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authorThierry Reding <treding@nvidia.com>2021-03-19 10:06:37 +0300
committerThierry Reding <treding@nvidia.com>2021-03-30 20:40:43 +0300
commita31500fe7055451ed9043c8fff938dfa6f70ee37 (patch)
tree5d9292b52fc2ed77ef6f6dd91b8b40c5ab0bf96a /drivers/gpu
parenta24f98176d1efae2c37d3438c57a624d530d9c33 (diff)
downloadlinux-a31500fe7055451ed9043c8fff938dfa6f70ee37.tar.xz
drm/tegra: dc: Restore coupling of display controllers
Coupling of display controllers used to rely on runtime PM to take the companion controller out of reset. Commit fd67e9c6ed5a ("drm/tegra: Do not implement runtime PM") accidentally broke this when runtime PM was removed. Restore this functionality by reusing the hierarchical host1x client suspend/resume infrastructure that's similar to runtime PM and which perfectly fits this use-case. Fixes: fd67e9c6ed5a ("drm/tegra: Do not implement runtime PM") Reported-by: Dmitry Osipenko <digetx@gmail.com> Reported-by: Paul Fertser <fercerpav@gmail.com> Tested-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/tegra/dc.c20
1 files changed, 8 insertions, 12 deletions
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 24362533e14c..134986dc2783 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -2501,22 +2501,18 @@ static int tegra_dc_couple(struct tegra_dc *dc)
* POWER_CONTROL registers during CRTC enabling.
*/
if (dc->soc->coupled_pm && dc->pipe == 1) {
- u32 flags = DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_CONSUMER;
- struct device_link *link;
- struct device *partner;
+ struct device *companion;
+ struct tegra_dc *parent;
- partner = driver_find_device(dc->dev->driver, NULL, NULL,
- tegra_dc_match_by_pipe);
- if (!partner)
+ companion = driver_find_device(dc->dev->driver, NULL, (const void *)0,
+ tegra_dc_match_by_pipe);
+ if (!companion)
return -EPROBE_DEFER;
- link = device_link_add(dc->dev, partner, flags);
- if (!link) {
- dev_err(dc->dev, "failed to link controllers\n");
- return -EINVAL;
- }
+ parent = dev_get_drvdata(companion);
+ dc->client.parent = &parent->client;
- dev_dbg(dc->dev, "coupled to %s\n", dev_name(partner));
+ dev_dbg(dc->dev, "coupled to %s\n", dev_name(companion));
}
return 0;