| Message ID | 20210901131531.v3.2.I62e76a034ac78c994d40a23cd4ec5aeee56fa77c@changeid (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | eDP: Support probing eDP panels dynamically instead of hardcoding | expand |
On Wed, 01 Sep 2021, Douglas Anderson <dianders@chromium.org> wrote: > 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> > --- > > (no changes since v1) > > drivers/gpu/drm/drm_edid.c | 62 +++++++++++++++++++++++++++----------- > 1 file changed, 44 insertions(+), 18 deletions(-) > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index 6325877c5fd6..a22c38482a90 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -1905,6 +1905,43 @@ int drm_add_override_edid_modes(struct drm_connector *connector) > } > EXPORT_SYMBOL(drm_add_override_edid_modes); > > +static struct edid *drm_do_get_edid_blk0( Maybe base_block instead of blk0? > + 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; > + u8 *edid; With void *edid, this function wouldn't need the cast internally. > + > + if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) > + return NULL; Could split the allocation and NULL check to two separate lines per coding style, while at it? BR, Jani. > + > + /* 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 (struct edid *)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 +1975,16 @@ 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_blk0(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 +2038,6 @@ 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;
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 6325877c5fd6..a22c38482a90 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -1905,6 +1905,43 @@ int drm_add_override_edid_modes(struct drm_connector *connector) } EXPORT_SYMBOL(drm_add_override_edid_modes); +static struct edid *drm_do_get_edid_blk0( + 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; + u8 *edid; + + if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == 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 (struct edid *)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 +1975,16 @@ 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_blk0(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 +2038,6 @@ 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;
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> --- (no changes since v1) drivers/gpu/drm/drm_edid.c | 62 +++++++++++++++++++++++++++----------- 1 file changed, 44 insertions(+), 18 deletions(-)