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| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-11-18 12:38:04 +0800 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-11-18 07:43:12 +0100 |
| commit | 978be6d711be237e0344eca21c3922ae88a240bc (patch) | |
| tree | aa1f40beeea1f27c2a4ac8c7a9a04d72957d2d75 /sound | |
| parent | 3f54aa5091f48e9d8ce6e99b248449d08acccb26 (diff) | |
| download | linux-978be6d711be237e0344eca21c3922ae88a240bc.tar.gz linux-978be6d711be237e0344eca21c3922ae88a240bc.tar.bz2 linux-978be6d711be237e0344eca21c3922ae88a240bc.zip | |
ALSA: intelhdmi - separate out infoframe checksum routine
And make it right when called for more than one times.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/patch_intelhdmi.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/sound/pci/hda/patch_intelhdmi.c b/sound/pci/hda/patch_intelhdmi.c index c5fd011567fb..d68dba9ac113 100644 --- a/sound/pci/hda/patch_intelhdmi.c +++ b/sound/pci/hda/patch_intelhdmi.c @@ -508,24 +508,35 @@ static void hdmi_clear_dip_buffers(struct hda_codec *codec, hda_nid_t pin_nid) #endif } +static void hdmi_checksum_audio_infoframe(struct hdmi_audio_infoframe *ai) +{ + u8 *bytes = (u8 *)ai; + u8 sum = 0; + int i; + + ai->checksum = 0; + + for (i = 0; i < sizeof(*ai); i++) + sum += bytes[i]; + + ai->checksum = - sum; +} + static void hdmi_fill_audio_infoframe(struct hda_codec *codec, hda_nid_t pin_nid, struct hdmi_audio_infoframe *ai) { - u8 *params = (u8 *)ai; - u8 sum = 0; + u8 *bytes = (u8 *)ai; int i; hdmi_debug_dip_size(codec, pin_nid); hdmi_clear_dip_buffers(codec, pin_nid); /* be paranoid */ - for (i = 0; i < sizeof(*ai); i++) - sum += params[i]; - ai->checksum = - sum; + hdmi_checksum_audio_infoframe(ai); hdmi_set_dip_index(codec, pin_nid, 0x0, 0x0); for (i = 0; i < sizeof(*ai); i++) - hdmi_write_dip_byte(codec, pin_nid, params[i]); + hdmi_write_dip_byte(codec, pin_nid, bytes[i]); } /* |