[PATCH] firmware: scmi: smt: Interrupt communication enable

[Alice Guo (OSS)]

From: Viorel Suman <viorel.suman at nxp.com>

i.MX95 System Manager uses interrupt driven communication which requires
the caller to set Bit[0] of channel flags to 1. When transmission
completes and the previous general purpose interrupt has been processed
by the other core, i.MX95 System Manager will set General Purpose
Interrupt Control Register (GCR). U-Boot polls General-purpose Status
(GSR) to check if the operation is finished.

Signed-off-by: Viorel Suman <viorel.suman at nxp.com>
Signed-off-by: Alice Guo <alice.guo at nxp.com>
Reviewed-by: Ye Li <ye.li at nxp.com>
---
 drivers/firmware/scmi/smt.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/firmware/scmi/smt.c b/drivers/firmware/scmi/smt.c
index 67d2f450024..3253f4211d6 100644
--- a/drivers/firmware/scmi/smt.c
+++ b/drivers/firmware/scmi/smt.c
@@ -20,6 +20,16 @@
 
 #include "smt.h"
 
+static void scmi_smt_enable_intr(struct scmi_smt *smt, bool enable)
+{
+	struct scmi_smt_header *hdr = (void *)smt->buf;
+
+	if (enable)
+		hdr->flags |= SCMI_SHMEM_FLAG_INTR_ENABLED;
+	else
+		hdr->flags &= ~SCMI_SHMEM_FLAG_INTR_ENABLED;
+}
+
 /**
  * Get shared memory configuration defined by the referred DT phandle
  * Return with a errno compliant value.
@@ -48,6 +58,9 @@ int scmi_dt_get_smt_buffer(struct udevice *dev, struct scmi_smt *smt)
 	if (!smt->buf)
 		return -ENOMEM;
 
+	if (device_is_compatible(dev, "arm,scmi") && ofnode_has_property(dev_ofnode(dev), "mboxes"))
+		scmi_smt_enable_intr(smt, true);
+
 #ifdef CONFIG_ARM
 	if (dcache_status())
 		mmu_set_region_dcache_behaviour(ALIGN_DOWN((uintptr_t)smt->buf, MMU_SECTION_SIZE),
-- 
2.43.0