[PATCH 02/17] firmware: scmi: smt: Interrupt communication enable

[Alice Guo]

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

When interrupt driven communication is supported, the transport allows
the caller to choose between interrupt and polling driven
communications. To make the choice, the channel flags are used. i.MX95
uses interrupt driven communication so that Channel flags should be set
to 1.

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 |  4 ++++
 drivers/firmware/scmi/smt.h | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/firmware/scmi/smt.c b/drivers/firmware/scmi/smt.c
index 67d2f45002490ab64a6bc997eda93a8f4681d99b..e5b902dcb0e641065f4c0faae6bc6660a7e2c6af 100644
--- a/drivers/firmware/scmi/smt.c
+++ b/drivers/firmware/scmi/smt.c
@@ -48,6 +48,10 @@ int scmi_dt_get_smt_buffer(struct udevice *dev, struct scmi_smt *smt)
 	if (!smt->buf)
 		return -ENOMEM;
 
+	/* Command should complete via an interrupt so that set Channel flags to 1. */
+	if (IS_ENABLED(CONFIG_IMX95))
+		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),
diff --git a/drivers/firmware/scmi/smt.h b/drivers/firmware/scmi/smt.h
index 9d669a6c922666c48e7dce4c0affd7b47cb137e4..768b0f4c8a8d1cc7966530e724d278d72c2a167b 100644
--- a/drivers/firmware/scmi/smt.h
+++ b/drivers/firmware/scmi/smt.h
@@ -84,6 +84,16 @@ static inline void scmi_smt_put_channel(struct scmi_smt *smt)
 	hdr->channel_status &= ~SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR;
 }
 
+static inline 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;
+}
+
 int scmi_dt_get_smt_buffer(struct udevice *dev, struct scmi_smt *smt);
 
 /*

-- 
2.34.1