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drm/panel: Make of_drm_find_panel() return an ERR_PTR() instead of NULL

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Right now, the DRM panel logic returns NULL when a panel pointing to
the passed OF node is not present in the list of registered panels.

Most drivers interpret this NULL value as -EPROBE_DEFER, but we are
about to modify the semantic of of_drm_find_panel() and let the
framework return -ENODEV when the device node we're pointing to has
a status property that is not equal to "okay" or "ok".

Let's first patch the of_drm_find_panel() implementation to return
ERR_PTR(-EPROBE_DEFER) instead of NULL and patch all callers to replace
the '!panel' check by an 'IS_ERR(panel)' one.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180509130042.9435-2-boris.brezillon@bootlin.com
This commit is contained in:
Boris Brezillon
2018-05-09 15:00:39 +02:00
committed by Thierry Reding
parent 0ca0c827ef
commit 5fa8e4a221
18 changed files with 43 additions and 25 deletions
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4
drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
View File

@@ -341,7 +341,7 @@ static void mdp4_lcdc_encoder_disable(struct drm_encoder *encoder)
mdp4_write(mdp4_kms, REG_MDP4_LCDC_ENABLE, 0);
panel = of_drm_find_panel(mdp4_lcdc_encoder->panel_node);
if (panel) {
if (!IS_ERR(panel)) {
drm_panel_disable(panel);
drm_panel_unprepare(panel);
}
@@ -410,7 +410,7 @@ static void mdp4_lcdc_encoder_enable(struct drm_encoder *encoder)
dev_err(dev->dev, "failed to enable lcdc_clk: %d\n", ret);
panel = of_drm_find_panel(mdp4_lcdc_encoder->panel_node);
if (panel) {
if (!IS_ERR(panel)) {
drm_panel_prepare(panel);
drm_panel_enable(panel);
}

5
drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c
View File

@@ -34,9 +34,12 @@ static enum drm_connector_status mdp4_lvds_connector_detect(
struct mdp4_lvds_connector *mdp4_lvds_connector =
to_mdp4_lvds_connector(connector);
if (!mdp4_lvds_connector->panel)
if (!mdp4_lvds_connector->panel) {
mdp4_lvds_connector->panel =
of_drm_find_panel(mdp4_lvds_connector->panel_node);
if (IS_ERR(mdp4_lvds_connector->panel))
mdp4_lvds_connector->panel = NULL;
}
return mdp4_lvds_connector->panel ?
connector_status_connected :

2
drivers/gpu/drm/msm/dsi/dsi_host.c
View File

@@ -1898,7 +1898,7 @@ int msm_dsi_host_register(struct mipi_dsi_host *host, bool check_defer)
* output
*/
if (check_defer && msm_host->device_node) {
if (!of_drm_find_panel(msm_host->device_node))
if (IS_ERR(of_drm_find_panel(msm_host->device_node)))
if (!of_drm_find_bridge(msm_host->device_node))
return -EPROBE_DEFER;
}