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| author | Maxime Ripard <maxime@cerno.tech> | 2022-07-11 19:39:16 +0200 |
|---|---|---|
| committer | Maxime Ripard <maxime@cerno.tech> | 2022-07-13 10:46:10 +0200 |
| commit | 0c9d0ddd9cf4b43f8b3faf752c5a1aaa665ed099 (patch) | |
| tree | 5f40eeafd34748b2a08fe9e341883a900ad0e60a /drivers/gpu/drm/vc4/vc4_hdmi.c | |
| parent | af8a3b125b682c4c582bb25342af4759d9b4a1e5 (diff) | |
| download | linux-stable-0c9d0ddd9cf4b43f8b3faf752c5a1aaa665ed099.tar.gz linux-stable-0c9d0ddd9cf4b43f8b3faf752c5a1aaa665ed099.tar.bz2 linux-stable-0c9d0ddd9cf4b43f8b3faf752c5a1aaa665ed099.zip | |
drm/vc4: hdmi: Move audio structure offset checks
The HDMI driver unbind hook doesn't have any ALSA-related code anymore, so
let's move the ALSA sanity checks and comments we have to some other part
of the driver dedicated to ALSA.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-47-maxime@cerno.tech
Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_hdmi.c')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_hdmi.c | 40 |
1 files changed, 20 insertions, 20 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 6275db463afd..a130b7d48e46 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -2076,6 +2076,26 @@ static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi) int index, len; int ret; + /* + * ASoC makes it a bit hard to retrieve a pointer to the + * vc4_hdmi structure. Registering the card will overwrite our + * device drvdata with a pointer to the snd_soc_card structure, + * which can then be used to retrieve whatever drvdata we want + * to associate. + * + * However, that doesn't fly in the case where we wouldn't + * register an ASoC card (because of an old DT that is missing + * the dmas properties for example), then the card isn't + * registered and the device drvdata wouldn't be set. + * + * We can deal with both cases by making sure a snd_soc_card + * pointer and a vc4_hdmi structure are pointing to the same + * memory address, so we can treat them indistinctly without any + * issue. + */ + BUILD_BUG_ON(offsetof(struct vc4_hdmi_audio, card) != 0); + BUILD_BUG_ON(offsetof(struct vc4_hdmi, audio) != 0); + if (!of_find_property(dev->of_node, "dmas", &len) || !len) { dev_warn(dev, "'dmas' DT property is missing or empty, no HDMI audio\n"); @@ -3082,26 +3102,6 @@ err_disable_runtime_pm: static void vc4_hdmi_unbind(struct device *dev, struct device *master, void *data) { - /* - * ASoC makes it a bit hard to retrieve a pointer to the - * vc4_hdmi structure. Registering the card will overwrite our - * device drvdata with a pointer to the snd_soc_card structure, - * which can then be used to retrieve whatever drvdata we want - * to associate. - * - * However, that doesn't fly in the case where we wouldn't - * register an ASoC card (because of an old DT that is missing - * the dmas properties for example), then the card isn't - * registered and the device drvdata wouldn't be set. - * - * We can deal with both cases by making sure a snd_soc_card - * pointer and a vc4_hdmi structure are pointing to the same - * memory address, so we can treat them indistinctly without any - * issue. - */ - BUILD_BUG_ON(offsetof(struct vc4_hdmi_audio, card) != 0); - BUILD_BUG_ON(offsetof(struct vc4_hdmi, audio) != 0); - pm_runtime_disable(dev); } |