#define RETAIN_FF_ENABLE BIT(7) struct reset_controller_dev *rcdev; unsigned int *resets; unsigned int reset_count; |