Re: [PATCH v2 03/12] drm/i915/fbdev: Move intel_fb_initial_config() to fbdev helper

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Hi

Am 07.04.19 um 18:52 schrieb Noralf Trønnes:
> It is generic code and having it in the helper will let other drivers
> benefit from it.
> 
> One change was necessary assuming this to be true:
> INTEL_INFO(dev_priv)->num_pipes == dev->mode_config.num_crtc
> 
> Suggested-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
> Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
>  drivers/gpu/drm/drm_fb_helper.c    | 194 ++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_fbdev.c | 218 -----------------------------
>  include/drm/drm_fb_helper.h        |  23 ---
>  3 files changed, 190 insertions(+), 245 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index a6be09ae899b..eda8b63f350d 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -2556,6 +2556,194 @@ static void drm_setup_crtc_rotation(struct drm_fb_helper *fb_helper,
>  	fb_helper->sw_rotations |= DRM_MODE_ROTATE_0;
>  }
>  
> +static struct drm_fb_helper_crtc *
> +drm_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
> +{
> +	int i;
> +
> +	for (i = 0; i < fb_helper->crtc_count; i++)
> +		if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
> +			return &fb_helper->crtc_info[i];
> +
> +	return NULL;
> +}
> +
> +/* Try to read the BIOS display configuration and use it for the initial config */
> +static bool drm_fb_helper_firmware_config(struct drm_fb_helper *fb_helper,
> +					  struct drm_fb_helper_crtc **crtcs,
> +					  struct drm_display_mode **modes,
> +					  struct drm_fb_offset *offsets,
> +					  bool *enabled, int width, int height)
> +{
> +	struct drm_device *dev = fb_helper->dev;
> +	unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
> +	unsigned long conn_configured, conn_seq;
> +	int i, j;
> +	bool *save_enabled;
> +	bool fallback = true, ret = true;
> +	int num_connectors_enabled = 0;
> +	int num_connectors_detected = 0;
> +	struct drm_modeset_acquire_ctx ctx;
> +
> +	save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
> +	if (!save_enabled)
> +		return false;
> +
> +	drm_modeset_acquire_init(&ctx, 0);
> +
> +	while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
> +		drm_modeset_backoff(&ctx);
> +
> +	memcpy(save_enabled, enabled, count);
> +	conn_seq = GENMASK(count - 1, 0);
> +	conn_configured = 0;
> +retry:
> +	for (i = 0; i < count; i++) {
> +		struct drm_fb_helper_connector *fb_conn;
> +		struct drm_connector *connector;
> +		struct drm_encoder *encoder;
> +		struct drm_fb_helper_crtc *new_crtc;
> +
> +		fb_conn = fb_helper->connector_info[i];
> +		connector = fb_conn->connector;
> +
> +		if (conn_configured & BIT(i))
> +			continue;
> +
> +		/* First pass, only consider tiled connectors */
> +		if (conn_seq == GENMASK(count - 1, 0) && !connector->has_tile)
> +			continue;
> +
> +		if (connector->status == connector_status_connected)
> +			num_connectors_detected++;
> +
> +		if (!enabled[i]) {
> +			DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
> +				      connector->name);
> +			conn_configured |= BIT(i);
> +			continue;
> +		}
> +
> +		if (connector->force == DRM_FORCE_OFF) {
> +			DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
> +				      connector->name);
> +			enabled[i] = false;
> +			continue;
> +		}
> +
> +		encoder = connector->state->best_encoder;

This patch breaks ast right here. Ast is a non-atomic driver and has
connector->state set to NULL. Reading best_encoder gives a NULL-pointer
dereference and the display turns black. Stack trace is below.

