On Fri, Sep 16, 2022 at 03:54:16PM +0530, Rajendra Nayak wrote:
> The USB controller on sc7180 does not retain the state when
> the system goes into low power state and the GDSC is
> turned off. This results in the controller reinitializing and
> re-enumerating all the connected devices (resulting in additional
> delay while coming out of suspend)
> Fix this by updating the .pwrsts for the USB GDSC so it only
> transitions to retention state in low power.
>
> Signed-off-by: Rajendra Nayak <quic_rjendra@xxxxxxxxxxx>
> Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
> Tested-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
> ---
> v2:
> Updated the changelog
>
> drivers/clk/qcom/gcc-sc7180.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/clk/qcom/gcc-sc7180.c b/drivers/clk/qcom/gcc-sc7180.c
> index c2ea09945c47..2d3980251e78 100644
> --- a/drivers/clk/qcom/gcc-sc7180.c
> +++ b/drivers/clk/qcom/gcc-sc7180.c
> @@ -2224,7 +2224,7 @@ static struct gdsc usb30_prim_gdsc = {
> .pd = {
> .name = "usb30_prim_gdsc",
> },
> - .pwrsts = PWRSTS_OFF_ON,
> + .pwrsts = PWRSTS_RET_ON,
> };
>
> static struct gdsc hlos1_vote_mmnoc_mmu_tbu_hf0_gdsc = {
It seems like the above will not work unless you also provide the
registers offsets that gdsc_force_mem_on() expects.
Specifically, unless you set cxc_count for the GDSC, the above call is a
no-op and the retention setting (i.e. the RETAIN_MEM and RETAIN_PERIPH
bits) will not be updated when registering the GDSC.
Johan
