Message-Id: <20250416075613.2116792-1-iuliana.prodan@oss.nxp.com>
Date: Wed, 16 Apr 2025 10:56:13 +0300
From: "Iuliana Prodan (OSS)" <iuliana.prodan@....nxp.com>
To: Mathieu Poirier <mathieu.poirier@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	"S.J. Wang" <shengjiu.wang@....com>,
	Fabio Estevam <festevam@...il.com>,
	Daniel Baluta <daniel.baluta@....com>,
	Mpuaudiosw <Mpuaudiosw@....com>,
	Iuliana Prodan <iuliana.prodan@....com>
Cc: imx@...ts.linux.dev,
	linux-remoteproc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: [PATCH v5] remoteproc: imx_dsp_rproc: Add support for DSP-specific features

From: Iuliana Prodan <iuliana.prodan@....com>

Some DSP firmware requires a FW_READY signal before proceeding, while
others do not.
Therefore, add support to handle i.MX DSP-specific features.

Implement handle_rsc callback to handle resource table parsing and to
process DSP-specific resource, to determine if waiting is needed.

Update imx_dsp_rproc_start() to handle this condition accordingly.

Signed-off-by: Iuliana Prodan <iuliana.prodan@....com>
---
Changes in v5:
- Reviews from Mathieu Poirier:
  - ensure resource length matches struct size exactly.
- Link to v4: https://lore.kernel.org/all/20250409213030.3489481-1-iuliana.prodan@oss.nxp.com/

Changes in v4:
- Reviews from Mathieu Poirier:
  - Adjusted len to include the size of struct fw_rsc_imx_dsp.
  - Updated len validation checks.
- Review from Frank Li:
  - In imx_dsp_rproc_handle_rsc(), removed the goto ignored statement.
- In probe(), set flags to WAIT_FW_READY to ensure the host waits
for fw_ready when no vendor-specific resource is defined.
- Link to v3: https://lore.kernel.org/all/20250403100124.637889-1-iuliana.prodan@oss.nxp.com/

Changes in v3:
- Reviews from Mathieu Poirier:
  - Added version and magic number to vendor-specific resource table entry.
  - Updated defines to maintain backward compatibility with a resource table that doesn't have a vendor-specific resource.
    - By default, wait for `fw_ready`, unless specified otherwise.
- Link to v2: https://lore.kernel.org/all/20250318215007.2109726-1-iuliana.prodan@oss.nxp.com

Changes in v2:
- Reviews from Mathieu Poirier:
  - Use vendor-specific resource table entry.
  - Implement resource handler specific to the i.MX DSP.
- Revise commit message to include recent updates.
- Link to v1: https://lore.kernel.org/all/20250305123923.514386-1-iuliana.prodan@oss.nxp.com/

 drivers/remoteproc/imx_dsp_rproc.c | 98 +++++++++++++++++++++++++++++-
 1 file changed, 96 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
index b9bb15970966..a16d9c4238ed 100644
--- a/drivers/remoteproc/imx_dsp_rproc.c
+++ b/drivers/remoteproc/imx_dsp_rproc.c
@@ -35,9 +35,18 @@ module_param_named(no_mailboxes, no_mailboxes, int, 0644);
 MODULE_PARM_DESC(no_mailboxes,
 		 "There is no mailbox between cores, so ignore remote proc reply after start, default is 0 (off).");
 
+/* Flag indicating that the remote is up and running */
 #define REMOTE_IS_READY				BIT(0)
+/* Flag indicating that the host should wait for a firmware-ready response */
+#define WAIT_FW_READY				BIT(1)
 #define REMOTE_READY_WAIT_MAX_RETRIES		500
 
+/*
+ * This flag is set in the DSP resource table's features field to indicate
+ * that the firmware requires the host NOT to wait for a FW_READY response.
+ */
+#define FEATURE_DONT_WAIT_FW_READY		BIT(0)
+
 /* att flags */
 /* DSP own area */
 #define ATT_OWN					BIT(31)
@@ -72,6 +81,10 @@ MODULE_PARM_DESC(no_mailboxes,
 
 #define IMX8ULP_SIP_HIFI_XRDC			0xc200000e
 
+#define FW_RSC_NXP_S_MAGIC			((uint32_t)'n' << 24 |	\
+						 (uint32_t)'x' << 16 |	\
+						 (uint32_t)'p' << 8 |	\
+						 (uint32_t)'s')
 /*
  * enum - Predefined Mailbox Messages
  *
@@ -136,6 +149,24 @@ struct imx_dsp_rproc_dcfg {
 	int (*reset)(struct imx_dsp_rproc *priv);
 };
 
