drm/udl: Convert to struct drm_simple_display_pipe

Udl has a single display pipeline with a primary plane; perfect for
simple-pipe helpers. Convert it over. The old encoder and CRTC code
becomes unused and obsolete.

Exported formats for the primary plane are RGB565 and XRGB8888, with
the latter being emulated. The 16-bit format is the default and what
is used when communicating with the device.

This patch enables atomic modesetting for udl devices.

v3:
	* remove unused field crtc from struct udl_device
	* set crtc_state->no_vblank at beginning of enable()
v2:
	* move suspend/resume changes into separate patch
	* remove non-atomic code

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191210084905.5570-3-tzimmermann@suse.de

1 files changed, 77 insertions, 93 deletions

diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
index 5bb1522036c7..36b7844e8cf4 100644
--- a/drivers/gpu/drm/udl/udl_modeset.c
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -9,12 +9,16 @@
 
  */
 
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_vblank.h>
 
 #include "udl_drv.h"
 
+#define UDL_COLOR_DEPTH_16BPP	0
+
 /*
  * All DisplayLink bulk operations start with 0xAF, followed by specific code
  * All operations are written to buffers which then later get sent to device
@@ -277,48 +281,44 @@ static void udl_crtc_dpms(struct drm_crtc *crtc, int mode)
 
 }
 
-#if 0
-static int
-udl_pipe_set_base_atomic(struct drm_crtc *crtc, struct drm_framebuffer *fb,
-			   int x, int y, enum mode_set_atomic state)
-{
-	return 0;
-}
+/*
+ * Simple display pipeline
+ */
 
-static int
-udl_pipe_set_base(struct drm_crtc *crtc, int x, int y,
-		    struct drm_framebuffer *old_fb)
+static const uint32_t udl_simple_display_pipe_formats[] = {
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_XRGB8888,
+};
+
+static enum drm_mode_status
+udl_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
+				   const struct drm_display_mode *mode)
 {
-	return 0;
+	return MODE_OK;
 }
-#endif
-
-static int udl_crtc_mode_set(struct drm_crtc *crtc,
-			       struct drm_display_mode *mode,
-			       struct drm_display_mode *adjusted_mode,
-			       int x, int y,
-			       struct drm_framebuffer *old_fb)
 
+static void
+udl_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
+			       struct drm_crtc_state *crtc_state,
+			       struct drm_plane_state *plane_state)
 {
+	struct drm_crtc *crtc = &pipe->crtc;
 	struct drm_device *dev = crtc->dev;
-	struct drm_framebuffer *fb = crtc->primary->fb;
+	struct drm_framebuffer *fb = plane_state->fb;
 	struct udl_device *udl = dev->dev_private;
+	struct drm_display_mode *mode = &crtc_state->mode;
 	char *buf;
 	char *wrptr;
-	int color_depth = 0;
+	int color_depth = UDL_COLOR_DEPTH_16BPP;
 
-	udl->crtc = crtc;
+	crtc_state->no_vblank = true;
 
 	buf = (char *)udl->mode_buf;
 
-	/* for now we just clip 24 -> 16 - if we fix that fix this */
-	/*if  (crtc->fb->bits_per_pixel != 16)
-	  color_depth = 1; */
-
 	/* This first section has to do with setting the base address on the
-	* controller * associated with the display. There are 2 base
-	* pointers, currently, we only * use the 16 bpp segment.
-	*/
+	 * controller associated with the display. There are 2 base
+	 * pointers, currently, we only use the 16 bpp segment.
+	 */
 	wrptr = udl_vidreg_lock(buf);
 	wrptr = udl_set_color_depth(wrptr, color_depth);
 	/* set base for 16bpp segment to 0 */
@@ -326,7 +326,7 @@ static int udl_crtc_mode_set(struct drm_crtc *crtc,
 	/* set base for 8bpp segment to end of fb */
 	wrptr = udl_set_base8bpp(wrptr, 2 * mode->vdisplay * mode->hdisplay);
 
-	wrptr = udl_set_vid_cmds(wrptr, adjusted_mode);
+	wrptr = udl_set_vid_cmds(wrptr, mode);
 	wrptr = udl_set_blank(wrptr, DRM_MODE_DPMS_ON);
 	wrptr = udl_vidreg_unlock(wrptr);
 
@@ -337,92 +337,68 @@ static int udl_crtc_mode_set(struct drm_crtc *crtc,
 	spin_unlock(&udl->active_fb_16_lock);
 	udl->mode_buf_len = wrptr - buf;
 
-	/* damage all of it */
 	udl_handle_damage(fb, 0, 0, fb->width, fb->height);
-	return 0;
-}
 
+	udl_crtc_dpms(&pipe->crtc, DRM_MODE_DPMS_ON);
+}
 
-static void udl_crtc_disable(struct drm_crtc *crtc)
+static void
+udl_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
 {
-	udl_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
+	udl_crtc_dpms(&pipe->crtc, DRM_MODE_DPMS_OFF);
 }
 
