Hi Am 04.12.20 um 16:11 schrieb Maxime Ripard:
The HVS state now has both unassigned_channels that reflects the channels that are not used in the associated state, and the in_use boolean for each channel that says whether or not a particular channel is in use.Both express pretty much the same thing, and we need the in_use variable to properly track the commits, so let's get rid of unassigned_channels. Suggested-by: Thomas Zimmermann <tzimmerm...@suse.de> Signed-off-by: Maxime Ripard <max...@cerno.tech> --- drivers/gpu/drm/vc4/vc4_kms.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index fdd698df5fbe..fa40c44eb770 100644 --- a/drivers/gpu/drm/vc4/vc4_kms.c +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -39,7 +39,6 @@ static struct vc4_ctm_state *to_vc4_ctm_state(struct drm_private_state *priv)struct vc4_hvs_state {struct drm_private_state base; - unsigned int unassigned_channels;struct {unsigned in_use: 1; @@ -798,7 +797,6 @@ vc4_hvs_channels_duplicate_state(struct drm_private_obj *obj)__drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); - state->unassigned_channels = old_state->unassigned_channels; for (i = 0; i < HVS_NUM_CHANNELS; i++) {state->fifo_state[i].in_use = old_state->fifo_state[i].in_use; @@ -849,7 +847,6 @@ static int vc4_hvs_channels_obj_init(struct vc4_dev *vc4) if (!state) return -ENOMEM;- state->unassigned_channels = GENMASK(HVS_NUM_CHANNELS - 1, 0);drm_atomic_private_obj_init(&vc4->base, &vc4->hvs_channels, &state->base, &vc4_hvs_state_funcs); @@ -893,12 +890,17 @@ static int vc4_pv_muxing_atomic_check(struct drm_device *dev, struct vc4_hvs_state *hvs_new_state; struct drm_crtc_state *old_crtc_state, *new_crtc_state; struct drm_crtc *crtc; + unsigned int unassigned_channels; unsigned int i;hvs_new_state = vc4_hvs_get_global_state(state);if (!hvs_new_state) return -EINVAL;+ for (i = 0; i < HVS_NUM_CHANNELS; i++)+ if (!hvs_new_state->fifo_state[i].in_use) + unassigned_channels |= BIT(i); +
More of a nit: I'd turn this block into a helper of struct vc4_hvs_state. That would also remove the need to initialize unassigned_channels to 0 here.
For the loop's condition, it might be less error prone to use ARRAY_SIZE(hvs_new_state->fifo_state) instead of HVS_NUM_CHANNEL.
In any case Reviewed-by: Thomas Zimmermann <tzimmerm...@suse.de> Best regards Thomas
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { struct vc4_crtc_state *old_vc4_crtc_state = to_vc4_crtc_state(old_crtc_state); @@ -918,8 +920,6 @@ static int vc4_pv_muxing_atomic_check(struct drm_device *dev, /* If we're disabling our CRTC, we put back our channel */ if (!new_crtc_state->enable) { channel = old_vc4_crtc_state->assigned_channel; - - hvs_new_state->unassigned_channels |= BIT(channel); hvs_new_state->fifo_state[channel].in_use = false; new_vc4_crtc_state->assigned_channel = VC4_HVS_CHANNEL_DISABLED; continue; @@ -949,13 +949,13 @@ static int vc4_pv_muxing_atomic_check(struct drm_device *dev, * the future, we will need to have something smarter, * but it works so far. */ - matching_channels = hvs_new_state->unassigned_channels & vc4_crtc->data->hvs_available_channels; + matching_channels = unassigned_channels & vc4_crtc->data->hvs_available_channels; if (!matching_channels) return -EINVAL;channel = ffs(matching_channels) - 1;new_vc4_crtc_state->assigned_channel = channel; - hvs_new_state->unassigned_channels &= ~BIT(channel); + unassigned_channels &= ~BIT(channel); hvs_new_state->fifo_state[channel].in_use = true; }
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
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