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

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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: Thomas Dedinsky <tdedinsk@codeaurora.org>
This commit is contained in:
Thomas Dedinsky
2020-03-26 11:11:53 -04:00
parent 244be03e47
commit 80acdaa9f8
1 changed files with 14 additions and 4 deletions
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18
msm/sde/sde_rm.c
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@@ -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;