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PCI: tegra194: Ring doorbell If DMA is not running

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Issue:
During multi threaded testing, there are cases where EDMA HW enters
stopped state even through there are pending descriptors to process.
This happens even when doorbell is rung after updating descriptors and
barriers places.

Fix:
After processing channel interrupt, ring doorbell, if there are pending
descriptors and for that channel is not running.

Bug 4111305

Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2905177
Change-Id: I9d1bd391f690abc58cf262f62606c42504150b13
Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2910921
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Nagarjuna Kristam
2023-05-16 13:28:23 +05:30
committed by mobile promotions
parent 37956be9b4
commit 55e4803b61
1 changed files with 24 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/pci/controller/tegra-pcie-edma.c
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@@ -326,6 +326,24 @@ static irqreturn_t edma_irq(int irq, void *cookie)
return IRQ_WAKE_THREAD;
}
static void edma_check_and_ring_db(struct edma_prv *prv, u8 bit, u32 ctrl_off, u32 db_off)
{
u32 reg = dma_channel_rd(prv->edma_base, bit, ctrl_off);
#define CS_POS 5U
#define CS_MASK (OSI_BIT(5) | OSI_BIT(6))
#define CS_RUNNING 2U
reg &= CS_MASK;
reg >>= CS_POS;
/*
* There are pending descriptors to process, but
* EDMA HW is not running. Ring the doorbell again
* to ensure that descriptors are processed.
*/
if (reg != CS_RUNNING)
dma_common_wr(prv->edma_base, bit, db_off);
}
static irqreturn_t edma_irq_handler(int irq, void *cookie)
{
struct edma_prv *prv = (struct edma_prv *)cookie;
@@ -336,6 +354,8 @@ static irqreturn_t edma_irq_handler(int irq, void *cookie)
u32 int_status_off[2] = {DMA_WRITE_INT_STATUS_OFF, DMA_READ_INT_STATUS_OFF};
u32 int_clear_off[2] = {DMA_WRITE_INT_CLEAR_OFF, DMA_READ_INT_CLEAR_OFF};
u32 mode_cnt[2] = {DMA_WR_CHNL_NUM, DMA_RD_CHNL_NUM};
u32 ctrl_off[2] = {DMA_CH_CONTROL1_OFF_WRCH, DMA_CH_CONTROL1_OFF_RDCH};
u32 db_off[2] = {DMA_WRITE_DOORBELL_OFF, DMA_READ_DOORBELL_OFF};
for (i = 0; i < 2; i++) {
if (!(prv->ch_init & OSI_BIT(i)))
@@ -383,6 +403,10 @@ static irqreturn_t edma_irq_handler(int irq, void *cookie)
dma_common_wr(prv->edma_base, OSI_BIT(bit),
int_clear_off[i]);
process_ch_irq(prv, bit, ch, i);
/* Check if there are pending descriptors */
if (ch->w_idx != ch->r_idx)
edma_check_and_ring_db(prv, (u8)(bit & 0xFF),
ctrl_off[i], db_off[i]);
}
}
}