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dma: ti: k3-udma: Fix rflow reservation for PKTDMA

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Driver has a bug in that it uses rflow_in_use bitmap when setting up free rflow range
from TISCI but use rflow_map for reservation in __udma_reserve_rflow()

Fix this by dropping rflow_in_use bitmap array and use rflow_map for
PKTDMA. BCDMA does not need rflow_in_use either.

This fixes CPSW3g not able to get DMA channels at R5 SPL on AM64x

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Vignesh Raghavendra 2021-12-23 19:27:30 +05:30 committed by Tom Rini
parent 584216315d
commit 4af5e5f6fd
1 changed files with 8 additions and 13 deletions
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21
drivers/dma/ti/k3-udma.c
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@ -165,7 +165,6 @@ struct udma_dev {
unsigned long *rchan_map;
unsigned long *rflow_map;
unsigned long *rflow_map_reserved;
unsigned long *rflow_in_use;
unsigned long *tflow_map;
struct udma_bchan *bchans;
@ -1448,15 +1447,11 @@ static int bcdma_setup_resources(struct udma_dev *ud)
sizeof(unsigned long), GFP_KERNEL);
ud->rchans = devm_kcalloc(dev, ud->rchan_cnt, sizeof(*ud->rchans),
GFP_KERNEL);
/* BCDMA do not really have flows, but the driver expect it */
ud->rflow_in_use = devm_kcalloc(dev, BITS_TO_LONGS(ud->rchan_cnt),
sizeof(unsigned long),
GFP_KERNEL);
ud->rflows = devm_kcalloc(dev, ud->rchan_cnt, sizeof(*ud->rflows),
GFP_KERNEL);
if (!ud->bchan_map || !ud->tchan_map || !ud->rchan_map ||
!ud->rflow_in_use || !ud->bchans || !ud->tchans || !ud->rchans ||
!ud->bchans || !ud->tchans || !ud->rchans ||
!ud->rflows)
return -ENOMEM;
@ -1535,16 +1530,16 @@ static int pktdma_setup_resources(struct udma_dev *ud)
sizeof(unsigned long), GFP_KERNEL);
ud->rchans = devm_kcalloc(dev, ud->rchan_cnt, sizeof(*ud->rchans),
GFP_KERNEL);
ud->rflow_in_use = devm_kcalloc(dev, BITS_TO_LONGS(ud->rflow_cnt),
sizeof(unsigned long),
GFP_KERNEL);
ud->rflow_map = devm_kcalloc(dev, BITS_TO_LONGS(ud->rflow_cnt),
sizeof(unsigned long),
GFP_KERNEL);
ud->rflows = devm_kcalloc(dev, ud->rflow_cnt, sizeof(*ud->rflows),
GFP_KERNEL);
ud->tflow_map = devm_kmalloc_array(dev, BITS_TO_LONGS(ud->tflow_cnt),
sizeof(unsigned long), GFP_KERNEL);
if (!ud->tchan_map || !ud->rchan_map || !ud->tflow_map || !ud->tchans ||
!ud->rchans || !ud->rflows || !ud->rflow_in_use)
!ud->rchans || !ud->rflows || !ud->rflow_map)
return -ENOMEM;
/* Get resource ranges from tisci */
@ -1592,12 +1587,12 @@ static int pktdma_setup_resources(struct udma_dev *ud)
rm_res = tisci_rm->rm_ranges[RM_RANGE_RFLOW];
if (IS_ERR(rm_res)) {
/* all rflows are assigned exclusively to Linux */
bitmap_zero(ud->rflow_in_use, ud->rflow_cnt);
bitmap_zero(ud->rflow_map, ud->rflow_cnt);
} else {
bitmap_fill(ud->rflow_in_use, ud->rflow_cnt);
bitmap_fill(ud->rflow_map, ud->rflow_cnt);
for (i = 0; i < rm_res->sets; i++) {
rm_desc = &rm_res->desc[i];
bitmap_clear(ud->rflow_in_use, rm_desc->start,
bitmap_clear(ud->rflow_map, rm_desc->start,
rm_desc->num);
dev_dbg(dev, "ti-sci-res: rflow: %d:%d\n",
rm_desc->start, rm_desc->num);