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ASoC: cs35l56: Don't overwrite a patched firmware

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Only attempt to download wmfw/bin files to a non-secured part if
it reports FIRMWARE_MISSING. If FIRMWARE_MISSING is false the
firmware has already been patched and overwriting the patch could
corrupt the running firmware.

For a secured part the wmfw/bin can be downloaded even if
FIRMWARE_MISSING is false, because they will only patch tunings.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230815124826.5447-3-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Richard Fitzgerald 2023-08-15 13:48:26 +01:00 committed by Mark Brown
parent 62ddad4238
commit 67bd793ba5
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 15 additions and 2 deletions
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17
sound/soc/codecs/cs35l56.c
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@ -665,8 +665,17 @@ static void cs35l56_secure_patch(struct cs35l56_private *cs35l56)
static void cs35l56_patch(struct cs35l56_private *cs35l56)
{
unsigned int firmware_missing;
int ret;
ret = regmap_read(cs35l56->base.regmap, CS35L56_PROTECTION_STATUS, &firmware_missing);
if (ret) {
dev_err(cs35l56->base.dev, "Failed to read PROTECTION_STATUS: %d\n", ret);
return;
}
firmware_missing &= CS35L56_FIRMWARE_MISSING;
/*
* Disable SoundWire interrupts to prevent race with IRQ work.
* Setting sdw_irq_no_unmask prevents the handler re-enabling
@ -685,8 +694,12 @@ static void cs35l56_patch(struct cs35l56_private *cs35l56)
if (ret)
goto err;
/* Use wm_adsp to load and apply the firmware patch and coefficient files */
ret = wm_adsp_power_up(&cs35l56->dsp, true);
/*
* Use wm_adsp to load and apply the firmware patch and coefficient files,
* but only if firmware is missing. If firmware is already patched just
* power-up wm_adsp without downloading firmware.
*/
ret = wm_adsp_power_up(&cs35l56->dsp, !!firmware_missing);
if (ret) {
dev_dbg(cs35l56->base.dev, "%s: wm_adsp_power_up ret %d\n", __func__, ret);
goto err;