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clk: qcom: gdsc: Add support for ALWAYS_ON gdscs 

Some GDSCs might have software control to turn them off, but we might
want to keep them enabled always, in some cases because of lack of
support in kernel to handle a graceful turning off/on of such GDSCs.
Most common instances would be the GDCSs which power up the noc/bus
fabrics, which need bus drivers to handle them and atleast support for
which is missing on all qcom SoCs.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Rajendra Nayak 2018-03-23 13:56:14 +05:30 committed by Stephen Boyd
parent 60cc43fc88
commit fb55bea1fe
2 changed files with 9 additions and 0 deletions
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8
drivers/clk/qcom/gdsc.c
View File

@ -291,6 +291,14 @@ static int gdsc_init(struct gdsc *sc)
if ((sc->flags & VOTABLE) && on)
gdsc_enable(&sc->pd);
/* If ALWAYS_ON GDSCs are not ON, turn them ON */
if (sc->flags & ALWAYS_ON) {
if (!on)
gdsc_enable(&sc->pd);
on = true;
sc->pd.flags |= GENPD_FLAG_ALWAYS_ON;
}
if (on || (sc->pwrsts & PWRSTS_RET))
gdsc_force_mem_on(sc);
else

1
drivers/clk/qcom/gdsc.h
View File

@ -53,6 +53,7 @@ struct gdsc {
#define VOTABLE BIT(0)
#define CLAMP_IO BIT(1)
#define HW_CTRL BIT(2)
#define ALWAYS_ON BIT(3)
struct reset_controller_dev *rcdev;
unsigned int *resets;
unsigned int reset_count;