Best regards
Thomas


[   29.583012] [drm:drm_fb_helper_firmware_config.isra.37
[drm_kms_helper]] *ERROR* drivers/gpu/drm/drm_fb_helper.c:2649
connector=00000000db73d0b1
[   29.583048] [drm:drm_fb_helper_firmware_config.isra.37
[drm_kms_helper]] *ERROR* drivers/gpu/drm/drm_fb_helper.c:2650
connector->state=          (null)
0m] Found device[   29.609593] BUG: unable to handle kernel NULL pointer
dereference at 0000000000000010
[   29.609594] #PF error: [normal kernel read fault]
[   29.609595] PGD 0 P4D 0
[   29.609597] Oops: 0000 [#1] SMP PTI
[   29.609599] CPU: 1 PID: 354 Comm: systemd-udevd Tainted: G
 E     5.1.0-rc5-1-default+ #11
[   29.609600] Hardware name: Sun Microsystems SUN FIRE X2270 M2/SUN
FIRE X2270 M2, BIOS 2.05    07/01/2010
[   29.609608] RIP:
0010:drm_fb_helper_firmware_config.isra.37+0x2d6/0x8a0 [drm_kms_helper]
[   29.609609] Code: 48 89 de ba 5a 0a 00 00 48 c7 c7 5b 0b 48 c0 e8 60
d1 17 00 48 8b 85 e0 03 00 00 48 89 de ba 5b 0a 00 00 48 c7 c7 90 ef 47
c0 <48> 8b 48 10 e8 41 d1 17 00 ba 5d 0a 00 00 48 89 de 4c 89 ef 4b
[   29.609610] RSP: 0018:ffffb6f800c3f898 EFLAGS: 00010296
[   29.609612] RAX: 0000000000000000 RBX: ffffffffc047eec0 RCX:
0000000000000000
[   29.609612] RDX: 0000000000000a5b RSI: ffffffffc047eec0 RDI:
ffffffffc047ef90
[   29.609613] RBP: ffff9e76b6e42800 R08: 0000000000000002 R09:
0000000000000000
[   29.609614] R10: 00000000009053e2 R11: 0000000000002ae7 R12:
0000000000000000
[   29.609615] R13: ffffffffc0480b40 R14: 0000000000000000 R15:
ffff9e76b5bcac00
[   29.609616] FS:  00007f147397ef80(0000) GS:ffff9e76bb640000(0000)
knlGS:0000000000000000
[   29.609617] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   29.609618] CR2: 0000000000000010 CR3: 0000000135bd2002 CR4:
00000000000206e0
[   29.609619] Call Trace:
[   29.609630]  ? drm_helper_probe_single_connector_modes+0x27f/0x680
[drm_kms_helper]
[   29.609640]  drm_setup_crtcs+0x431/0xd80 [drm_kms_helper]
[   29.753065]  __drm_fb_helper_initial_config_and_unlock+0x6f/0x6a0
[drm_kms_helper]
[   29.753160]  ? drm_modeset_unlock_all+0x31/0x50 [drm]
 ST1000[   29.765758]  ast_fbdev_init+0xa8/0xc0 [ast]
[   29.765762]  ast_driver_load.cold.7+0x2b3/0xe11 [ast]
[   29.765775]  drm_dev_register+0x111/0x150 [drm]
[   29.765790]  drm_get_pci_dev+0x95/0x190 [drm]
[   29.765794]  local_pci_probe+0x42/0x80
[   29.765796]  pci_device_probe+0xf4/0x170
[   29.765800]  really_probe+0xf8/0x3b0
[   29.765802]  driver_probe_device+0xb3/0xf0
[   29.765805]  device_driver_attach+0x50/0x60
[   29.805092]  __driver_attach+0x86/0x140
[   29.805095]  ? device_driver_attach+0x60/0x60
[   29.805138]  bus_for_each_dev+0x63/0x90
DM010-2EP102 4   29.817250]  bus_add_driver+0x131/0x1e0
[   29.817252]  ? 0xffffffffc03e6000
0m.
