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@xxxxxxxxxxx>
---
Changes in v3:
- Rework error handling in a few drivers as suggested by Thierry
- Return -ENODEV when CONFIG_OF or CONFIG_DRM_PANEL are not enabled
Changes in v2:
- New commit
---
drivers/gpu/drm/bridge/cdns-dsi.c | 2 +-
drivers/gpu/drm/bridge/lvds-encoder.c | 4 ++--
drivers/gpu/drm/drm_of.c | 4 +++-
drivers/gpu/drm/drm_panel.c | 6 ++++--
drivers/gpu/drm/exynos/exynos_dp.c | 6 ++++--
drivers/gpu/drm/exynos/exynos_drm_dpi.c | 4 ++--
drivers/gpu/drm/exynos/exynos_drm_dsi.c | 3 +++
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 5 +++--
drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c | 4 ++--
drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c | 5 ++++-
drivers/gpu/drm/msm/dsi/dsi_host.c | 2 +-
drivers/gpu/drm/rcar-du/rcar_lvds.c | 4 ++--
drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 2 +-
drivers/gpu/drm/sti/sti_dvo.c | 4 +++-
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 4 ++--
drivers/gpu/drm/tegra/dsi.c | 3 +++
drivers/gpu/drm/tegra/output.c | 4 ++--
include/drm/drm_panel.h | 2 +-
18 files changed, 43 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
index c255fc3e1be5..2c5991cf5397 100644
--- a/drivers/gpu/drm/bridge/cdns-dsi.c
+++ b/drivers/gpu/drm/bridge/cdns-dsi.c
@@ -1152,7 +1152,7 @@ static int cdns_dsi_attach(struct mipi_dsi_host *host,
np = of_node_get(dev->dev.of_node);
panel = of_drm_find_panel(np);
- if (panel) {
+ if (!IS_ERR(panel)) {
bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DSI);
} else {
bridge = of_drm_find_bridge(dev->dev.of_node);
diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c b/drivers/gpu/drm/bridge/lvds-encoder.c
index 75b0d3f6e4de..f56c92f7af7c 100644
--- a/drivers/gpu/drm/bridge/lvds-encoder.c
+++ b/drivers/gpu/drm/bridge/lvds-encoder.c
@@ -68,9 +68,9 @@ static int lvds_encoder_probe(struct platform_device *pdev)
panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
- if (!panel) {
+ if (IS_ERR(panel)) {
dev_dbg(&pdev->dev, "panel not found, deferring probe\n");
- return -EPROBE_DEFER;
+ return PTR_ERR(panel);
}
lvds_encoder->panel_bridge =
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 1fe122461298..81d3f76c43f3 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -240,8 +240,10 @@ int drm_of_find_panel_or_bridge(const struct device_node *np,
if (panel) {
*panel = of_drm_find_panel(remote);
- if (*panel)
+ if (!IS_ERR(*panel))
ret = 0;
+ else
+ *panel = NULL;
}
/* No panel found yet, check for a bridge next. */
diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index 308d442a531b..49642d79df8f 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -135,7 +135,9 @@ EXPORT_SYMBOL(drm_panel_detach);
* tree node. If a matching panel is found, return a pointer to it.
*
* Return: A pointer to the panel registered for the specified device tree
- * node or NULL if no panel matching the device tree node can be found.
+ * node or an ERR_PTR() if no panel matching the device tree node can be found.
+ * The only error that can be reported is -EPROBE_DEFER, meaning that the panel
+ * device has not been probed yet, and the caller should retry later.
