Hi Paul,

Am 24.01.2021 um 10:43 schrieb Paul Cercueil [off-list ref]:

Hi Nikolaus,

Le dim. 24 janv. 2021 à 10:30, H. Nikolaus Schaller [off-list ref] a écrit :

quoted

Hi Paul,
we observed the same issue on the jz4730 (which is almost identical
to the jz4740 wrt. LCDC) and our solution [1] was simpler.
It leaves the hwdesc f0 and f1 as they are and just takes f1 for really
programming the first DMA descriptor if there is no OSD.

Disagreed. With your solution, it ends up using priv->f1 plane with hwdesc_f0. That's very confusing.

It is a tradeoff between code simplicity and confusion. Indeed difficult to decide. Fortunately I don't have to :)

quoted

We have tested on jz4730 and jz4780.

Could I get a tested-by then? :)

I'll test with our tree and test both SoC in the next days and give feedback.

BR and thanks,
Nikolaus

Cheers,
-Paul

quoted

Maybe you want to consider that. Then I can officially post it.
[1] https://github.com/goldelico/letux-kernel/commit/3be1de5fdabf2cc1c17f198ded3328cc6e4b9844

quoted

Am 24.01.2021 um 09:55 schrieb Paul Cercueil [off-list ref]:
Even though the JZ4740 did not have the OSD mode, it had (according to
the documentation) two DMA channels, but there is absolutely no
information about how to select the second DMA channel.
Make the ingenic-drm driver work in non-OSD mode by using the
foreground0 plane (which is bound to the DMA0 channel) as the primary
plane, instead of the foreground1 plane, which is the primary plane
when in OSD mode.
Fixes: 3c9bea4ef32b ("drm/ingenic: Add support for OSD mode")
Cc: <redacted> # v5.8+
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Acked-by: Daniel Vetter <redacted>
---
drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index b23011c1c5d9..59ce43862e16 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c

@@ -554,7 +554,7 @@ static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,

		height = state->src_h >> 16;
		cpp = state->fb->format->cpp[0];
-		if (priv->soc_info->has_osd && plane->type == DRM_PLANE_TYPE_OVERLAY)
+		if (!priv->soc_info->has_osd || plane->type == DRM_PLANE_TYPE_OVERLAY)
			hwdesc = &priv->dma_hwdescs->hwdesc_f0;
		else
			hwdesc = &priv->dma_hwdescs->hwdesc_f1;

we just replace this with
               if (priv->soc_info->has_osd && plane->type != DRM_PLANE_TYPE_OVERLAY)
                       hwdesc = &priv->dma_hwdescs->hwdesc_f1;
               else
                       hwdesc = &priv->dma_hwdescs->hwdesc_f0;
and the remainder can stay as is.

quoted

@@ -826,6 +826,7 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)

	const struct jz_soc_info *soc_info;
	struct ingenic_drm *priv;
	struct clk *parent_clk;
+	struct drm_plane *primary;
	struct drm_bridge *bridge;
	struct drm_panel *panel;
	struct drm_encoder *encoder;

@@ -940,9 +941,11 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)

	if (soc_info->has_osd)
		priv->ipu_plane = drm_plane_from_index(drm, 0);
-	drm_plane_helper_add(&priv->f1, &ingenic_drm_plane_helper_funcs);
+	primary = priv->soc_info->has_osd ? &priv->f1 : &priv->f0;
-	ret = drm_universal_plane_init(drm, &priv->f1, 1,
+	drm_plane_helper_add(primary, &ingenic_drm_plane_helper_funcs);
+
+	ret = drm_universal_plane_init(drm, primary, 1,
				       &ingenic_drm_primary_plane_funcs,
				       priv->soc_info->formats_f1,
				       priv->soc_info->num_formats_f1,

@@ -954,7 +957,7 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)

	drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
-	ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->f1,
+	ret = drm_crtc_init_with_planes(drm, &priv->crtc, primary,
					NULL, &ingenic_drm_crtc_funcs, NULL);
	if (ret) {
		dev_err(dev, "Failed to init CRTC: %i\n", ret);
--
2.29.2

BR and thanks,
Nikolaus