ASoC: SOF: add a pointer to download repo in case FW request fails

The SOF firmware and topology files are not distributed via
linux-firmware. To help debugging cases where correct firmware is
not installed, print a pointer to the official upstream repository
for Sound Open Firmware releases.

BugLink: https://github.com/thesofproject/sof/issues/3665Reported-by: NBruce Perens <bruce@perens.com>
Signed-off-by: NKai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: NRanjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: NMarc Herbert <marc.herbert@intel.com>
Reviewed-by: NLiam Girdwood <liam.r.girdwood@intel.com>
Link: https://lore.kernel.org/r/20210127122358.1014458-1-kai.vehmanen@linux.intel.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/sof/loader.c

@@ -731,6 +731,8 @@ int snd_sof_load_firmware_raw(struct snd_sof_dev *sdev)
 	if (ret < 0) {
 		dev_err(sdev->dev, "error: request firmware %s failed err: %d\n",
 			fw_filename, ret);
+		dev_err(sdev->dev,
+			"you may need to download the firmware from https://github.com/thesofproject/sof-bin/\n");
 		goto err;
 	} else {
 		dev_dbg(sdev->dev, "request_firmware %s successful\n",

sound/soc/sof/topology.c

@@ -3740,6 +3740,8 @@ int snd_sof_load_topology(struct snd_soc_component *scomp, const char *file)
 	if (ret < 0) {
 		dev_err(scomp->dev, "error: tplg request firmware %s failed err: %d\n",
 			file, ret);
+		dev_err(scomp->dev,
+			"you may need to download the firmware from https://github.com/thesofproject/sof-bin/\n");
 		return ret;
 	}