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drm/edid: Break out reading block 0 of the EDID

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A future change wants to be able to read just block 0 of the EDID, so
break it out of drm_do_get_edid() into a sub-function.

This is intended to be a no-op change--just code movement.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210914132020.v5.2.I62e76a034ac78c994d40a23cd4ec5aeee56fa77c@changeid
This commit is contained in:
Douglas Anderson 2021-09-14 13:21:49 -07:00
parent 29145a5668
commit bac9c29482
1 changed files with 45 additions and 18 deletions
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63
drivers/gpu/drm/drm_edid.c
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@ -1905,6 +1905,44 @@ int drm_add_override_edid_modes(struct drm_connector *connector)
}
EXPORT_SYMBOL(drm_add_override_edid_modes);
static struct edid *drm_do_get_edid_base_block(
int (*get_edid_block)(void *data, u8 *buf, unsigned int block,
size_t len),
void *data, bool *edid_corrupt, int *null_edid_counter)
{
int i;
void *edid;
edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (edid == NULL)
return NULL;
/* base block fetch */
for (i = 0; i < 4; i++) {
if (get_edid_block(data, edid, 0, EDID_LENGTH))
goto out;
if (drm_edid_block_valid(edid, 0, false, edid_corrupt))
break;
if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) {
if (null_edid_counter)
(*null_edid_counter)++;
goto carp;
}
}
if (i == 4)
goto carp;
return edid;
carp:
kfree(edid);
return ERR_PTR(-EINVAL);
out:
kfree(edid);
return NULL;
}
/**
* drm_do_get_edid - get EDID data using a custom EDID block read function
* @connector: connector we're probing
@ -1938,25 +1976,16 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
if (override)
return override;
if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
edid = (u8 *)drm_do_get_edid_base_block(get_edid_block, data,
&connector->edid_corrupt,
&connector->null_edid_counter);
if (IS_ERR_OR_NULL(edid)) {
if (IS_ERR(edid))
connector_bad_edid(connector, edid, 1);
return NULL;
/* base block fetch */
for (i = 0; i < 4; i++) {
if (get_edid_block(data, edid, 0, EDID_LENGTH))
goto out;
if (drm_edid_block_valid(edid, 0, false,
&connector->edid_corrupt))
break;
if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) {
connector->null_edid_counter++;
goto carp;
}
}
if (i == 4)
goto carp;
/* if there's no extensions, we're done */
/* if there's no extensions or no connector, we're done */
valid_extensions = edid[0x7e];
if (valid_extensions == 0)
return (struct edid *)edid;
@ -2010,8 +2039,6 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
return (struct edid *)edid;
carp:
connector_bad_edid(connector, edid, 1);
out:
kfree(edid);
return NULL;