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drm: rcar-du: Use dev_err_probe() to record cause of KMS init errors

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The (large) rcar_du_modeset_init() function can fail for many reasons,
two of two involving probe deferral. Use dev_err_probe() in those code
paths to record the cause of the probe deferral, in order to help
debugging probe issues.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2023-05-30 12:19:58 +03:00
parent c58dcab081
commit f3651bc0b7
2 changed files with 8 additions and 2 deletions
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4
drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
View File

@ -696,6 +696,10 @@ static int rcar_du_probe(struct platform_device *pdev)
/* DRM/KMS objects */
ret = rcar_du_modeset_init(rcdu);
if (ret < 0) {
/*
* Don't use dev_err_probe(), as it would overwrite the probe
* deferral reason recorded in rcar_du_modeset_init().
*/
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev,
"failed to initialize DRM/KMS (%d)\n", ret);

6
drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
View File

@ -935,7 +935,8 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
/* Initialize the Color Management Modules. */
ret = rcar_du_cmm_init(rcdu);
if (ret)
return ret;
return dev_err_probe(rcdu->dev, ret,
"failed to initialize CMM\n");
/* Create the CRTCs. */
for (swindex = 0, hwindex = 0; swindex < rcdu->num_crtcs; ++hwindex) {
@ -955,7 +956,8 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
/* Initialize the encoders. */
ret = rcar_du_encoders_init(rcdu);
if (ret < 0)
return ret;
return dev_err_probe(rcdu->dev, ret,
"failed to initialize encoders\n");
if (ret == 0) {
dev_err(rcdu->dev, "error: no encoder could be initialized\n");