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| author | Louis Chauvet <louis.chauvet@bootlin.com> | 2025-10-16 20:56:08 +0300 |
|---|---|---|
| committer | Luca Ceresoli <luca.ceresoli@bootlin.com> | 2025-10-22 14:19:25 +0300 |
| commit | ee5c2c7d4bb6998ff11778436acbdc3154ce74ef (patch) | |
| tree | bc7111c0c8e6699c97d20f48d36c27e6e84ff1d0 /drivers/gpu | |
| parent | 3e4d5b30d2b262c6db84773cafe9097f7ec61ff5 (diff) | |
| download | linux-ee5c2c7d4bb6998ff11778436acbdc3154ce74ef.tar.xz | |
drm/vkms: Allow to configure CRTC writeback support via configfs
When a CRTC is created, add a `writeback` file to allow to enable or
disable writeback connector support
Tested-by: Mark Yacoub <markyacoub@google.com>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
Co-developed-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Link: https://lore.kernel.org/r/20251016175618.10051-7-jose.exposito89@gmail.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_configfs.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c index 62a82366791d..e9f445043268 100644 --- a/drivers/gpu/drm/vkms/vkms_configfs.c +++ b/drivers/gpu/drm/vkms/vkms_configfs.c @@ -74,6 +74,47 @@ struct vkms_configfs_crtc { #define crtc_item_to_vkms_configfs_crtc(item) \ container_of(to_config_group((item)), struct vkms_configfs_crtc, group) +static ssize_t crtc_writeback_show(struct config_item *item, char *page) +{ + struct vkms_configfs_crtc *crtc; + bool writeback; + + crtc = crtc_item_to_vkms_configfs_crtc(item); + + scoped_guard(mutex, &crtc->dev->lock) + writeback = vkms_config_crtc_get_writeback(crtc->config); + + return sprintf(page, "%d\n", writeback); +} + +static ssize_t crtc_writeback_store(struct config_item *item, const char *page, + size_t count) +{ + struct vkms_configfs_crtc *crtc; + bool writeback; + + crtc = crtc_item_to_vkms_configfs_crtc(item); + + if (kstrtobool(page, &writeback)) + return -EINVAL; + + scoped_guard(mutex, &crtc->dev->lock) { + if (crtc->dev->enabled) + return -EBUSY; + + vkms_config_crtc_set_writeback(crtc->config, writeback); + } + + return (ssize_t)count; +} + +CONFIGFS_ATTR(crtc_, writeback); + +static struct configfs_attribute *crtc_item_attrs[] = { + &crtc_attr_writeback, + NULL, +}; + static void crtc_release(struct config_item *item) { struct vkms_configfs_crtc *crtc; @@ -93,6 +134,7 @@ static struct configfs_item_operations crtc_item_operations = { }; static const struct config_item_type crtc_item_type = { + .ct_attrs = crtc_item_attrs, .ct_item_ops = &crtc_item_operations, .ct_owner = THIS_MODULE, }; |