[   29.817254]  driver_register+0x6b/0xb0
[   29.817255]  ? 0xffffffffc03e6000
[   29.817258]  do_one_initcall+0x46/0x1c8
[   29.817262]  ? __vunmap+0x89/0xc0
[   29.817265]  do_init_module+0x5a/0x210
[   29.817266]  load_module+0x1aff/0x1f70
[   29.817270]  ? __do_sys_finit_module+0x8f/0xd0
[   29.817271]  __do_sys_finit_module+0x8f/0xd0
[   29.817274]  do_syscall_64+0x60/0x110
[   29.817279]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   29.817280] RIP: 0033:0x7f147428b2f9
[   29.817282] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00
48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 6f 4b 0c 00 f7 d8 64 89 08
[   29.817282] RSP: 002b:00007fffa8cd4478 EFLAGS: 00000246 ORIG_RAX:
0000000000000139
[   29.817284] RAX: ffffffffffffffda RBX: 0000561801fe62e0 RCX:
00007f147428b2f9
[   29.817285] RDX: 0000000000000000 RSI: 00007f147440089d RDI:
0000000000000016
[   29.817285] RBP: 0000000000000000 R08: 0000000000000000 R09:
0000561801ffcd50
[   29.817286] R10: 0000000000000016 R11: 0000000000000246 R12:
00007f147440089d
[   29.817287] R13: 0000000000020000 R14: 0000561802006510 R15:
0000561801fe62e0
[   29.817288] Modules linked in: hid_generic(E) btrfs(E) libcrc32c(E)
usbhid(E) xor(E) ast(E+) i2c_algo_bit(E) drm_kms_helper(E)
syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_sys_fops(E) ehci_pci(E)
drm_vram_h)
[   29.817300] CR2: 0000000000000010
[   29.817311] ---[ end trace 640b47541cd2e101 ]---
[   29.827577] PM: Image not found (code -22)
[   29.830117] RIP:
0010:drm_fb_helper_firmware_config.isra.37+0x2d6/0x8a0 [drm_kms_helper]
[   29.985828] Code: 48 89 de ba 5a 0a 00 00 48 c7 c7 5b 0b 48 c0 e8 60
d1 17 00 48 8b 85 e0 03 00 00 48 89 de ba 5b 0a 00 00 48 c7 c7 90 ef 47
c0 <48> 8b 48 10 e8 41 d1 17 00 ba 5d 0a 00 00 48 89 de 4c 89 ef 4b
[   29.985829] RSP: 0018:ffffb6f800c3f898 EFLAGS: 00010296
[   29.985830] RAX: 0000000000000000 RBX: ffffffffc047eec0 RCX:
0000000000000000
[   29.985831] RDX: 0000000000000a5b RSI: ffffffffc047eec0 RDI:
ffffffffc047ef90
[   29.985832] RBP: ffff9e76b6e42800 R08: 0000000000000002 R09:
0000000000000000
[   29.985834] R10: 00000000009053e2 R11: 0000000000002ae7 R12:
0000000000000000
[   30.038589] R13: ffffffffc0480b40 R14: 0000000000000000 R15:
ffff9e76b5bcac00
[   30.038590] FS:  00007f147397ef80(0000) GS:ffff9e76bb640000(0000)
knlGS:0000000000000000
[   30.038591] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   30.038592] CR2: 0000000000000010 CR3: 0000000135bd2002 CR4:
00000000000206e0



> +		if (!encoder || WARN_ON(!connector->state->crtc)) {
> +			if (connector->force > DRM_FORCE_OFF)
> +				goto bail;
> +
> +			DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
> +				      connector->name);
> +			enabled[i] = false;
> +			conn_configured |= BIT(i);
> +			continue;
> +		}
> +
> +		num_connectors_enabled++;
> +
> +		new_crtc = drm_fb_helper_crtc(fb_helper, connector->state->crtc);
> +
> +		/*
> +		 * Make sure we're not trying to drive multiple connectors
> +		 * with a single CRTC, since our cloning support may not
> +		 * match the BIOS.
