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drm/mgag200: Implement connector's get_modes with helper 

Provide drm_connector_helper_get_modes_from_ddc() to implement the
connector's get_modes callback. The new helper updates the connector
from DDC-provided EDID data.

v2:
	* clear property if EDID is NULL in helper

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220516134343.6085-4-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2022-05-16 15:43:39 +02:00
parent d50f74790b
commit 16f1456466
3 changed files with 42 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/gpu/drm/drm_probe_helper.c
View File

@ -964,3 +964,39 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev)
return changed;
}
EXPORT_SYMBOL(drm_helper_hpd_irq_event);
/**
* drm_connector_helper_get_modes_from_ddc - Updates the connector's EDID
* property from the connector's
* DDC channel
* @connector: The connector
*
* Returns:
* The number of detected display modes.
*
* Uses a connector's DDC channel to retrieve EDID data and update the
* connector's EDID property and display modes. Drivers can use this
* function to implement struct &drm_connector_helper_funcs.get_modes
* for connectors with a DDC channel.
*/
int drm_connector_helper_get_modes_from_ddc(struct drm_connector *connector)
{
struct edid *edid;
int count = 0;
if (!connector->ddc)
return 0;
edid = drm_get_edid(connector, connector->ddc);
// clears property if EDID is NULL
drm_connector_update_edid_property(connector, edid);
if (edid) {
count = drm_add_edid_modes(connector, edid);
kfree(edid);
}
return count;
}
EXPORT_SYMBOL(drm_connector_helper_get_modes_from_ddc);

17
drivers/gpu/drm/mgag200/mgag200_mode.c
View File

@ -689,26 +689,17 @@ static void mgag200_disable_display(struct mga_device *mdev)
* Connector
*/
static int mga_vga_get_modes(struct drm_connector *connector)
static int mgag200_vga_connector_helper_get_modes(struct drm_connector *connector)
{
struct mga_device *mdev = to_mga_device(connector->dev);
struct mga_connector *mga_connector = to_mga_connector(connector);
struct edid *edid;
int ret = 0;
int ret;
/*
* Protect access to I/O registers from concurrent modesetting
* by acquiring the I/O-register lock.
*/
mutex_lock(&mdev->rmmio_lock);
edid = drm_get_edid(connector, &mga_connector->i2c->adapter);
if (edid) {
drm_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
kfree(edid);
}
ret = drm_connector_helper_get_modes_from_ddc(connector);
mutex_unlock(&mdev->rmmio_lock);
return ret;
@ -828,7 +819,7 @@ static void mga_connector_destroy(struct drm_connector *connector)
}
static const struct drm_connector_helper_funcs mga_vga_connector_helper_funcs = {
.get_modes = mga_vga_get_modes,
.get_modes = mgag200_vga_connector_helper_get_modes,
.mode_valid = mga_vga_mode_valid,
};

2
include/drm/drm_probe_helper.h
View File

@ -26,4 +26,6 @@ void drm_kms_helper_poll_disable(struct drm_device *dev);
void drm_kms_helper_poll_enable(struct drm_device *dev);
bool drm_kms_helper_is_poll_worker(void);
int drm_connector_helper_get_modes_from_ddc(struct drm_connector *connector);
#endif