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drm/edid: split drm_edid block count helper

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Split the drm_edid block count helper to a base version that reports the
block count indicated by EDID contents, and another on top that limits
the block count based on size allocated for the EDID.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/a7d63878c7fb3dd6f3b987f5257897113797b94f.1666614699.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula
2022-10-24 15:33:35 +03:00
parent 019b938748
commit b16c9e6c7d
1 changed files with 11 additions and 4 deletions
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15
drivers/gpu/drm/drm_edid.c
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@@ -1613,7 +1613,8 @@ static const void *edid_extension_block_data(const struct edid *edid, int index)
return edid_block_data(edid, index + 1);
}
static int drm_edid_block_count(const struct drm_edid *drm_edid)
/* EDID block count indicated in EDID, may exceed allocated size */
static int __drm_edid_block_count(const struct drm_edid *drm_edid)
{
int num_blocks;
@@ -1633,12 +1634,18 @@ static int drm_edid_block_count(const struct drm_edid *drm_edid)
num_blocks = eeodb;
}
/* Limit by allocated size */
num_blocks = min(num_blocks, (int)drm_edid->size / EDID_LENGTH);
return num_blocks;
}
/* EDID block count, limited by allocated size */
static int drm_edid_block_count(const struct drm_edid *drm_edid)
{
/* Limit by allocated size */
return min(__drm_edid_block_count(drm_edid),
(int)drm_edid->size / EDID_LENGTH);
}
/* EDID extension block count, limited by allocated size */
static int drm_edid_extension_block_count(const struct drm_edid *drm_edid)
{
return drm_edid_block_count(drm_edid) - 1;