disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/gpu/drm/xen/xen_drm_front_kms.c
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@@ -8,17 +8,18 @@
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  * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
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  */
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-#include "xen_drm_front_kms.h"
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-
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-#include <drm/drmP.h>
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 #include <drm/drm_atomic.h>
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 #include <drm/drm_atomic_helper.h>
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-#include <drm/drm_crtc_helper.h>
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+#include <drm/drm_drv.h>
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+#include <drm/drm_fourcc.h>
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 #include <drm/drm_gem.h>
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 #include <drm/drm_gem_framebuffer_helper.h>
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+#include <drm/drm_probe_helper.h>
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+#include <drm/drm_vblank.h>
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 #include "xen_drm_front.h"
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 #include "xen_drm_front_conn.h"
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+#include "xen_drm_front_kms.h"
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 /*
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  * Timeout in ms to wait for frame done event from the backend:
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@@ -45,7 +46,7 @@
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 	drm_gem_fb_destroy(fb);
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 }
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-static struct drm_framebuffer_funcs fb_funcs = {
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+static const struct drm_framebuffer_funcs fb_funcs = {
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 	.destroy = fb_destroy,
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 };
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@@ -54,7 +55,7 @@
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 	  const struct drm_mode_fb_cmd2 *mode_cmd)
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 {
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 	struct xen_drm_front_drm_info *drm_info = dev->dev_private;
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-	static struct drm_framebuffer *fb;
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+	struct drm_framebuffer *fb;
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 	struct drm_gem_object *gem_obj;
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 	int ret;
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@@ -62,14 +63,7 @@
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 	if (IS_ERR(fb))
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 		return fb;
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-	gem_obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
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-	if (!gem_obj) {
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-		DRM_ERROR("Failed to lookup GEM object\n");
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-		ret = -ENOENT;
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-		goto fail;
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-	}
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-
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-	drm_gem_object_put_unlocked(gem_obj);
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+	gem_obj = fb->obj[0];
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 	ret = xen_drm_front_fb_attach(drm_info->front_info,
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 				      xen_drm_front_dbuf_to_cookie(gem_obj),
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@@ -226,6 +220,24 @@
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 	return false;
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 }
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+static int display_check(struct drm_simple_display_pipe *pipe,
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+			 struct drm_plane_state *plane_state,
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+			 struct drm_crtc_state *crtc_state)
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+{
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+	/*
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+	 * Xen doesn't initialize vblanking via drm_vblank_init(), so
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+	 * DRM helpers assume that it doesn't handle vblanking and start
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+	 * sending out fake VBLANK events automatically.
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+	 *
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+	 * As xen contains it's own logic for sending out VBLANK events
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+	 * in send_pending_event(), disable no_vblank (i.e., the xen
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+	 * driver has vblanking support).
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+	 */
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+	crtc_state->no_vblank = false;
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+
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+	return 0;
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+}
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+
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 static void display_update(struct drm_simple_display_pipe *pipe,
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 			   struct drm_plane_state *old_plane_state)
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 {
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@@ -269,11 +281,12 @@
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 }
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 static enum drm_mode_status
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-display_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode)
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+display_mode_valid(struct drm_simple_display_pipe *pipe,
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+		   const struct drm_display_mode *mode)
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 {
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 	struct xen_drm_front_drm_pipeline *pipeline =
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-			container_of(crtc, struct xen_drm_front_drm_pipeline,
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-				     pipe.crtc);
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+			container_of(pipe, struct xen_drm_front_drm_pipeline,
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+				     pipe);
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 	if (mode->hdisplay != pipeline->width)
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 		return MODE_ERROR;
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@@ -289,6 +302,7 @@
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 	.enable = display_enable,
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 	.disable = display_disable,
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 	.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
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+	.check = display_check,
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 	.update = display_update,
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 };
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