On Thu, Aug 29, 2013 at 10:59:22AM -0300, Fabio Estevam wrote:
> Since commit b5dc0d10 (drm/imx: kill firstopen callback) the following probe
> failure is seen:
>
> [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
> [drm] No driver support for vblank timestamp query.
> [drm] Initialized imx-drm 1.0.0 20120507 on minor 0
> imx-ldb ldb.10: adding encoder failed with -16
> imx-ldb: probe of ldb.10 failed with error -16
> imx-ipuv3 2400000.ipu: IPUv3H probed
> imx-ipuv3 2800000.ipu: IPUv3H probed
> imx-ipuv3-crtc imx-ipuv3-crtc.0: adding crtc failed with -16.
> imx-ipuv3-crtc: probe of imx-ipuv3-crtc.0 failed with error -16
> imx-ipuv3-crtc imx-ipuv3-crtc.1: adding crtc failed with -16.
> imx-ipuv3-crtc: probe of imx-ipuv3-crtc.1 failed with error -16
> imx-ipuv3-crtc imx-ipuv3-crtc.2: adding crtc failed with -16.
> imx-ipuv3-crtc: probe of imx-ipuv3-crtc.2 failed with error -16
> imx-ipuv3-crtc imx-ipuv3-crtc.3: adding crtc failed with -16.
> imx-ipuv3-crtc: probe of imx-ipuv3-crtc.3 failed with error -16
>
> The reason for the probe failure is that now 'imxdrm->references' is
> incremented
> early in imx_drm_driver_load(), so the following checks in imx_drm_add_crtc()
> and imx_drm_add_encoder():
>
> if (imxdrm->references) {
> ret = -EBUSY;
> goto err_busy;
> }
>
> ,will always fail.
>
> Let the drm core handle the references instead of doing this manually in
> imx-drm. In imx-drm-core the open and close callbacks map to drm_open and
> drm_close, which handle the references via open_count.
>
> After this patch, lvds panel is functional on a mx6qsabrelite board.
>
> Signed-off-by: Fabio Estevam <fabio.este...@freescale.com>
> ---
> Changes since v1:
> - Improved commit log by providing an explanation to the probe failure
> - Cc'ed Dave/Daniel
>
> @@ -485,11 +480,6 @@ int imx_drm_add_crtc(struct drm_crtc *crtc,
>
> mutex_lock(&imxdrm->mutex);
>
> - if (imxdrm->references) {
> - ret = -EBUSY;
> - goto err_busy;
> - }
As I told in v1: Simply removing the code is not an option. We agreed
that we use the drm core reference counting, so you must actually test
for it here...
> @@ -564,11 +553,6 @@ int imx_drm_add_encoder(struct drm_encoder *encoder,
>
> mutex_lock(&imxdrm->mutex);
>
> - if (imxdrm->references) {
> - ret = -EBUSY;
> - goto err_busy;
> - }
...here...
> mutex_lock(&imxdrm->mutex);
>
> - if (imxdrm->references) {
> - ret = -EBUSY;
> - goto err_busy;
> - }
...and here.
Sascha
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