ALSA: hda - compute checksum in HDMI audio infoframe

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/sound/pci/hda/patch_intelhdmi.c b/sound/pci/hda/patch_intelhdmi.c
index f2610d67e187..90b11374a0a8 100644
--- a/sound/pci/hda/patch_intelhdmi.c
+++ b/sound/pci/hda/patch_intelhdmi.c
@@ -366,11 +366,16 @@ static void hdmi_fill_audio_infoframe(struct hda_codec *codec,
                                         struct hdmi_audio_infoframe *ai)
 {
         u8 *params = (u8 *)ai;
+        u8 sum = 0;
         int i;
 
         hdmi_debug_dip_size(codec);
         hdmi_clear_dip_buffers(codec); /* be paranoid */
 
+        for (i = 0; i < sizeof(ai); i++)
+                sum += params[i];
+        ai->checksum = - sum;
+
         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]);