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ALSA: intelhdmi - separate out infoframe checksum routine

Browse source 
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>
This commit is contained in:
Wu Fengguang 2009-11-18 12:38:04 +08:00 committed by Takashi Iwai
parent 3f54aa5091
commit 978be6d711
1 changed files with 17 additions and 6 deletions
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23
sound/pci/hda/patch_intelhdmi.c
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@ -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]);
}
/*