remoteproc: qcom_q6v5_mss: Reload the mba region on coredump

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: 7dd8ade2 ("remoteproc: qcom: q6v5-mss: Add custom dump function for modem")
Cc: stable@vger.kernel.org
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200304194729.27979-4-sibis@codeaurora.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/remoteproc/qcom_q6v5_mss.c

@@ -1042,6 +1042,23 @@ static void q6v5_mba_reclaim(struct q6v5 *qproc)
 	}
 }
 
+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;
@@ -1221,7 +1238,7 @@ static void qcom_q6v5_dump_segment(struct rproc *rproc,
 
 	/* 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,