-static void udl_crtc_destroy(struct drm_crtc *crtc)
+static int
+udl_simple_display_pipe_check(struct drm_simple_display_pipe *pipe,
+			      struct drm_plane_state *plane_state,
+			      struct drm_crtc_state *crtc_state)
 {
-	drm_crtc_cleanup(crtc);
-	kfree(crtc);
+	return 0;
 }
 
-static int udl_crtc_page_flip(struct drm_crtc *crtc,
-			      struct drm_framebuffer *fb,
-			      struct drm_pending_vblank_event *event,
-			      uint32_t page_flip_flags,
-			      struct drm_modeset_acquire_ctx *ctx)
+static void
+udl_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
+			       struct drm_plane_state *old_plane_state)
 {
-	struct drm_device *dev = crtc->dev;
+	struct drm_device *dev = pipe->crtc.dev;
 	struct udl_device *udl = dev->dev_private;
+	struct drm_framebuffer *fb = pipe->plane.state->fb;
 
 	spin_lock(&udl->active_fb_16_lock);
 	udl->active_fb_16 = fb;
 	spin_unlock(&udl->active_fb_16_lock);
 
-	udl_handle_damage(fb, 0, 0, fb->width, fb->height);
-
-	spin_lock_irq(&dev->event_lock);
-	if (event)
-		drm_crtc_send_vblank_event(crtc, event);
-	spin_unlock_irq(&dev->event_lock);
-	crtc->primary->fb = fb;
-
-	return 0;
-}
-
-static void udl_crtc_prepare(struct drm_crtc *crtc)
-{
-}
+	if (!fb)
+		return;
 
-static void udl_crtc_commit(struct drm_crtc *crtc)
-{
-	udl_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
+	udl_handle_damage(fb, 0, 0, fb->width, fb->height);
 }
 
-static const struct drm_crtc_helper_funcs udl_helper_funcs = {
-	.dpms = udl_crtc_dpms,
-	.mode_set = udl_crtc_mode_set,
-	.prepare = udl_crtc_prepare,
-	.commit = udl_crtc_commit,
-	.disable = udl_crtc_disable,
-};
-
-static const struct drm_crtc_funcs udl_crtc_funcs = {
-	.set_config = drm_crtc_helper_set_config,
-	.destroy = udl_crtc_destroy,
-	.page_flip = udl_crtc_page_flip,
+static const
+struct drm_simple_display_pipe_funcs udl_simple_display_pipe_funcs = {
+	.mode_valid = udl_simple_display_pipe_mode_valid,
+	.enable = udl_simple_display_pipe_enable,
+	.disable = udl_simple_display_pipe_disable,
+	.check = udl_simple_display_pipe_check,
+	.update = udl_simple_display_pipe_update,
+	.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
 };
 
-static int udl_crtc_init(struct drm_device *dev)
-{
-	struct drm_crtc *crtc;
-
-	crtc = kzalloc(sizeof(struct drm_crtc) + sizeof(struct drm_connector *), GFP_KERNEL);
-	if (crtc == NULL)
-		return -ENOMEM;
-
-	drm_crtc_init(dev, crtc, &udl_crtc_funcs);
-	drm_crtc_helper_add(crtc, &udl_helper_funcs);
-
-	return 0;
-}
+/*
+ * Modesetting
+ */
 
 static const struct drm_mode_config_funcs udl_mode_funcs = {
 	.fb_create = udl_fb_user_fb_create,
+	.atomic_check  = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
 };
 
 int udl_modeset_init(struct drm_device *dev)
 {
+	size_t format_count = ARRAY_SIZE(udl_simple_display_pipe_formats);
+	struct udl_device *udl = dev->dev_private;
 	struct drm_connector *connector;
-	struct drm_encoder *encoder;
 	int ret;
 
 	drm_mode_config_init(dev);
@@ -444,10 +420,16 @@ int udl_modeset_init(struct drm_device *dev)
 		goto err_drm_mode_config_cleanup;
 	}
 
-	udl_crtc_init(dev);
+	format_count = ARRAY_SIZE(udl_simple_display_pipe_formats);
+
+	ret = drm_simple_display_pipe_init(dev, &udl->display_pipe,
+					   &udl_simple_display_pipe_funcs,
+					   udl_simple_display_pipe_formats,
+					   format_count, NULL, connector);
+	if (ret)
+		goto err_drm_mode_config_cleanup;
 
-	encoder = udl_encoder_init(dev);
-	drm_connector_attach_encoder(connector, encoder);
+	drm_mode_config_reset(dev);
 
 	return 0;
 
@@ -459,12 +441,14 @@ err_drm_mode_config_cleanup:
 void udl_modeset_restore(struct drm_device *dev)
 {
 	struct udl_device *udl = dev->dev_private;
-	struct drm_framebuffer *fb;
+	struct drm_crtc *crtc = &udl->display_pipe.crtc;
+	struct drm_plane *primary = &udl->display_pipe.plane;
+	struct drm_framebuffer *fb = primary->fb;
 
-	if (!udl->crtc || !udl->crtc->primary->fb)
+	if (!fb)
 		return;
-	udl_crtc_commit(udl->crtc);
-	fb = udl->crtc->primary->fb;
+
+	udl_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
 	udl_handle_damage(fb, 0, 0, fb->width, fb->height);
 }