remoteproc: qcom_q6v5_mss: support loading MBN file on msm8974

On MSM8974 / APQ8074, MSM8226 and MSM8926 the MSS requires loading raw
MBA image instead of the ELF file. Skip the ELF headers if mba.mbn was
specified as the firmware image.

Fixes: a5a4e02d083d ("remoteproc: qcom: Add support for parsing fw dt bindings")
Signed-off-by: Dmitry Baryshkov <[e-mail]>
Signed-off-by: Dmitry Baryshkov <[e-mail]>
Tested-by: Luca Weiss <[e-mail]> # msm8974pro-fairphone-fp2
Link: https://lore.kernel.org/r/[e-mail]
[bjorn: Unwrapped the long memcpy line, to taste]
Signed-off-by: Bjorn Andersson <[e-mail]>

drivers/remoteproc/qcom_q6v5_mss.c

···
 	release_firmware(dp_fw);
 }
 
+#define MSM8974_B00_OFFSET 0x1000
+
 static int q6v5_load(struct rproc *rproc, const struct firmware *fw)
 {
 	struct q6v5 *qproc = rproc->priv;
···
 		return -EBUSY;
 	}
 
-	memcpy(mba_region, fw->data, fw->size);
+	if ((qproc->version == MSS_MSM8974 ||
+	     qproc->version == MSS_MSM8226 ||
+	     qproc->version == MSS_MSM8926) &&
+	    fw->size > MSM8974_B00_OFFSET &&
+	    !memcmp(fw->data, ELFMAG, SELFMAG))
+		memcpy(mba_region, fw->data + MSM8974_B00_OFFSET, fw->size - MSM8974_B00_OFFSET);
+	else
+		memcpy(mba_region, fw->data, fw->size);
 	q6v5_debug_policy_load(qproc, mba_region);
 	memunmap(mba_region);