[PATCH v2 03/12] drm/i915/fbdev: Move intel_fb_initial_config() to fbdev helper
Noralf Trønnes
noralf at tronnes.org
Tue Apr 23 14:58:07 UTC 2019
Den 23.04.2019 16.17, skrev Thomas Zimmermann:
> 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 at ffwll.ch>
>> Cc: Jani Nikula <jani.nikula at linux.intel.com>
>> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
>> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
>> Cc: intel-gfx at lists.freedesktop.org
>> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
>> Reviewed-by: Jani Nikula <jani.nikula at intel.com>
>> ---
>> 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.
>
Thanks for the report, I've sent a fix.
Noralf.
> 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 {
>>
>
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