[Intel-gfx] [PATCH 14/58] drm/i915: copy&paste drm_crtc_helper_set_config
Jesse Barnes
jbarnes at virtuousgeek.org
Tue Sep 4 22:13:20 CEST 2012
On Sun, 19 Aug 2012 21:12:31 +0200
Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> And the following static functions required by it:
> drm_encoder_crtc_ok, drm_crtc_helper_disable
>
> No changes safe for the s/drm/intel prefix change.
>
> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
> drivers/gpu/drm/i915/intel_display.c | 314 ++++++++++++++++++++++++++++++++++-
> 1 file changed, 313 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 07077b1..33a5191 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6590,12 +6590,324 @@ static struct drm_crtc_helper_funcs intel_helper_funcs = {
> .disable = intel_crtc_disable,
> };
>
> +static bool intel_encoder_crtc_ok(struct drm_encoder *encoder,
> + struct drm_crtc *crtc)
> +{
> + struct drm_device *dev;
> + struct drm_crtc *tmp;
> + int crtc_mask = 1;
> +
> + WARN(!crtc, "checking null crtc?\n");
> +
> + dev = crtc->dev;
> +
> + list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
> + if (tmp == crtc)
> + break;
> + crtc_mask <<= 1;
> + }
> +
> + if (encoder->possible_crtcs & crtc_mask)
> + return true;
> + return false;
> +}
> +
> +static int
> +intel_crtc_helper_disable(struct drm_crtc *crtc)
> +{
> + struct drm_device *dev = crtc->dev;
> + struct drm_connector *connector;
> + struct drm_encoder *encoder;
> +
> + /* Decouple all encoders and their attached connectors from this crtc */
> + list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
> + if (encoder->crtc != crtc)
> + continue;
> +
> + list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
> + if (connector->encoder != encoder)
> + continue;
> +
> + connector->encoder = NULL;
> + }
> + }
> +
> + drm_helper_disable_unused_functions(dev);
> + return 0;
> +}
> +
> +static int intel_crtc_set_config(struct drm_mode_set *set)
> +{
> + struct drm_device *dev;
> + struct drm_crtc *save_crtcs, *new_crtc, *crtc;
> + struct drm_encoder *save_encoders, *new_encoder, *encoder;
> + struct drm_framebuffer *old_fb = NULL;
> + bool mode_changed = false; /* if true do a full mode set */
> + bool fb_changed = false; /* if true and !mode_changed just do a flip */
> + struct drm_connector *save_connectors, *connector;
> + int count = 0, ro, fail = 0;
> + struct drm_crtc_helper_funcs *crtc_funcs;
> + struct drm_mode_set save_set;
> + int ret;
> + int i;
> +
> + DRM_DEBUG_KMS("\n");
> +
> + if (!set)
> + return -EINVAL;
> +
> + if (!set->crtc)
> + return -EINVAL;
> +
> + if (!set->crtc->helper_private)
> + return -EINVAL;
> +
> + crtc_funcs = set->crtc->helper_private;
> +
> + if (!set->mode)
> + set->fb = NULL;
> +
> + if (set->fb) {
> + DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
> + set->crtc->base.id, set->fb->base.id,
> + (int)set->num_connectors, set->x, set->y);
> + } else {
> + DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
> + return intel_crtc_helper_disable(set->crtc);
> + }
> +
> + dev = set->crtc->dev;
> +
> + /* Allocate space for the backup of all (non-pointer) crtc, encoder and
> + * connector data. */
> + save_crtcs = kzalloc(dev->mode_config.num_crtc *
> + sizeof(struct drm_crtc), GFP_KERNEL);
> + if (!save_crtcs)
> + return -ENOMEM;
> +
> + save_encoders = kzalloc(dev->mode_config.num_encoder *
> + sizeof(struct drm_encoder), GFP_KERNEL);
> + if (!save_encoders) {
> + kfree(save_crtcs);
> + return -ENOMEM;
> + }
> +
> + save_connectors = kzalloc(dev->mode_config.num_connector *
> + sizeof(struct drm_connector), GFP_KERNEL);
> + if (!save_connectors) {
> + kfree(save_crtcs);
> + kfree(save_encoders);
> + return -ENOMEM;
> + }
> +
> + /* Copy data. Note that driver private data is not affected.
> + * Should anything bad happen only the expected state is
> + * restored, not the drivers personal bookkeeping.
