regmap: Cache register and value sizes for debugfs

No point in calculating them every time.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index ac869d2..1abcd27 100644 (file)
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -50,6 +50,10 @@ struct regmap {
 #ifdef CONFIG_DEBUG_FS
        struct dentry *debugfs;
        const char *debugfs_name;
+
+       unsigned int debugfs_reg_len;
+       unsigned int debugfs_val_len;
+       unsigned int debugfs_tot_len;
 #endif
 
        unsigned int max_register;

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index f4b9dd0..00fbd58 100644 (file)
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -60,7 +60,6 @@ static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
                                   unsigned int to, char __user *user_buf,
                                   size_t count, loff_t *ppos)
 {
-       int reg_len, val_len, tot_len;
        size_t buf_pos = 0;
        loff_t p = 0;
        ssize_t ret;
@@ -76,9 +75,13 @@ static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
                return -ENOMEM;
 
        /* Calculate the length of a fixed format  */
-       reg_len = regmap_calc_reg_len(map->max_register, buf, count);
-       val_len = 2 * map->format.val_bytes;
-       tot_len = reg_len + val_len + 3;      /* : \n */
+       if (!map->debugfs_tot_len) {
+               map->debugfs_reg_len = regmap_calc_reg_len(map->max_register,
+                                                          buf, count);
+               map->debugfs_val_len = 2 * map->format.val_bytes;
+               map->debugfs_tot_len = map->debugfs_reg_len +
+                       map->debugfs_val_len + 3;      /* : \n */
+       }
 
        for (i = from; i <= to; i += map->reg_stride) {
                if (!regmap_readable(map, i))
@@ -90,26 +93,27 @@ static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
                /* If we're in the region the user is trying to read */
                if (p >= *ppos) {
                        /* ...but not beyond it */
-                       if (buf_pos >= count - 1 - tot_len)
+                       if (buf_pos >= count - 1 - map->debugfs_tot_len)
                                break;
 
                        /* Format the register */
                        snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
-                                reg_len, i - from);
-                       buf_pos += reg_len + 2;
+                                map->debugfs_reg_len, i - from);
+                       buf_pos += map->debugfs_reg_len + 2;
 
                        /* Format the value, write all X if we can't read */
                        ret = regmap_read(map, i, &val);
                        if (ret == 0)
                                snprintf(buf + buf_pos, count - buf_pos,
-                                        "%.*x", val_len, val);
+                                        "%.*x", map->debugfs_val_len, val);
                        else
-                               memset(buf + buf_pos, 'X', val_len);
+                               memset(buf + buf_pos, 'X',
+                                      map->debugfs_val_len);
                        buf_pos += 2 * map->format.val_bytes;
 
                        buf[buf_pos++] = '\n';
                }
-               p += tot_len;
+               p += map->debugfs_tot_len;
        }
 
        ret = buf_pos;