On Tue, 26 Mar 2019, Noralf Trønnes <nor...@tronnes.org> wrote:
> 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
This holds after intel_modeset_init(), in time for the use here.
> Suggested-by: Daniel Vetter <daniel.vet...@ffwll.ch>
> Cc: Jani Nikula <jani.nik...@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> Cc: intel-...@lists.freedesktop.org
> Signed-off-by: Noralf Trønnes <nor...@tronnes.org>
Reviewed-by: Jani Nikula <jani.nik...@intel.com>
and
Acked-by: Jani Nikula <jani.nik...@intel.com>
for merging via drm-misc or whichever tree makes most sense.
> ---
> 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 36310901e935..634f4dcf0c41 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -2545,6 +2545,194 @@ static int drm_pick_crtcs(struct drm_fb_helper
> *fb_helper,
> return best_score;
> }
>
> +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;
> + 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)
> {
> @@ -2577,10 +2765,8 @@ 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 e8f694b57b8a..20e91600cf71 100644
> --- a/drivers/gpu/drm/i915/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/intel_fbdev.c
> @@ -292,225 +292,7 @@ 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 7a095964f6b2..bca4b34dc93b 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -100,29 +100,6 @@ 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 {
--
Jani Nikula, Intel Open Source Graphics Center
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