[PATCH] drm/panel: simple: Skip error message on deferred probe

[PATCH] drm/panel: simple: Skip error message on deferred probe

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@nxp.com>

When enable_gpio is provided via an I2C or SPI expander, it may not be
available when panel-simple probes leading to the following error:

panel-simple panel: failed to request GPIO: -517

As this error message is not very useful to the end user, skip printing
it in the case of deferred probe.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 474fa75..9469c4d 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -315,7 +315,8 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
 						     GPIOD_OUT_LOW);
 	if (IS_ERR(panel->enable_gpio)) {
 		err = PTR_ERR(panel->enable_gpio);
-		dev_err(dev, "failed to request GPIO: %d\n", err);
+		if (err != -EPROBE_DEFER)
+			dev_err(dev, "failed to request GPIO: %d\n", err);
 		return err;
 	}
 
-- 
2.7.4

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Re: [PATCH] drm/panel: simple: Skip error message on deferred probe

[Thierry Reding]

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On Fri, Jun 30, 2017 at 06:14:46PM -0300, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@nxp.com>
> 
> When enable_gpio is provided via an I2C or SPI expander, it may not be
> available when panel-simple probes leading to the following error:
> 
> panel-simple panel: failed to request GPIO: -517
> 
> As this error message is not very useful to the end user, skip printing
> it in the case of deferred probe.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
> ---
>  drivers/gpu/drm/panel/panel-simple.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied to drm-misc-next, thanks.

Thierry

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