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authorTakashi Iwai <tiwai@suse.de>2019-08-07 20:32:08 +0200
committerTakashi Iwai <tiwai@suse.de>2019-08-08 16:36:18 +0200
commit19abfefd4c7604993d1c31e098a3f48bdafe334d (patch)
treea0c62c7b642d4d1b02058548f44e94e485c44894 /include/sound/hdaudio_ext.h
parent619a1f195f93276dc8c6e33fe057e007adc9c288 (diff)
downloadlinux-19abfefd4c7604993d1c31e098a3f48bdafe334d.tar.bz2
ALSA: hda: Direct MMIO accesses
HD-audio drivers access to the mmio registers indirectly via the corresponding bus->io_ops callbacks. This is because some platform (notably Tegra SoC) requires the word-aligned access. But it's rather a rare case, and other platforms suffer from the penalties by indirect calls unnecessarily. This patch is an attempt to optimize and cleanup for this situation. Now the special aligned access is used only when a new kconfig CONFIG_SND_HDA_ALIGNED_MMIO is set. And the HD-audio core itself provides the aligned MMIO access helpers instead of the driver side. If Kconfig isn't set (as default), the standard helpers like readl() or writel() are used directly. A couple of places in ASoC Intel drivers have the access via io_ops reg_writel(), and they are replaced with the direct writel() calls. And now with this patch, the whole bus->io_ops becomes empty, so it's dropped completely. The bus initialization functions are changed accordingly as well to drop the whole bus->io_ops. Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound/hdaudio_ext.h')
-rw-r--r--include/sound/hdaudio_ext.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/sound/hdaudio_ext.h b/include/sound/hdaudio_ext.h
index f34aced69ca8..ef88b20c7b0a 100644
--- a/include/sound/hdaudio_ext.h
+++ b/include/sound/hdaudio_ext.h
@@ -6,7 +6,6 @@
int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
const struct hdac_bus_ops *ops,
- const struct hdac_io_ops *io_ops,
const struct hdac_ext_bus_ops *ext_ops);
void snd_hdac_ext_bus_exit(struct hdac_bus *bus);