From: Taniya Das <quic_tdas@xxxxxxxxxxx> commit ddab91f4b2de5c5b46e312a90107d9353087d8ea upstream. In the cases where the power domain connected to logics is allowed to transition from a level(L)-->power collapse(0)-->retention(1) or vice versa retention(1)-->power collapse(0)-->level(L) will cause the logic to lose the configurations. The ARC does not support retention to collapse transition on MxC rails. The targets from SM8450 onwards the PLL logics of clock controllers are connected to MxC rails and the recommended configurations are carried out during the clock controller probes. The MxC transition as mentioned above should be skipped to ensure the PLL settings are intact across clock controller power on & off. On older targets that do not split MX into MxA and MxC does not collapse the logic and it is parked always at RETENTION, thus this issue is never observed on those targets. Cc: stable@xxxxxxxxxxxxxxx # v5.17 Reviewed-by: Bjorn Andersson <andersson@xxxxxxxxxx> Signed-off-by: Taniya Das <quic_tdas@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20240625-avoid_mxc_retention-v2-1-af9c2f549a5f@xxxxxxxxxxx Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/pmdomain/qcom/rpmhpd.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/drivers/pmdomain/qcom/rpmhpd.c +++ b/drivers/pmdomain/qcom/rpmhpd.c @@ -40,6 +40,7 @@ * @addr: Resource address as looped up using resource name from * cmd-db * @state_synced: Indicator that sync_state has been invoked for the rpmhpd resource + * @skip_retention_level: Indicate that retention level should not be used for the power domain */ struct rpmhpd { struct device *dev; @@ -56,6 +57,7 @@ struct rpmhpd { const char *res_name; u32 addr; bool state_synced; + bool skip_retention_level; }; struct rpmhpd_desc { @@ -173,6 +175,7 @@ static struct rpmhpd mxc = { .pd = { .name = "mxc", }, .peer = &mxc_ao, .res_name = "mxc.lvl", + .skip_retention_level = true, }; static struct rpmhpd mxc_ao = { @@ -180,6 +183,7 @@ static struct rpmhpd mxc_ao = { .active_only = true, .peer = &mxc, .res_name = "mxc.lvl", + .skip_retention_level = true, }; static struct rpmhpd nsp = { @@ -819,6 +823,9 @@ static int rpmhpd_update_level_mapping(s return -EINVAL; for (i = 0; i < rpmhpd->level_count; i++) { + if (rpmhpd->skip_retention_level && buf[i] == RPMH_REGULATOR_LEVEL_RETENTION) + continue; + rpmhpd->level[i] = buf[i]; /* Remember the first corner with non-zero level */ Patches currently in stable-queue which might be from quic_tdas@xxxxxxxxxxx are queue-6.9/pmdomain-qcom-rpmhpd-skip-retention-level-for-power-domains.patch
