linux-kernel - [PATCH v2 3/8] firmware: cs_dsp: Support DSPs that don't require firmware download

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Date:   Mon, 13 Mar 2023 15:49:50 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <broonie@...nel.org>, <pierre-louis.bossart@...ux.intel.com>
CC:     <peter.ujfalusi@...ux.intel.com>,
        <yung-chuan.liao@...ux.intel.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH v2 3/8] firmware: cs_dsp: Support DSPs that don't require firmware download

From: Simon Trimmer <simont@...nsource.cirrus.com>

When a DSP can self-boot from ROM it is not necessary to download
firmware during the powering up sequence.

A DSP that required firmware download would fail in a previous
configuration step if firmware was not available.

Signed-off-by: Simon Trimmer <simont@...nsource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 drivers/firmware/cirrus/cs_dsp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/cirrus/cs_dsp.c b/drivers/firmware/cirrus/cs_dsp.c
index 97b73a254380..513136a924cf 100644
--- a/drivers/firmware/cirrus/cs_dsp.c
+++ b/drivers/firmware/cirrus/cs_dsp.c
@@ -1301,6 +1301,9 @@ static int cs_dsp_load(struct cs_dsp *dsp, const struct firmware *firmware,
 	int regions = 0;
 	int ret, offset, type;
 
+	if (!firmware)
+		return 0;
+
 	ret = -EINVAL;
 
 	pos = sizeof(*header) + sizeof(*adsp1_sizes) + sizeof(*footer);
-- 
2.30.2