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

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>

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 411edef..86603d4 100644 (file)
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -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);