[PATCH 4/4] remoteproc: qcom: q6v5-pil: Add PDC restart for modem on SDM845 SoCs

Sibi Sankar
2018-07-27T15:28:11Z

In the presence of a PDC block working with subsystem RSC,
assert/deassert PDC restart in modem start/stop path.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---
.../bindings/remoteproc/qcom,q6v5.txt | 4 +++
drivers/remoteproc/qcom_q6v5_pil.c | 27 ++++++++++++++++---
2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt b/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
index 601dd9f389aa..124fb1dc6fb8 100644
--- a/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
@@ -51,6 +51,8 @@ on the Qualcomm Hexagon core.
Usage: required
Value type: <phandle>
Definition: reference to the reset-controller for the modem sub-system
+ reference to the list of 2 reset-controllers for the modem
+ sub-system on SDM845 SoCs
reference to the list of 3 reset-controllers for the
wcss sub-system

@@ -58,6 +60,8 @@ on the Qualcomm Hexagon core.
Usage: required
Value type: <stringlist>
Definition: must be "mss_restart" for the modem sub-system
+ Definition: must be "mss_restart", "pdc_restart" for the modem
+ sub-system on SDM845 SoCs
Definition: must be "wcss_aon_reset", "wcss_reset", "wcss_q6_reset"
for the wcss syb-system

diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
index d57fdb34e3dd..5be794639fc3 100644
--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -149,6 +149,7 @@ struct q6v5 {
u32 halt_nc;

struct reset_control *mss_restart;
+ struct reset_control *pdc_restart;

struct qcom_q6v5 q6v5;

@@ -349,10 +350,17 @@ static int q6v5_load(struct rproc *rproc, const struct firmware *fw)

static int q6v5_reset_assert(struct q6v5 *qproc)
{
- if (qproc->has_alt_reset)
- return reset_control_reset(qproc->mss_restart);
- else
- return reset_control_assert(qproc->mss_restart);
+ int ret;
+
+ if (qproc->has_alt_reset) {
+ reset_control_assert(qproc->pdc_restart);
+ ret = reset_control_reset(qproc->mss_restart);
+ reset_control_deassert(qproc->pdc_restart);
+ } else {
+ ret = reset_control_assert(qproc->mss_restart);
+ }
+
+ return ret;
}

static int q6v5_reset_deassert(struct q6v5 *qproc)
@@ -360,9 +368,11 @@ static int q6v5_reset_deassert(struct q6v5 *qproc)
int ret;

if (qproc->has_alt_reset) {
+ reset_control_assert(qproc->pdc_restart);
writel(1, qproc->rmb_base + RMB_MBA_ALT_RESET);
ret = reset_control_reset(qproc->mss_restart);
writel(0, qproc->rmb_base + RMB_MBA_ALT_RESET);
+ reset_control_deassert(qproc->pdc_restart);
} else {
ret = reset_control_deassert(qproc->mss_restart);
}
@@ -1182,6 +1192,15 @@ static int q6v5_init_reset(struct q6v5 *qproc)
return PTR_ERR(qproc->mss_restart);
}

+ if (qproc->has_alt_reset) {
+ qproc->pdc_restart = devm_reset_control_get(qproc->dev,
+ "pdc_restart");
+ if (IS_ERR(qproc->pdc_restart)) {
+ dev_err(qproc->dev, "failed to acquire pdc restart\n");
+ return PTR_ERR(qproc->pdc_restart);
+ }
+ }
+
return 0;
}

--
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