+/**
+ * struct fw_rsc_imx_dsp - i.MX DSP specific info
+ *
+ * @len: length of the resource entry
+ * @magic_num: 32-bit magic number
+ * @version: version of data structure
+ * @features: feature flags supported by the i.MX DSP firmware
+ *
+ * This represents a DSP-specific resource in the firmware's
+ * resource table, providing information on supported features.
+ */
+struct fw_rsc_imx_dsp {
+	uint32_t len;
+	uint32_t magic_num;
+	uint32_t version;
+	uint32_t features;
+} __packed;
+
 static const struct imx_rproc_att imx_dsp_rproc_att_imx8qm[] = {
 	/* dev addr , sys addr  , size	    , flags */
 	{ 0x596e8000, 0x556e8000, 0x00008000, ATT_OWN },
@@ -300,6 +331,66 @@ static int imx_dsp_rproc_ready(struct rproc *rproc)
 	return -ETIMEDOUT;
 }
 
+/**
+ * imx_dsp_rproc_handle_rsc() - Handle DSP-specific resource table entries
+ * @rproc: remote processor instance
+ * @rsc_type: resource type identifier
+ * @rsc: pointer to the resource entry
+ * @offset: offset of the resource entry
+ * @avail: available space in the resource table
+ *
+ * Parse the DSP-specific resource entry and update flags accordingly.
+ * If the WAIT_FW_READY feature is set, the host must wait for the firmware
+ * to signal readiness before proceeding with execution.
+ *
+ * Return: RSC_HANDLED if processed successfully, RSC_IGNORED otherwise.
+ */
+static int imx_dsp_rproc_handle_rsc(struct rproc *rproc, u32 rsc_type,
+				    void *rsc, int offset, int avail)
+{
+	struct imx_dsp_rproc *priv = rproc->priv;
+	struct fw_rsc_imx_dsp *imx_dsp_rsc = rsc;
+	struct device *dev = rproc->dev.parent;
+
+	if (!imx_dsp_rsc) {
+		dev_dbg(dev, "Invalid fw_rsc_imx_dsp.\n");
+		return RSC_IGNORED;
+	}
+
+	/* Make sure resource isn't truncated */
+	if (sizeof(struct fw_rsc_imx_dsp) > avail ||
+	    sizeof(struct fw_rsc_imx_dsp) != imx_dsp_rsc->len) {
+		dev_dbg(dev, "Resource fw_rsc_imx_dsp is truncated.\n");
+		return RSC_IGNORED;
+	}
+
+	/*
+	 * If FW_RSC_NXP_S_MAGIC number is not found then
+	 * wait for fw_ready reply (default work flow)
+	 */
+	if (imx_dsp_rsc->magic_num != FW_RSC_NXP_S_MAGIC) {
+		dev_dbg(dev, "Invalid resource table magic number.\n");
+		return RSC_IGNORED;
+	}
+
+	/*
+	 * For now, in struct fw_rsc_imx_dsp, version 0,
+	 * only FEATURE_DONT_WAIT_FW_READY is valid.
+	 *
+	 * When adding new features, please upgrade version.
+	 */
+	if (imx_dsp_rsc->version > 0) {
+		dev_warn(dev, "Unexpected fw_rsc_imx_dsp version %d.\n",
+			 imx_dsp_rsc->version);
+		return RSC_IGNORED;
+	}
+
+	if (imx_dsp_rsc->features & FEATURE_DONT_WAIT_FW_READY)
+		priv->flags &= ~WAIT_FW_READY;
+
+	return RSC_HANDLED;
+}
+
 /*
  * Start function for rproc_ops
  *
@@ -335,8 +426,8 @@ static int imx_dsp_rproc_start(struct rproc *rproc)
 
 	if (ret)
 		dev_err(dev, "Failed to enable remote core!\n");
-	else
-		ret = imx_dsp_rproc_ready(rproc);
+	else if (priv->flags & WAIT_FW_READY)
+		return imx_dsp_rproc_ready(rproc);
 
 	return ret;
 }
@@ -936,6 +1027,7 @@ static const struct rproc_ops imx_dsp_rproc_ops = {
 	.kick		= imx_dsp_rproc_kick,
 	.load		= imx_dsp_rproc_elf_load_segments,
 	.parse_fw	= imx_dsp_rproc_parse_fw,
+	.handle_rsc	= imx_dsp_rproc_handle_rsc,
 	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
 	.sanity_check	= rproc_elf_sanity_check,
 	.get_boot_addr	= rproc_elf_get_boot_addr,
@@ -1053,6 +1145,8 @@ static int imx_dsp_rproc_probe(struct platform_device *pdev)
 	priv = rproc->priv;
 	priv->rproc = rproc;
 	priv->dsp_dcfg = dsp_dcfg;
+	/* By default, host waits for fw_ready reply */
+	priv->flags |= WAIT_FW_READY;
 
 	if (no_mailboxes)
 		imx_dsp_rproc_mbox_init = imx_dsp_rproc_mbox_no_alloc;
-- 
2.25.1

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