> +		 */
> +		for (j = 0; j < count; j++) {
> +			if (crtcs[j] == new_crtc) {
> +				DRM_DEBUG_KMS("fallback: cloned configuration\n");
> +				goto bail;
> +			}
> +		}
> +
> +		DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
> +			      connector->name);
> +
> +		/* go for command line mode first */
> +		modes[i] = drm_pick_cmdline_mode(fb_conn);
> +
> +		/* try for preferred next */
> +		if (!modes[i]) {
> +			DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
> +				      connector->name, connector->has_tile);
> +			modes[i] = drm_has_preferred_mode(fb_conn, width,
> +							  height);
> +		}
> +
> +		/* No preferred mode marked by the EDID? Are there any modes? */
> +		if (!modes[i] && !list_empty(&connector->modes)) {
> +			DRM_DEBUG_KMS("using first mode listed on connector %s\n",
> +				      connector->name);
> +			modes[i] = list_first_entry(&connector->modes,
> +						    struct drm_display_mode,
> +						    head);
> +		}
> +
> +		/* last resort: use current mode */
> +		if (!modes[i]) {
> +			/*
> +			 * IMPORTANT: We want to use the adjusted mode (i.e.
> +			 * after the panel fitter upscaling) as the initial
> +			 * config, not the input mode, which is what crtc->mode
> +			 * usually contains. But since our current
> +			 * code puts a mode derived from the post-pfit timings
> +			 * into crtc->mode this works out correctly.
> +			 *
> +			 * This is crtc->mode and not crtc->state->mode for the
> +			 * fastboot check to work correctly.
> +			 */
> +			DRM_DEBUG_KMS("looking for current mode on connector %s\n",
> +				      connector->name);
> +			modes[i] = &connector->state->crtc->mode;
> +		}
> +		crtcs[i] = new_crtc;
> +
> +		DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
> +			      connector->name,
> +			      connector->state->crtc->base.id,
> +			      connector->state->crtc->name,
> +			      modes[i]->hdisplay, modes[i]->vdisplay,
> +			      modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
> +
> +		fallback = false;
> +		conn_configured |= BIT(i);
> +	}
> +
> +	if (conn_configured != conn_seq) { /* repeat until no more are found */
> +		conn_seq = conn_configured;
> +		goto retry;
> +	}
> +
> +	/*
> +	 * If the BIOS didn't enable everything it could, fall back to have the
> +	 * same user experiencing of lighting up as much as possible like the
> +	 * fbdev helper library.
> +	 */
> +	if (num_connectors_enabled != num_connectors_detected &&
> +	    num_connectors_enabled < dev->mode_config.num_crtc) {
> +		DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
> +		DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
> +			      num_connectors_detected);
> +		fallback = true;
> +	}
> +
> +	if (fallback) {
> +bail:
> +		DRM_DEBUG_KMS("Not using firmware configuration\n");
> +		memcpy(enabled, save_enabled, count);
> +		ret = false;
> +	}
> +
> +	drm_modeset_drop_locks(&ctx);
> +	drm_modeset_acquire_fini(&ctx);
> +
> +	kfree(save_enabled);
> +	return ret;
> +}
> +
>  static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
>  			    u32 width, u32 height)
>  {
> @@ -2588,10 +2776,8 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
>  		DRM_DEBUG_KMS("No connectors reported connected with modes\n");
>  	drm_enable_connectors(fb_helper, enabled);
>  
> -	if (!(fb_helper->funcs->initial_config &&
> -	      fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
> -					       offsets,
> -					       enabled, width, height))) {
> +	if (!drm_fb_helper_firmware_config(fb_helper, crtcs, modes, offsets,
> +					   enabled, width, height)) {
>  		memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
>  		memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
>  		memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
> diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
> index ef93c27e60b4..c4d17dda3355 100644
> --- a/drivers/gpu/drm/i915/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/intel_fbdev.c
> @@ -284,225 +284,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
>  	return ret;
>  }
>  
> -static struct drm_fb_helper_crtc *
> -intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
> -{
> -	int i;
> -
> -	for (i = 0; i < fb_helper->crtc_count; i++)
> -		if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
> -			return &fb_helper->crtc_info[i];
> -
> -	return NULL;
> -}
> -
> -/*
> - * Try to read the BIOS display configuration and use it for the initial
> - * fb configuration.
> - *
> - * The BIOS or boot loader will generally create an initial display
> - * configuration for us that includes some set of active pipes and displays.
> - * This routine tries to figure out which pipes and connectors are active
> - * and stuffs them into the crtcs and modes array given to us by the
> - * drm_fb_helper code.
