linux-kernel - [PATCH v3 4/4] misc: fastrpc: Update dma_bits for CDSP support on Kaanapali SoC

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Message-Id: <20251114084142.3386682-5-kumari.pallavi@oss.qualcomm.com>
Date: Fri, 14 Nov 2025 14:11:42 +0530
From: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
To: kpallavi@....qualcomm.com, srini@...nel.org, amahesh@....qualcomm.com,
        arnd@...db.de, gregkh@...uxfoundation.org
Cc: Kumari Pallavi <kumari.pallavi@....qualcomm.com>, quic_bkumar@...cinc.com,
        ekansh.gupta@....qualcomm.com, linux-kernel@...r.kernel.org,
        quic_chennak@...cinc.com, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, jingyi.wang@....qualcomm.com,
        aiqun.yu@....qualcomm.com, ktadakam@....qualcomm.com
Subject: [PATCH v3 4/4] misc: fastrpc: Update dma_bits for CDSP support on Kaanapali SoC

DSP currently supports 32-bit IOVA (32-bit PA + 4-bit SID) for
both Q6 and user DMA (uDMA) access. This is being upgraded to
34-bit PA + 4-bit SID due to a hardware revision in CDSP for
Kaanapali SoC, which expands the DMA addressable range.
Update DMA bits configuration in the driver to support CDSP on
Kaanapali SoC. Set the default `dma_bits` to 32-bit and update
it to 34-bit based on CDSP and OF matching on the fastrpc node.

Signed-off-by: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
---
 drivers/misc/fastrpc.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index bcf3c7f8d3e9..2eb8d37cd9b4 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -267,6 +267,8 @@ struct fastrpc_session_ctx {
 
 struct fastrpc_soc_data {
 	u32 sid_pos;
+	u32 cdsp_dma_bits;
+	u32 dsp_default_dma_bits;
 };
 
 struct fastrpc_channel_ctx {
@@ -2186,6 +2188,7 @@ static int fastrpc_cb_probe(struct platform_device *pdev)
 	int i, sessions = 0;
 	unsigned long flags;
 	int rc;
+	u32 dma_bits;
 
 	cctx = dev_get_drvdata(dev->parent);
 	if (!cctx)
@@ -2199,12 +2202,16 @@ static int fastrpc_cb_probe(struct platform_device *pdev)
 		spin_unlock_irqrestore(&cctx->lock, flags);
 		return -ENOSPC;
 	}
+	dma_bits = cctx->soc_data->dsp_default_dma_bits;
 	sess = &cctx->session[cctx->sesscount++];
 	sess->used = false;
 	sess->valid = true;
 	sess->dev = dev;
 	dev_set_drvdata(dev, sess);
 
+	if (cctx->domain_id == CDSP_DOMAIN_ID)
+		dma_bits = cctx->soc_data->cdsp_dma_bits;
+
 	if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
 		dev_info(dev, "FastRPC Session ID not specified in DT\n");
 
@@ -2219,9 +2226,9 @@ static int fastrpc_cb_probe(struct platform_device *pdev)
 		}
 	}
 	spin_unlock_irqrestore(&cctx->lock, flags);
-	rc = dma_set_mask(dev, DMA_BIT_MASK(32));
+	rc = dma_set_mask(dev, DMA_BIT_MASK(dma_bits));
 	if (rc) {
-		dev_err(dev, "32-bit DMA enable failed\n");
+		dev_err(dev, "%u-bit DMA enable failed\n", dma_bits);
 		return rc;
 	}
 
@@ -2308,10 +2315,14 @@ static int fastrpc_get_domain_id(const char *domain)
 
 static const struct fastrpc_soc_data kaanapali_soc_data = {
 	.sid_pos = 56,
+	.cdsp_dma_bits = 34,
+	.dsp_default_dma_bits = 32,
 };
 
 static const struct fastrpc_soc_data default_soc_data = {
 	.sid_pos = 32,
+	.cdsp_dma_bits = 32,
+	.dsp_default_dma_bits = 32,
 };
 
 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
-- 
2.34.1