> + */
> + count = 0;
> + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
> + save_crtcs[count++] = *crtc;
> + }
> +
> + count = 0;
> + list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
> + save_encoders[count++] = *encoder;
> + }
> +
> + count = 0;
> + list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
> + save_connectors[count++] = *connector;
> + }
> +
> + save_set.crtc = set->crtc;
> + save_set.mode = &set->crtc->mode;
> + save_set.x = set->crtc->x;
> + save_set.y = set->crtc->y;
> + save_set.fb = set->crtc->fb;
> +
> + /* We should be able to check here if the fb has the same properties
> + * and then just flip_or_move it */
> + if (set->crtc->fb != set->fb) {
> + /* If we have no fb then treat it as a full mode set */
> + if (set->crtc->fb == NULL) {
> + DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
> + mode_changed = true;
> + } else if (set->fb == NULL) {
> + mode_changed = true;
> + } else if (set->fb->depth != set->crtc->fb->depth) {
> + mode_changed = true;
> + } else if (set->fb->bits_per_pixel !=
> + set->crtc->fb->bits_per_pixel) {
> + mode_changed = true;
> + } else
> + fb_changed = true;
> + }
> +
> + if (set->x != set->crtc->x || set->y != set->crtc->y)
> + fb_changed = true;
> +
> + if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
> + DRM_DEBUG_KMS("modes are different, full mode set\n");
> + drm_mode_debug_printmodeline(&set->crtc->mode);
> + drm_mode_debug_printmodeline(set->mode);
> + mode_changed = true;
> + }
> +
> + /* a) traverse passed in connector list and get encoders for them */
> + count = 0;
> + list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
> + struct drm_connector_helper_funcs *connector_funcs =
> + connector->helper_private;
> + new_encoder = connector->encoder;
> + for (ro = 0; ro < set->num_connectors; ro++) {
> + if (set->connectors[ro] == connector) {
> + new_encoder = connector_funcs->best_encoder(connector);
> + /* if we can't get an encoder for a connector
> + we are setting now - then fail */
> + if (new_encoder == NULL)
> + /* don't break so fail path works correct */
> + fail = 1;
> + break;
> + }
> + }
> +
> + if (new_encoder != connector->encoder) {
> + DRM_DEBUG_KMS("encoder changed, full mode switch\n");
> + mode_changed = true;
> + /* If the encoder is reused for another connector, then
> + * the appropriate crtc will be set later.
> + */
> + if (connector->encoder)
> + connector->encoder->crtc = NULL;
> + connector->encoder = new_encoder;
> + }
> + }
> +
> + if (fail) {
> + ret = -EINVAL;
> + goto fail;
> + }
> +
> + count = 0;
> + list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
> + if (!connector->encoder)
> + continue;
> +
> + if (connector->encoder->crtc == set->crtc)
> + new_crtc = NULL;
> + else
> + new_crtc = connector->encoder->crtc;
> +
> + for (ro = 0; ro < set->num_connectors; ro++) {
> + if (set->connectors[ro] == connector)
> + new_crtc = set->crtc;
> + }
> +
> + /* Make sure the new CRTC will work with the encoder */
> + if (new_crtc &&
> + !intel_encoder_crtc_ok(connector->encoder, new_crtc)) {
> + ret = -EINVAL;
> + goto fail;
> + }
> + if (new_crtc != connector->encoder->crtc) {
> + DRM_DEBUG_KMS("crtc changed, full mode switch\n");
> + mode_changed = true;
> + connector->encoder->crtc = new_crtc;
> + }
> + if (new_crtc) {
> + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
> + connector->base.id, drm_get_connector_name(connector),
> + new_crtc->base.id);
> + } else {
> + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
> + connector->base.id, drm_get_connector_name(connector));
> + }
> + }
> +
> + /* mode_set_base is not a required function */
> + if (fb_changed && !crtc_funcs->mode_set_base)
> + mode_changed = true;
> +
> + if (mode_changed) {
> + set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
> + if (set->crtc->enabled) {
> + DRM_DEBUG_KMS("attempting to set mode from"
> + " userspace\n");
> + drm_mode_debug_printmodeline(set->mode);
> + old_fb = set->crtc->fb;
> + set->crtc->fb = set->fb;
> + if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
> + set->x, set->y,
> + old_fb)) {
> + DRM_ERROR("failed to set mode on [CRTC:%d]\n",
> + set->crtc->base.id);
> + set->crtc->fb = old_fb;
> + ret = -EINVAL;
> + goto fail;
> + }
> + DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
> + for (i = 0; i < set->num_connectors; i++) {
> + DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
> + drm_get_connector_name(set->connectors[i]));
> + set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
> + }
> + }
> + drm_helper_disable_unused_functions(dev);
> + } else if (fb_changed) {
> + set->crtc->x = set->x;
> + set->crtc->y = set->y;
> +
> + old_fb = set->crtc->fb;
> + if (set->crtc->fb != set->fb)
> + set->crtc->fb = set->fb;
> + ret = crtc_funcs->mode_set_base(set->crtc,
> + set->x, set->y, old_fb);
> + if (ret != 0) {
> + set->crtc->fb = old_fb;
> + goto fail;
> + }
> + }
> +
> + kfree(save_connectors);
> + kfree(save_encoders);
> + kfree(save_crtcs);
> + return 0;
> +
> +fail:
> + /* Restore all previous data. */
> + count = 0;
> + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
> + *crtc = save_crtcs[count++];
> + }
> +
> + count = 0;
> + list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
> + *encoder = save_encoders[count++];
> + }
> +
> + count = 0;
> + list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
> + *connector = save_connectors[count++];
> + }
> +
> + /* Try to restore the config */
> + if (mode_changed &&
> + !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
> + save_set.y, save_set.fb))
> + DRM_ERROR("failed to restore config after modeset failure\n");
> +
> + kfree(save_connectors);
> + kfree(save_encoders);
> + kfree(save_crtcs);
> + return ret;
> +}
> +
> static const struct drm_crtc_funcs intel_crtc_funcs = {
> .reset = intel_crtc_reset,
> .cursor_set = intel_crtc_cursor_set,
> .cursor_move = intel_crtc_cursor_move,
> .gamma_set = intel_crtc_gamma_set,
> - .set_config = drm_crtc_helper_set_config,
> + .set_config = intel_crtc_set_config,
> .destroy = intel_crtc_destroy,
> .page_flip = intel_crtc_page_flip,
> };
Acked-by: Jesse Barnes <jbarnes at virtuousgeek.org> (I did not check
line-by-line but it looks like the right shape :).
--
Jesse Barnes, Intel Open Source Technology Center
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