From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Mon, 16 May 2016 14:47:09 +0200 Subject: [PATCH 09/20] drm/sun4i: defer only if we didn't find our panel In-Reply-To: <1463402840-17062-1-git-send-email-maxime.ripard@free-electrons.com> References: <1463402840-17062-1-git-send-email-maxime.ripard@free-electrons.com> Message-ID: <1463402840-17062-10-git-send-email-maxime.ripard@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Our code currently defers our probe on any error, even if we were not expecting to have one at all. Make sure we return -EPROBE_DEFER only when we were supposed to have a panel, but it's not probed yet. Fixes: 29e57fab97fc ("drm: sun4i: Add RGB output") Signed-off-by: Maxime Ripard --- drivers/gpu/drm/sun4i/sun4i_tcon.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 9f19b0e08560..eed6a9e8d9a6 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -429,7 +429,7 @@ static struct drm_panel *sun4i_tcon_find_panel(struct device_node *node) return ERR_PTR(-EINVAL); } - return of_drm_find_panel(remote); + return of_drm_find_panel(remote) ?: ERR_PTR(-EPROBE_DEFER); } static int sun4i_tcon_bind(struct device *dev, struct device *master, @@ -522,12 +522,13 @@ static int sun4i_tcon_probe(struct platform_device *pdev) * Defer the probe. */ panel = sun4i_tcon_find_panel(node); - if (IS_ERR(panel)) { - /* - * If we don't have a panel endpoint, just go on - */ - if (PTR_ERR(panel) != -ENODEV) - return -EPROBE_DEFER; + + /* + * If we don't have a panel endpoint, just go on + */ + if (PTR_ERR(panel) == -EPROBE_DEFER) { + DRM_DEBUG_DRIVER("Still waiting for our panel. Deferring...\n"); + return -EPROBE_DEFER; } return component_add(&pdev->dev, &sun4i_tcon_ops); -- 2.8.2