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From:   "Iuliana Prodan (OSS)" <iuliana.prodan@oss.nxp.com>
To:     Bjorn Andersson <andersson@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
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Cc:     linux-imx <linux-imx@nxp.com>, linux-remoteproc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Pengutronix Kernel Team <kernel@pengutronix.de>
Subject: [PATCH v2] remoteproc: imx_dsp_rproc: add module parameter to ignore ready flag from remote processor
Date:   Tue, 17 Jan 2023 11:26:47 +0200
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From: Iuliana Prodan <iuliana.prodan@nxp.com>

There are cases when we want to test a simple "hello world"
application on the DSP and we don't have IPC between the cores.
Therefore, skip the wait for remote processor to start.

Added "ignoreready" flag while inserting the module to ignore
remote processor reply after start.
By default, this is off - do not ignore reply from rproc.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>

---
Changes since v1
- change BIT(31) to BIT(1) for REMOTE_SKIP_WAIT

---
 drivers/remoteproc/imx_dsp_rproc.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
index 95da1cbefacf..22e2ef068c67 100644
--- a/drivers/remoteproc/imx_dsp_rproc.c
+++ b/drivers/remoteproc/imx_dsp_rproc.c
@@ -26,9 +26,20 @@
 #include "remoteproc_elf_helpers.h"
 #include "remoteproc_internal.h"
 
+#define IMX_DSP_IGNORE_REMOTE_READY		0
+
+/*
+ * Module parameters
+ */
+static unsigned int imx_dsp_rproc_ignoreready = IMX_DSP_IGNORE_REMOTE_READY;
+module_param_named(ignoreready, imx_dsp_rproc_ignoreready, int, 0644);
+MODULE_PARM_DESC(ignoreready,
+		 "Ignore remote proc reply after start, default is 0 (off).");
+
 #define DSP_RPROC_CLK_MAX			5
 
 #define REMOTE_IS_READY				BIT(0)
+#define REMOTE_SKIP_WAIT			BIT(1)
 #define REMOTE_READY_WAIT_MAX_RETRIES		500
 
 /* att flags */
@@ -285,6 +296,9 @@ static int imx_dsp_rproc_ready(struct rproc *rproc)
 	if (!priv->rxdb_ch)
 		return 0;
 
+	if (priv->flags & REMOTE_SKIP_WAIT)
+		return 0;
+
 	for (i = 0; i < REMOTE_READY_WAIT_MAX_RETRIES; i++) {
 		if (priv->flags & REMOTE_IS_READY)
 			return 0;
@@ -903,6 +917,9 @@ static int imx_dsp_rproc_probe(struct platform_device *pdev)
 	priv->rproc = rproc;
 	priv->dsp_dcfg = dsp_dcfg;
 
+	if (imx_dsp_rproc_ignoreready)
+		priv->flags |= REMOTE_SKIP_WAIT;
+
 	dev_set_drvdata(dev, rproc);
 
 	INIT_WORK(&priv->rproc_work, imx_dsp_rproc_vq_work);
-- 
2.17.1