*/
struct drm_panel *of_drm_find_panel(const struct device_node *np)
{
@@ -151,7 +153,7 @@ struct drm_panel *of_drm_find_panel(const struct device_node *np)
}
mutex_unlock(&panel_lock);
- return NULL;
+ return ERR_PTR(-EPROBE_DEFER);
}
EXPORT_SYMBOL(of_drm_find_panel);
#endif
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 86330f396784..af7ab1ceb50f 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -232,9 +232,11 @@ static int exynos_dp_probe(struct platform_device *pdev)
np = of_parse_phandle(dev->of_node, "panel", 0);
if (np) {
dp->plat_data.panel = of_drm_find_panel(np);
+
of_node_put(np);
- if (!dp->plat_data.panel)
- return -EPROBE_DEFER;
+ if (IS_ERR(dp->plat_data.panel))
+ return PTR_ERR(dp->plat_data.panel);
+
goto out;
}
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
index 66945e0dc57f..5887e8522b70 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
@@ -240,8 +240,8 @@ struct drm_encoder *exynos_dpi_probe(struct device *dev)
if (ctx->panel_node) {
ctx->panel = of_drm_find_panel(ctx->panel_node);
- if (!ctx->panel)
- return ERR_PTR(-EPROBE_DEFER);
+ if (IS_ERR(ctx->panel))
+ return ERR_CAST(ctx->panel);
}
return &ctx->encoder;
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 7904ffa9abfb..27d40da77181 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1539,6 +1539,9 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
dsi->format = device->format;
dsi->mode_flags = device->mode_flags;
dsi->panel = of_drm_find_panel(device->dev.of_node);
+ if (IS_ERR(dsi->panel))
+ dsi->panel = NULL;
+
if (dsi->panel) {
drm_panel_attach(dsi->panel, &dsi->connector);
dsi->connector.status = connector_status_connected;
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index c54806d08dd7..681e2a07d03b 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -148,8 +148,9 @@ int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
if (panel_node) {
fsl_dev->connector.panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
- if (!fsl_dev->connector.panel)
- return -EPROBE_DEFER;
+ if (IS_ERR(fsl_dev->connector.panel))
+ return PTR_ERR(fsl_dev->connector.panel);
+
return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
}
diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
index 4a645926edb7..2bfb39082f54 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
@@ -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);
}
diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c
index e3b1c86b7aae..32fba5664b0e 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c
@@ -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 :
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 7a03a9489708..fffc80b73966 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1881,7 +1881,7 @@ 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;
}
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 3d2d3bbd1342..ce7fb00909c4 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -431,8 +431,8 @@ static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
ret = -EPROBE_DEFER;
} else {
lvds->panel = of_drm_find_panel(remote);
- if (!lvds->panel)
- ret = -EPROBE_DEFER;
+ if (IS_ERR(lvds->panel))
+ ret = PTR_ERR(lvds->panel);
}
done:
diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index d53d5a09547f..01642aaf6127 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -595,7 +595,7 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
dsi->format = device->format;
dsi->mode_flags = device->mode_flags;
dsi->panel = of_drm_find_panel(device->dev.of_node);
- if (dsi->panel)
+ if (!IS_ERR(dsi->panel))
return drm_panel_attach(dsi->panel, &dsi->connector);
return -EINVAL;
diff --git a/drivers/gpu/drm/sti/sti_dvo.c b/drivers/gpu/drm/sti/sti_dvo.c
index a5979cd25cc7..030da55a8d30 100644
--- a/drivers/gpu/drm/sti/sti_dvo.c
+++ b/drivers/gpu/drm/sti/sti_dvo.c
@@ -387,7 +387,9 @@ sti_dvo_connector_detect(struct drm_connector *connector, bool force)
if (!dvo->panel) {
dvo->panel = of_drm_find_panel(dvo->panel_node);
- if (dvo->panel)
+ if (IS_ERR(dvo->panel))
+ dvo->panel = NULL;
+ else
drm_panel_attach(dvo->panel, connector);
}
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index bfbf761f0c1d..ce388d7cebaa 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -812,8 +812,8 @@ static int sun6i_dsi_attach(struct mipi_dsi_host *host,
dsi->device = device;
dsi->panel = of_drm_find_panel(device->dev.of_node);
- if (!dsi->panel)
- return -EINVAL;
+ if (IS_ERR(dsi->panel))
+ return PTR_ERR(dsi->panel);
dev_info(host->dev, "Attached device %s\n", device->name);
diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index 87c5d89bc9ba..ad88ec230329 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -1411,6 +1411,9 @@ static int tegra_dsi_host_attach(struct mipi_dsi_host *host,
struct tegra_output *output = &dsi->output;
output->panel = of_drm_find_panel(device->dev.of_node);
+ if (IS_ERR(output->panel))
+ output->panel = NULL;
+
if (output->panel && output->connector.dev) {
drm_panel_attach(output->panel, &output->connector);
drm_helper_hpd_irq_event(output->connector.dev);
diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c
index 676fd394836f..c8e3cd633b5a 100644
--- a/drivers/gpu/drm/tegra/output.c
+++ b/drivers/gpu/drm/tegra/output.c
@@ -111,8 +111,8 @@ int tegra_output_probe(struct tegra_output *output)
if (panel) {
output->panel = of_drm_find_panel(panel);
of_node_put(panel);
- if (!output->panel)
- return -EPROBE_DEFER;
+ if (IS_ERR(output->panel))
+ return PTR_ERR(output->panel);
}
output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 14ac240a1f64..777814755fa6 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -199,7 +199,7 @@ struct drm_panel *of_drm_find_panel(const struct device_node *np);
#else
static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
{
- return NULL;
+ return ERR_PTR(-ENODEV);
}
#endif
--
2.14.1
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