[media] xc4000: simplified seek_firmware()

This patch simplifies the code in seek_firmware().

Signed-off-by: Istvan Varga <istvan_v@mailbox.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/common/tuners/xc4000.c b/drivers/media/common/tuners/xc4000.c
index 229a215..811519a 100644 (file)
--- a/drivers/media/common/tuners/xc4000.c
+++ b/drivers/media/common/tuners/xc4000.c
@@ -605,8 +605,8 @@ static int seek_firmware(struct dvb_frontend *fe, unsigned int type,
                         v4l2_std_id *id)
 {
        struct xc4000_priv *priv = fe->tuner_priv;
-       int                 i, best_i = -1, best_nr_matches = 0;
-       unsigned int        type_mask = 0;
+       int             i, best_i = -1;
+       unsigned int    best_nr_diffs = 255U;
 
        if (!priv->firm) {
                printk("Error! firmware not loaded\n");
@@ -616,63 +616,42 @@ static int seek_firmware(struct dvb_frontend *fe, unsigned int type,
        if (((type & ~SCODE) == 0) && (*id == 0))
                *id = V4L2_STD_PAL;
 
-       if (type & BASE)
-               type_mask = BASE_TYPES;
-       else if (type & SCODE) {
-               type &= SCODE_TYPES;
-               type_mask = SCODE_TYPES & ~HAS_IF;
-       } else if (type & DTV_TYPES)
-               type_mask = DTV_TYPES;
-       else if (type & STD_SPECIFIC_TYPES)
-               type_mask = STD_SPECIFIC_TYPES;
-
-       type &= type_mask;
-
-       if (!(type & SCODE))
-               type_mask = ~0;
-
-       /* Seek for exact match */
-       for (i = 0; i < priv->firm_size; i++) {
-               if ((type == (priv->firm[i].type & type_mask)) &&
-                   (*id == priv->firm[i].id))
-                       goto found;
-       }
-
        /* Seek for generic video standard match */
        for (i = 0; i < priv->firm_size; i++) {
-               v4l2_std_id match_mask;
-               int nr_matches;
-
-               if (type != (priv->firm[i].type & type_mask))
+               v4l2_std_id     id_diff_mask =
+                       (priv->firm[i].id ^ (*id)) & (*id);
+               unsigned int    type_diff_mask =
+                       (priv->firm[i].type ^ type)
+                       & (BASE_TYPES | DTV_TYPES | LCD | NOGD | MONO | SCODE);
+               unsigned int    nr_diffs;
+
+               if (type_diff_mask
+                   & (BASE | INIT1 | FM | DTV6 | DTV7 | DTV78 | DTV8 | SCODE))
                        continue;
 
-               match_mask = *id & priv->firm[i].id;
-               if (!match_mask)
-                       continue;
-
-               if ((*id & match_mask) == *id)
-                       goto found; /* Supports all the requested standards */
+               nr_diffs = hweight64(id_diff_mask) + hweight32(type_diff_mask);
+               if (!nr_diffs)  /* Supports all the requested standards */
+                       goto found;
 
-               nr_matches = hweight64(match_mask);
-               if (nr_matches > best_nr_matches) {
-                       best_nr_matches = nr_matches;
+               if (nr_diffs < best_nr_diffs) {
+                       best_nr_diffs = nr_diffs;
                        best_i = i;
                }
        }
 
-       if (best_nr_matches > 0) {
-               printk("Selecting best matching firmware (%d bits) for "
-                         "type=", best_nr_matches);
+       /* FIXME: Would make sense to seek for type "hint" match ? */
+       if (best_i < 0) {
+               i = -ENOENT;
+               goto ret;
+       }
+
+       if (best_nr_diffs > 0U) {
+               printk("Selecting best matching firmware (%u bits differ) for "
+                      "type=", best_nr_diffs);
                printk("(%x), id %016llx:\n", type, (unsigned long long)*id);
                i = best_i;
-               goto found;
        }
 
-       /*FIXME: Would make sense to seek for type "hint" match ? */
-
-       i = -ENOENT;
-       goto ret;
-
 found:
        *id = priv->firm[i].id;