[PATCH v2 14/33] drivers: soc: ti: k3-ringacc: fix k3_ringacc_ring_reset_sci

[Sascha Hauer <s.hauer@pengutronix.de>]

Based on Linux downstream commit:

| commit 5591c7f9a0fedc8dde70e6f2143165e296084249
| Author: Sai Sree Kartheek Adivi <s-adivi@ti.com>
| Date:   Fri Mar 7 03:26:59 2025 +0530
|
|     PENDING: drivers: soc: ti: k3-ringacc: fix k3_ringacc_ring_reset_sci
|
|     Add non-tisci implementation for k3_ringacc_ring_reset_sci using direct
|     register writes.
|
|     Fixes: a621a1075550f ("PENDING: drivers: soc: ti: k3-ringacc: handle absence of tisci")
|     Signed-off-by: Sai Sree Kartheek Adivi <s-adivi@ti.com>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/soc/ti/k3-navss-ringacc.c | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/soc/ti/k3-navss-ringacc.c b/drivers/soc/ti/k3-navss-ringacc.c
index dfc397a1f5aca08a90ed773540bdeae9f50b8173..18fb9153caa467b3159e035448e16da65563b36e 100644
--- a/drivers/soc/ti/k3-navss-ringacc.c
+++ b/drivers/soc/ti/k3-navss-ringacc.c
@@ -472,20 +472,29 @@ static void k3_ringacc_ring_reset_sci(struct k3_ring *ring)
 	struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
 	struct k3_ringacc *ringacc = ring->parent;
 	int ret;
+	u32 reg;
 
-	/* TODO: Implement ring reset without tisci */
-	if (!ringacc->tisci)
-		return;
+	if (!ringacc->tisci) {
+		if (ring->cfg == NULL)
+			return;
+		reg = readl(&ring->cfg->size);
+		reg &= ~K3_DMARING_CFG_SIZE_MASK;
 
-	ring_cfg.nav_id = ringacc->tisci_dev_id;
-	ring_cfg.index = ring->ring_id;
-	ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_RING_COUNT_VALID;
-	ring_cfg.count = ring->size;
+		writel(reg, &ring->cfg->size);
+		reg |= ring->size;
 
-	ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
-	if (ret)
-		dev_err(ringacc->dev, "TISCI reset ring fail (%d) ring_idx %d\n",
-			ret, ring->ring_id);
+		writel(reg, &ring->cfg->size);
+	} else {
+		ring_cfg.nav_id = ringacc->tisci_dev_id;
+		ring_cfg.index = ring->ring_id;
+		ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_RING_COUNT_VALID;
+		ring_cfg.count = ring->size;
+
+		ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
+		if (ret)
+			dev_err(ringacc->dev, "TISCI reset ring fail (%d) ring_idx %d\n",
+				ret, ring->ring_id);
+	}
 }
 
 void k3_ringacc_ring_reset(struct k3_ring *ring)

-- 
2.39.5