Unfortunately we used the enabled flag in struct drm_crtc instead of the
enabled flag in struct atmel_hlcdc_crtc. This obviously leads to
discrepancies on crtc enable state.

This patch fixes the issue by using the struct atmel_hlcdc_crtc enabled
flag in PM support.
Signed-off-by: NSylvain Rochet <sylvain.rochet@finsecur.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Remove this configuration bit in crtc driver as the rising edge clock is widely
used.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

Some LCD panels have back-powering issue when un-powered, allows users
to use an alternate pinctrl "sleep" in order to clamp outputs to a
wanted state at suspend.
Signed-off-by: NSylvain Rochet <sylvain.rochet@finsecur.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The HLCDC IP provides a way to discard a specific area on the primary
plane (in case at least one of the overlay is activated and alpha
blending is disabled).
Doing this will reduce the amount of data to transfer from the main
memory to the Display Controller, and thus alleviate the load on the
memory bus (since this link is quite limited on such hardware,
this kind of optimization is really important).
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

Convert the HLCDC driver to atomic mode-setting.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: NSylvain Rochet <sylvain.rochet@finsecur.com>
Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

The Atmel HLCDC (HLCD Controller) IP available on some Atmel SoCs (i.e.
at91sam9n12, at91sam9x5 family or sama5d3 family) provides a display
controller device.

This display controller supports at least one primary plane and might
provide several overlays and an hardware cursor depending on the IP
version.

At the moment, this driver only implements an RGB connector to interface
with LCD panels, but support for other kind of external devices might be
added later.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: NRob Clark <robdclark@gmail.com>
Tested-by: NAnthony Harivel <anthony.harivel@emtrion.de>
Tested-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>