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From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     ohad@wizery.com, bjorn.andersson@linaro.org, loic.pallardy@st.com,
        arnaud.pouliquen@st.com, mcoquelin.stm32@gmail.com,
        alexandre.torgue@st.com
Cc:     linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-stm32@st-md-mailman.stormreply.com
Subject: [PATCH v5 11/11] remoteproc: stm32: Update M4 state in stm32_rproc_stop()
Date:   Tue,  7 Jul 2020 15:31:12 -0600
Message-Id: <20200707213112.928383-12-mathieu.poirier@linaro.org>
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Update the co-processor state in function stm32_rproc_stop() so that
it can be used in scenarios where the remoteproc core is attaching
to the M4.

Mainly based on the work published by Arnaud Pouliquen [1].

[1]. https://patchwork.kernel.org/project/linux-remoteproc/list/?series=239877

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
 drivers/remoteproc/stm32_rproc.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index 7145cd49616e..f4da42fc0eeb 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -504,6 +504,18 @@ static int stm32_rproc_stop(struct rproc *rproc)
 		}
 	}
 
+	/* update coprocessor state to OFF if available */
+	if (ddata->m4_state.map) {
+		err = regmap_update_bits(ddata->m4_state.map,
+					 ddata->m4_state.reg,
+					 ddata->m4_state.mask,
+					 M4_STATE_OFF);
+		if (err) {
+			dev_err(&rproc->dev, "failed to set copro state\n");
+			return err;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.25.1