> - *
> - * The overall sequence is:
> - *   intel_fbdev_init - from driver load
> - *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
> - *     drm_fb_helper_init - build fb helper structs
> - *     drm_fb_helper_single_add_all_connectors - more fb helper structs
> - *   intel_fbdev_initial_config - apply the config
> - *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
> - *         drm_setup_crtcs - build crtc config for fbdev
> - *           intel_fb_initial_config - find active connectors etc
> - *         drm_fb_helper_single_fb_probe - set up fbdev
> - *           intelfb_create - re-use or alloc fb, build out fbdev structs
> - *
> - * Note that we don't make special consideration whether we could actually
> - * switch to the selected modes without a full modeset. E.g. when the display
> - * is in VGA mode we need to recalculate watermarks and set a new high-res
> - * framebuffer anyway.
> - */
> -static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
> -				    struct drm_fb_helper_crtc **crtcs,
> -				    struct drm_display_mode **modes,
> -				    struct drm_fb_offset *offsets,
> -				    bool *enabled, int width, int height)
> -{
> -	struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
> -	unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
> -	unsigned long conn_configured, conn_seq;
> -	int i, j;
> -	bool *save_enabled;
> -	bool fallback = true, ret = true;
> -	int num_connectors_enabled = 0;
> -	int num_connectors_detected = 0;
> -	struct drm_modeset_acquire_ctx ctx;
> -
> -	save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
> -	if (!save_enabled)
> -		return false;
> -
> -	drm_modeset_acquire_init(&ctx, 0);
> -
> -	while (drm_modeset_lock_all_ctx(fb_helper->dev, &ctx) != 0)
> -		drm_modeset_backoff(&ctx);
> -
> -	memcpy(save_enabled, enabled, count);
> -	conn_seq = GENMASK(count - 1, 0);
> -	conn_configured = 0;
> -retry:
> -	for (i = 0; i < count; i++) {
> -		struct drm_fb_helper_connector *fb_conn;
> -		struct drm_connector *connector;
> -		struct drm_encoder *encoder;
> -		struct drm_fb_helper_crtc *new_crtc;
> -
> -		fb_conn = fb_helper->connector_info[i];
> -		connector = fb_conn->connector;
> -
> -		if (conn_configured & BIT(i))
> -			continue;
> -
> -		/* First pass, only consider tiled connectors */
> -		if (conn_seq == GENMASK(count - 1, 0) && !connector->has_tile)
> -			continue;
> -
> -		if (connector->status == connector_status_connected)
> -			num_connectors_detected++;
> -
> -		if (!enabled[i]) {
> -			DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
> -				      connector->name);
> -			conn_configured |= BIT(i);
> -			continue;
> -		}
> -
> -		if (connector->force == DRM_FORCE_OFF) {
> -			DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
> -				      connector->name);
> -			enabled[i] = false;
> -			continue;
> -		}
> -
> -		encoder = connector->state->best_encoder;
> -		if (!encoder || WARN_ON(!connector->state->crtc)) {
> -			if (connector->force > DRM_FORCE_OFF)
> -				goto bail;
> -
> -			DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
> -				      connector->name);
> -			enabled[i] = false;
> -			conn_configured |= BIT(i);
> -			continue;
> -		}
> -
> -		num_connectors_enabled++;
> -
> -		new_crtc = intel_fb_helper_crtc(fb_helper,
> -						connector->state->crtc);
> -
> -		/*
> -		 * Make sure we're not trying to drive multiple connectors
> -		 * with a single CRTC, since our cloning support may not
> -		 * match the BIOS.
> -		 */
> -		for (j = 0; j < count; j++) {
> -			if (crtcs[j] == new_crtc) {
> -				DRM_DEBUG_KMS("fallback: cloned configuration\n");
> -				goto bail;
> -			}
> -		}
> -
> -		DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
> -			      connector->name);
> -
> -		/* go for command line mode first */
> -		modes[i] = drm_pick_cmdline_mode(fb_conn);
> -
> -		/* try for preferred next */
> -		if (!modes[i]) {
> -			DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
> -				      connector->name, connector->has_tile);
> -			modes[i] = drm_has_preferred_mode(fb_conn, width,
> -							  height);
> -		}
> -
> -		/* No preferred mode marked by the EDID? Are there any modes? */
> -		if (!modes[i] && !list_empty(&connector->modes)) {
> -			DRM_DEBUG_KMS("using first mode listed on connector %s\n",
> -				      connector->name);
> -			modes[i] = list_first_entry(&connector->modes,
> -						    struct drm_display_mode,
> -						    head);
> -		}
> -
> -		/* last resort: use current mode */
> -		if (!modes[i]) {
> -			/*
> -			 * IMPORTANT: We want to use the adjusted mode (i.e.
