drm: atmel-hlcdc: add support for 8-bit color lookup table mode

All layers of all supported chips support this, the only variable is the
base address of the lookup table in the register map.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1498107791-17450-3-git-send-email-peda@axentia.se

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
index 1124200bb280..b5bd9b005225 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -83,6 +83,7 @@ drm_plane_state_to_atmel_hlcdc_plane_state(struct drm_plane_state *s)
 #define SUBPIXEL_MASK			0xffff
 
 static uint32_t rgb_formats[] = {
+	DRM_FORMAT_C8,
 	DRM_FORMAT_XRGB4444,
 	DRM_FORMAT_ARGB4444,
 	DRM_FORMAT_RGBA4444,
@@ -100,6 +101,7 @@ struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats = {
 };
 
 static uint32_t rgb_and_yuv_formats[] = {
+	DRM_FORMAT_C8,
 	DRM_FORMAT_XRGB4444,
 	DRM_FORMAT_ARGB4444,
 	DRM_FORMAT_RGBA4444,
@@ -128,6 +130,9 @@ struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_and_yuv_formats = {
 static int atmel_hlcdc_format_to_plane_mode(u32 format, u32 *mode)
 {
 	switch (format) {
+	case DRM_FORMAT_C8:
+		*mode = ATMEL_HLCDC_C8_MODE;
+		break;
 	case DRM_FORMAT_XRGB4444:
 		*mode = ATMEL_HLCDC_XRGB4444_MODE;
 		break;
@@ -424,6 +429,29 @@ static void atmel_hlcdc_plane_update_format(struct atmel_hlcdc_plane *plane,
 				    ATMEL_HLCDC_LAYER_FORMAT_CFG, cfg);
 }
 
+static void atmel_hlcdc_plane_update_clut(struct atmel_hlcdc_plane *plane)
+{
+	struct drm_crtc *crtc = plane->base.crtc;
+	struct drm_color_lut *lut;
+	int idx;
+
+	if (!crtc || !crtc->state)
+		return;
+
+	if (!crtc->state->color_mgmt_changed || !crtc->state->gamma_lut)
+		return;
+
+	lut = (struct drm_color_lut *)crtc->state->gamma_lut->data;
+
+	for (idx = 0; idx < ATMEL_HLCDC_CLUT_SIZE; idx++, lut++) {
+		u32 val = ((lut->red << 8) & 0xff0000) |
+			(lut->green & 0xff00) |
+			(lut->blue >> 8);
+
+		atmel_hlcdc_layer_write_clut(&plane->layer, idx, val);
+	}
+}
+
 static void atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
 					struct atmel_hlcdc_plane_state *state)
 {
@@ -768,6 +796,7 @@ static void atmel_hlcdc_plane_atomic_update(struct drm_plane *p,
 	atmel_hlcdc_plane_update_pos_and_size(plane, state);
 	atmel_hlcdc_plane_update_general_settings(plane, state);
 	atmel_hlcdc_plane_update_format(plane, state);
+	atmel_hlcdc_plane_update_clut(plane);
 	atmel_hlcdc_plane_update_buffers(plane, state);
 	atmel_hlcdc_plane_update_disc_area(plane, state);