interconnect: qcom: Add support for mask-based BCMs

Some BCMs aren't directly associated with the data path (i.e. ACV) and
therefore don't communicate using BW. Instead, they are simply
enabled/disabled with a simple bit mask. Add support for these.

Origin commit retrieved from:
https://git.codelinaro.org/clo/la/kernel/msm-5.15/-/commit/2d1573e0206998151b342e6b52a4c0f7234d7e36

Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>
[narmstrong: removed copyright change from original commit]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230619-topic-sm8550-upstream-interconnect-mask-vote-v2-1-709474b151cc@linaro.org
Fixes: fafc114a468e ("interconnect: qcom: Add SM8450 interconnect provider driver")
Signed-off-by: Georgi Djakov <djakov@kernel.org>

diff --git a/drivers/interconnect/qcom/bcm-voter.c b/drivers/interconnect/qcom/bcm-voter.c
index 8f385f9..d5f2a6b 100644 (file)
--- a/drivers/interconnect/qcom/bcm-voter.c
+++ b/drivers/interconnect/qcom/bcm-voter.c
@@ -83,6 +83,11 @@ static void bcm_aggregate(struct qcom_icc_bcm *bcm)
 
                temp = agg_peak[bucket] * bcm->vote_scale;
                bcm->vote_y[bucket] = bcm_div(temp, bcm->aux_data.unit);
+
+               if (bcm->enable_mask && (bcm->vote_x[bucket] || bcm->vote_y[bucket])) {
+                       bcm->vote_x[bucket] = 0;
+                       bcm->vote_y[bucket] = bcm->enable_mask;
+               }
        }
 
        if (bcm->keepalive && bcm->vote_x[QCOM_ICC_BUCKET_AMC] == 0 &&

diff --git a/drivers/interconnect/qcom/icc-rpmh.h b/drivers/interconnect/qcom/icc-rpmh.h
index 04391c1..7843d88 100644 (file)
--- a/drivers/interconnect/qcom/icc-rpmh.h
+++ b/drivers/interconnect/qcom/icc-rpmh.h
@@ -81,6 +81,7 @@ struct qcom_icc_node {
  * @vote_x: aggregated threshold values, represents sum_bw when @type is bw bcm
  * @vote_y: aggregated threshold values, represents peak_bw when @type is bw bcm
  * @vote_scale: scaling factor for vote_x and vote_y
+ * @enable_mask: optional mask to send as vote instead of vote_x/vote_y
  * @dirty: flag used to indicate whether the bcm needs to be committed
  * @keepalive: flag used to indicate whether a keepalive is required
  * @aux_data: auxiliary data used when calculating threshold values and
@@ -97,6 +98,7 @@ struct qcom_icc_bcm {
        u64 vote_x[QCOM_ICC_NUM_BUCKETS];
        u64 vote_y[QCOM_ICC_NUM_BUCKETS];
        u64 vote_scale;
+       u32 enable_mask;
        bool dirty;
        bool keepalive;
        struct bcm_db aux_data;