> -			 * after the panel fitter upscaling) as the initial
> -			 * config, not the input mode, which is what crtc->mode
> -			 * usually contains. But since our current
> -			 * code puts a mode derived from the post-pfit timings
> -			 * into crtc->mode this works out correctly.
> -			 *
> -			 * This is crtc->mode and not crtc->state->mode for the
> -			 * fastboot check to work correctly. crtc_state->mode has
> -			 * I915_MODE_FLAG_INHERITED, which we clear to force check
> -			 * state.
> -			 */
> -			DRM_DEBUG_KMS("looking for current mode on connector %s\n",
> -				      connector->name);
> -			modes[i] = &connector->state->crtc->mode;
> -		}
> -		crtcs[i] = new_crtc;
> -
> -		DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
> -			      connector->name,
> -			      connector->state->crtc->base.id,
> -			      connector->state->crtc->name,
> -			      modes[i]->hdisplay, modes[i]->vdisplay,
> -			      modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
> -
> -		fallback = false;
> -		conn_configured |= BIT(i);
> -	}
> -
> -	if (conn_configured != conn_seq) { /* repeat until no more are found */
> -		conn_seq = conn_configured;
> -		goto retry;
> -	}
> -
> -	/*
> -	 * If the BIOS didn't enable everything it could, fall back to have the
> -	 * same user experiencing of lighting up as much as possible like the
> -	 * fbdev helper library.
> -	 */
> -	if (num_connectors_enabled != num_connectors_detected &&
> -	    num_connectors_enabled < INTEL_INFO(dev_priv)->num_pipes) {
> -		DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
> -		DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
> -			      num_connectors_detected);
> -		fallback = true;
> -	}
> -
> -	if (fallback) {
> -bail:
> -		DRM_DEBUG_KMS("Not using firmware configuration\n");
> -		memcpy(enabled, save_enabled, count);
> -		ret = false;
> -	}
> -
> -	drm_modeset_drop_locks(&ctx);
> -	drm_modeset_acquire_fini(&ctx);
> -
> -	kfree(save_enabled);
> -	return ret;
> -}
> -
>  static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
> -	.initial_config = intel_fb_initial_config,
>  	.fb_probe = intelfb_create,
>  };
>  
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index 81ae48a0df48..4db7de19a491 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -101,29 +101,6 @@ struct drm_fb_helper_funcs {
>  	 */
>  	int (*fb_probe)(struct drm_fb_helper *helper,
>  			struct drm_fb_helper_surface_size *sizes);
> -
> -	/**
> -	 * @initial_config:
> -	 *
> -	 * Driver callback to setup an initial fbdev display configuration.
> -	 * Drivers can use this callback to tell the fbdev emulation what the
> -	 * preferred initial configuration is. This is useful to implement
> -	 * smooth booting where the fbdev (and subsequently all userspace) never
> -	 * changes the mode, but always inherits the existing configuration.
> -	 *
> -	 * This callback is optional.
> -	 *
> -	 * RETURNS:
> -	 *
> -	 * The driver should return true if a suitable initial configuration has
> -	 * been filled out and false when the fbdev helper should fall back to
> -	 * the default probing logic.
> -	 */
> -	bool (*initial_config)(struct drm_fb_helper *fb_helper,
> -			       struct drm_fb_helper_crtc **crtcs,
> -			       struct drm_display_mode **modes,
> -			       struct drm_fb_offset *offsets,
> -			       bool *enabled, int width, int height);
>  };
>  
>  struct drm_fb_helper_connector {
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)

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