linux-kernel - [PATCH 5.5 168/257] remoteproc: qcom_q6v5_mss: Reload the mba region on coredump

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Message-Id: <20200416131347.463958577@linuxfoundation.org>
Date:   Thu, 16 Apr 2020 15:23:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sibi Sankar <sibis@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH 5.5 168/257] remoteproc: qcom_q6v5_mss: Reload the mba region on coredump

From: Sibi Sankar <sibis@...eaurora.org>

commit d96f2571dc84d128cacf1944f4ecc87834c779a6 upstream.

On secure devices after a wdog/fatal interrupt, the mba region has to be
refreshed in order to prevent the following errors during mba load.

Err Logs:
remoteproc remoteproc2: stopped remote processor 4080000.remoteproc
qcom-q6v5-mss 4080000.remoteproc: PBL returned unexpected status -284031232
qcom-q6v5-mss 4080000.remoteproc: PBL returned unexpected status -284031232
....
qcom-q6v5-mss 4080000.remoteproc: PBL returned unexpected status -284031232
qcom-q6v5-mss 4080000.remoteproc: MBA booted, loading mpss

Fixes: 7dd8ade24dc2a ("remoteproc: qcom: q6v5-mss: Add custom dump function for modem")
Cc: stable@...r.kernel.org
Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
Tested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Link: https://lore.kernel.org/r/20200304194729.27979-4-sibis@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/remoteproc/qcom_q6v5_mss.c |   19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -916,6 +916,23 @@ static void q6v5_mba_reclaim(struct q6v5
 	}
 }
 
+static int q6v5_reload_mba(struct rproc *rproc)
+{
+	struct q6v5 *qproc = rproc->priv;
+	const struct firmware *fw;
+	int ret;
+
+	ret = request_firmware(&fw, rproc->firmware, qproc->dev);
+	if (ret < 0)
+		return ret;
+
+	q6v5_load(rproc, fw);
+	ret = q6v5_mba_load(qproc);
+	release_firmware(fw);
+
+	return ret;
+}
+
 static int q6v5_mpss_load(struct q6v5 *qproc)
 {
 	const struct elf32_phdr *phdrs;
@@ -1074,7 +1091,7 @@ static void qcom_q6v5_dump_segment(struc
 
 	/* Unlock mba before copying segments */
 	if (!qproc->dump_mba_loaded) {
-		ret = q6v5_mba_load(qproc);
+		ret = q6v5_reload_mba(rproc);
 		if (!ret) {
 			/* Reset ownership back to Linux to copy segments */
 			ret = q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm,