linux-kernel - [PATCH 03/10] drm/sun4i: Don't pretend to handle ARGB8888 with the frontend

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Date:   Wed, 21 Mar 2018 16:28:57 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Sean Paul <seanpaul@...omium.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: [PATCH 03/10] drm/sun4i: Don't pretend to handle ARGB8888 with the frontend

It turns out that the frontend is not capable of preserving the alpha
component (that is always set to 0xff), so only support XRGB8888
instead.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
---
 drivers/gpu/drm/sun4i/sun4i_backend.c  | 4 ++++
 drivers/gpu/drm/sun4i/sun4i_frontend.c | 3 +--
 drivers/gpu/drm/sun4i/sun4i_layer.c    | 4 ++--
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
index b98dafda52f8..274a1db6fa8e 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -440,6 +440,10 @@ static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state)
 	if (IS_ERR(backend->frontend))
 		return false;
 
+	/*
+	 * TODO: Don't use the frontend for x2/x4 scaling and allow RGB formats
+	 * with an alpha component then.
+	 */
 	return sun4i_backend_plane_uses_scaler(state);
 }
 
diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.c b/drivers/gpu/drm/sun4i/sun4i_frontend.c
index ddf6cfa6dd23..3ea925584891 100644
--- a/drivers/gpu/drm/sun4i/sun4i_frontend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_frontend.c
@@ -107,7 +107,7 @@ EXPORT_SYMBOL(sun4i_frontend_update_buffer);
 static int sun4i_frontend_drm_format_to_input_fmt(uint32_t fmt, u32 *val)
 {
 	switch (fmt) {
-	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_XRGB8888:
 		*val = 5;
 		return 0;
 
@@ -120,7 +120,6 @@ static int sun4i_frontend_drm_format_to_output_fmt(uint32_t fmt, u32 *val)
 {
 	switch (fmt) {
 	case DRM_FORMAT_XRGB8888:
-	case DRM_FORMAT_ARGB8888:
 		*val = 2;
 		return 0;
 
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
index eb93df445a10..15238211a61a 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
@@ -100,9 +100,9 @@ static void sun4i_backend_layer_atomic_update(struct drm_plane *plane,
 		sun4i_frontend_update_coord(frontend, plane);
 		sun4i_frontend_update_buffer(frontend, plane);
 		sun4i_frontend_update_formats(frontend, plane,
-					      DRM_FORMAT_ARGB8888);
+					      DRM_FORMAT_XRGB8888);
 		sun4i_backend_update_layer_frontend(backend, layer->id, plane,
-						    DRM_FORMAT_ARGB8888);
+						    DRM_FORMAT_XRGB8888);
 		sun4i_frontend_enable(frontend);
 	} else {
 		sun4i_backend_update_layer_formats(backend, layer->id, plane);
-- 
2.16.2