From 23b03867a2201099f598a6d7800f7837620dfa94 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 13 Mar 2020 18:20:49 +0200 Subject: [PATCH] drm/edid: Return DispID length from drm_find_displayid_extension() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit As with the byte offset (idx) drm_find_displayid_extension() is the only one who actually knows how much data the resulting DispID block can contain. So return the length from therein instead of assuming it's the EDID block length all over. Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20200313162054.16009-5-ville.syrjala@linux.intel.com Reviewed-by: Alex Deucher --- drivers/gpu/drm/drm_edid.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index c9179df82627..d783c5f958b3 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3212,13 +3212,15 @@ static u8 *drm_find_edid_extension(const struct edid *edid, int ext_id) } -static u8 *drm_find_displayid_extension(const struct edid *edid, int *idx) +static u8 *drm_find_displayid_extension(const struct edid *edid, + int *length, int *idx) { u8 *displayid = drm_find_edid_extension(edid, DISPLAYID_EXT); if (!displayid) return NULL; + *length = EDID_LENGTH; *idx = 1; return displayid; @@ -3227,8 +3229,7 @@ static u8 *drm_find_displayid_extension(const struct edid *edid, int *idx) static u8 *drm_find_cea_extension(const struct edid *edid) { int ret; - int idx; - int length = EDID_LENGTH; + int length, idx; struct displayid_block *block; u8 *cea; u8 *displayid; @@ -3239,7 +3240,7 @@ static u8 *drm_find_cea_extension(const struct edid *edid) return cea; /* CEA blocks can also be found embedded in a DisplayID block */ - displayid = drm_find_displayid_extension(edid, &idx); + displayid = drm_find_displayid_extension(edid, &length, &idx); if (!displayid) return NULL; @@ -5188,12 +5189,11 @@ static int add_displayid_detailed_modes(struct drm_connector *connector, { u8 *displayid; int ret; - int idx; - int length = EDID_LENGTH; + int length, idx; struct displayid_block *block; int num_modes = 0; - displayid = drm_find_displayid_extension(edid, &idx); + displayid = drm_find_displayid_extension(edid, &length, &idx); if (!displayid) return 0; @@ -5881,17 +5881,17 @@ static void drm_get_displayid(struct drm_connector *connector, struct edid *edid) { void *displayid = NULL; - int idx; + int length, idx; int ret; connector->has_tile = false; - displayid = drm_find_displayid_extension(edid, &idx); + displayid = drm_find_displayid_extension(edid, &length, &idx); if (!displayid) { /* drop reference to any tile group we had */ goto out_drop_ref; } - ret = drm_parse_display_id(connector, displayid, EDID_LENGTH, idx); + ret = drm_parse_display_id(connector, displayid, length, idx); if (ret < 0) goto out_drop_ref; if (!connector->has_tile)