Re: [PATCH 1/2] drm/probe-helper: Add helper for drm_helper_probe_single_connector_modes()

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Hi

Am 26.04.22 um 20:46 schrieb Douglas Anderson:
The drm_helper_probe_single_connector_modes() is a bit long. Let's
break a chunk off to update and validate modes. This helps avoid one
goto and also will allow us to more easily call the helper a second
time in a future patch without adding looping or another goto.

This change is intended to be a no-op change--just code movement.

Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>


---

  drivers/gpu/drm/drm_probe_helper.c | 105 ++++++++++++++++-------------
  1 file changed, 59 insertions(+), 46 deletions(-)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 682359512996..819225629010 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -354,6 +354,61 @@ drm_helper_probe_detect(struct drm_connector *connector,
  }
  EXPORT_SYMBOL(drm_helper_probe_detect);
+static bool _drm_helper_update_and_validate(struct drm_connector *connector,

AFAIK convention is to use two underscores for internal names.

+					    uint32_t maxX, uint32_t maxY,
+					    struct drm_modeset_acquire_ctx *ctx)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_display_mode *mode;
+	int mode_flags = 0;
+	int ret;
+
+	drm_connector_list_update(connector);
+
+	if (connector->interlace_allowed)
+		mode_flags |= DRM_MODE_FLAG_INTERLACE;
+	if (connector->doublescan_allowed)
+		mode_flags |= DRM_MODE_FLAG_DBLSCAN;
+	if (connector->stereo_allowed)
+		mode_flags |= DRM_MODE_FLAG_3D_MASK;
+
+	list_for_each_entry(mode, &connector->modes, head) {
+		if (mode->status != MODE_OK)
+			continue;
+
+		mode->status = drm_mode_validate_driver(dev, mode);
+		if (mode->status != MODE_OK)
+			continue;
+
+		mode->status = drm_mode_validate_size(mode, maxX, maxY);
+		if (mode->status != MODE_OK)
+			continue;
+
+		mode->status = drm_mode_validate_flag(mode, mode_flags);
+		if (mode->status != MODE_OK)
+			continue;
+
+		ret = drm_mode_validate_pipeline(mode, connector, ctx,
+						 &mode->status);
+		if (ret) {
+			drm_dbg_kms(dev,
+				    "drm_mode_validate_pipeline failed: %d\n",
+				    ret);
+
+			if (drm_WARN_ON_ONCE(dev, ret != -EDEADLK))
+				mode->status = MODE_ERROR;
+			else
+				return true;

Returning true is non-intuitive. It looks as if we report success when it actually signals a retry.

I suggest to return 'ret' here and let the caller decide. On success at the end of the function, it would return 0 as usual.

Best regards
Thomas

+		}
+
+		if (mode->status != MODE_OK)
+			continue;
+		mode->status = drm_mode_validate_ycbcr420(mode, connector);
+	}
+
+	return false;
+}
+
  /**
   * drm_helper_probe_single_connector_modes - get complete set of display modes
   * @connector: connector to probe
@@ -421,7 +476,6 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  	const struct drm_connector_helper_funcs *connector_funcs =
  		connector->helper_private;
  	int count = 0, ret;
-	int mode_flags = 0;
  	bool verbose_prune = true;
  	enum drm_connector_status old_status;
  	struct drm_modeset_acquire_ctx ctx;
@@ -519,52 +573,11 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
  			   connector->status == connector_status_unknown))
  		count = drm_add_modes_noedid(connector, 1024, 768);
  	count += drm_helper_probe_add_cmdline_mode(connector);
-	if (count == 0)
-		goto prune;
-
-	drm_connector_list_update(connector);
-
-	if (connector->interlace_allowed)
-		mode_flags |= DRM_MODE_FLAG_INTERLACE;
-	if (connector->doublescan_allowed)
-		mode_flags |= DRM_MODE_FLAG_DBLSCAN;
-	if (connector->stereo_allowed)
-		mode_flags |= DRM_MODE_FLAG_3D_MASK;
-
-	list_for_each_entry(mode, &connector->modes, head) {
-		if (mode->status != MODE_OK)
-			continue;
-
-		mode->status = drm_mode_validate_driver(dev, mode);
-		if (mode->status != MODE_OK)
-			continue;
-
-		mode->status = drm_mode_validate_size(mode, maxX, maxY);
-		if (mode->status != MODE_OK)
-			continue;
-
-		mode->status = drm_mode_validate_flag(mode, mode_flags);
-		if (mode->status != MODE_OK)
-			continue;
-
-		ret = drm_mode_validate_pipeline(mode, connector, &ctx,
-						 &mode->status);
-		if (ret) {
-			drm_dbg_kms(dev,
-				    "drm_mode_validate_pipeline failed: %d\n",
-				    ret);
-
-			if (drm_WARN_ON_ONCE(dev, ret != -EDEADLK)) {
-				mode->status = MODE_ERROR;
-			} else {
-				drm_modeset_backoff(&ctx);
-				goto retry;
-			}
+	if (count != 0) {
+		if (_drm_helper_update_and_validate(connector, maxX, maxY, &ctx)) {
+			drm_modeset_backoff(&ctx);
+			goto retry;
  		}
-
-		if (mode->status != MODE_OK)
-			continue;
-		mode->status = drm_mode_validate_ycbcr420(mode, connector);
  	}
prune:

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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