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Commit 80acdaa9 authored by Thomas Dedinsky's avatar Thomas Dedinsky
Browse files

drm: msm: sde: reserve DSC in pairs for 4DSC topologies 



Reserve DSC in the sequence of primary-peer and then
primary-peer again until all required DSC are reserved.

Searching sequence will not change for single/dual DSC
reservation. For single DSC reservation it will return
right after the first primary DSC is found. For dual DSC
reservation it will return after the first primary-peer
pair is found.

The logic can also work for triple/quad or any number
of DSC reservetion and make sure that all the reserved
DSCs are in pairs except the last one if total DSC number
is odd.

Change-Id: I5b90d54822ce16ef829e7c657c1b14e7a484c65a
Signed-off-by: default avatarThomas Dedinsky <tdedinsk@codeaurora.org>
parent 244be03e

msm/sde/sde_rm.c

+14 −4
Original line number Diff line number Diff line
@@ -1279,6 +1279,7 @@ static int _sde_rm_reserve_dsc( 
{

	struct sde_rm_hw_iter iter_i, iter_j;

	struct sde_rm_hw_blk *dsc[MAX_BLOCKS];

	u32 reserve_mask = 0;

	int alloc_count = 0;

	int num_dsc_enc = top->num_comp_enc;

	int i;
@@ -1301,8 +1302,8 @@ static int _sde_rm_reserve_dsc( 
		bool has_422_420_support =

			BIT(SDE_DSC_NATIVE_422_EN) & features;



		memset(&dsc, 0, sizeof(dsc));

		alloc_count = 0;

		if (reserve_mask & (1 << iter_i.blk->id))

			continue;



		if (_dsc_ids && (iter_i.blk->id != _dsc_ids[alloc_count]))

			continue;
@@ -1320,6 +1321,7 @@ static int _sde_rm_reserve_dsc( 
			alloc_count,

			_dsc_ids ? _dsc_ids[alloc_count] : -1);



		reserve_mask |= (1 << iter_i.blk->id);

		dsc[alloc_count++] = iter_i.blk;



		/* Valid first dsc found, find matching peers */
@@ -1327,7 +1329,7 @@ static int _sde_rm_reserve_dsc( 


		while (alloc_count != num_dsc_enc &&

				_sde_rm_get_hw_locked(rm, &iter_j)) {

			if (iter_i.blk == iter_j.blk)

			if (reserve_mask & (1 << iter_j.blk->id))

				continue;



			if (_dsc_ids && (iter_j.blk->id !=
@@ -1343,7 +1345,15 @@ static int _sde_rm_reserve_dsc( 
				alloc_count,

				_dsc_ids ? _dsc_ids[alloc_count] : -1);



			reserve_mask |= (1 << iter_j.blk->id);

			dsc[alloc_count++] = iter_j.blk;

			break;

		}



		/* Rollback primary DSC if peer is not found */

		if (!iter_j.hw) {

			reserve_mask &= ~(1 << iter_i.blk->id);

			--alloc_count;

		}

	}
@@ -1353,7 +1363,7 @@ static int _sde_rm_reserve_dsc( 
		return -EINVAL;

	}



	for (i = 0; i < ARRAY_SIZE(dsc); i++) {

	for (i = 0; i < alloc_count; i++) {

		if (!dsc[i])

			break;