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Message-ID: <20211209180715.27998-1-vigneshr@ti.com>
Date: Thu, 9 Dec 2021 23:37:15 +0530
From: Vignesh Raghavendra <vigneshr@...com>
To: Peter Ujfalusi <peter.ujfalusi@...il.com>,
Vinod Koul <vkoul@...nel.org>
CC: <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Vignesh Raghavendra <vigneshr@...com>,
Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH] dma: ti: k3-udma: Workaround errata i2234
Per [1], UDMA TR15 transactions may hang if ICNT0 is less than 64B
Work around is to set EOL flag is to 1 for ICNT0.
Since, there is no performance penalty / side effects of setting EOL
flag event ICNTO > 64B, just set the flag for all UDMAP TR15
descriptors.
[1] https://www.ti.com/lit/er/sprz455a/sprz455a.pdf
Errata doc for J721E DRA829/TDA4VM Processors Silicon Revision 1.1/1.0 (Rev. A)
Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
---
drivers/dma/ti/k3-udma.c | 48 +++++++++++++++++++-----------------
include/linux/dma/ti-cppi5.h | 1 +
2 files changed, 27 insertions(+), 22 deletions(-)
diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 6e56d1cef5ee..d65c4cc5fbf7 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -2863,6 +2863,7 @@ udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
struct udma_desc *d;
struct cppi5_tr_type1_t *tr_req = NULL;
u16 tr0_cnt0, tr0_cnt1, tr1_cnt0;
+ u32 csf = CPPI5_TR_CSF_SUPR_EVT;
unsigned int i;
size_t tr_size;
int num_tr = 0;
@@ -2885,10 +2886,12 @@ udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
d->sglen = sglen;
- if (uc->ud->match_data->type == DMA_TYPE_UDMA)
+ if (uc->ud->match_data->type == DMA_TYPE_UDMA) {
asel = 0;
- else
+ csf |= CPPI5_TR_CSF_EOL_ICNT0;
+ } else {
asel = (u64)uc->config.asel << K3_ADDRESS_ASEL_SHIFT;
+ }
tr_req = d->hwdesc[0].tr_req_base;
for_each_sg(sgl, sgent, sglen, i) {
@@ -2906,7 +2909,7 @@ udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE1, false,
false, CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
- cppi5_tr_csf_set(&tr_req[tr_idx].flags, CPPI5_TR_CSF_SUPR_EVT);
+ cppi5_tr_csf_set(&tr_req[tr_idx].flags, csf);
sg_addr |= asel;
tr_req[tr_idx].addr = sg_addr;
@@ -2919,8 +2922,7 @@ udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE1,
false, false,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
- cppi5_tr_csf_set(&tr_req[tr_idx].flags,
- CPPI5_TR_CSF_SUPR_EVT);
+ cppi5_tr_csf_set(&tr_req[tr_idx].flags, csf);
tr_req[tr_idx].addr = sg_addr + tr0_cnt1 * tr0_cnt0;
tr_req[tr_idx].icnt0 = tr1_cnt0;
@@ -2932,8 +2934,7 @@ udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
d->residue += sg_dma_len(sgent);
}
- cppi5_tr_csf_set(&tr_req[tr_idx - 1].flags,
- CPPI5_TR_CSF_SUPR_EVT | CPPI5_TR_CSF_EOP);
+ cppi5_tr_csf_set(&tr_req[tr_idx - 1].flags, csf | CPPI5_TR_CSF_EOP);
return d;
}
@@ -2947,6 +2948,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc, struct scatterlist *sgl,
struct scatterlist *sgent;
struct cppi5_tr_type15_t *tr_req = NULL;
enum dma_slave_buswidth dev_width;
+ u32 csf = CPPI5_TR_CSF_SUPR_EVT;
u16 tr_cnt0, tr_cnt1;
dma_addr_t dev_addr;
struct udma_desc *d;
@@ -3017,6 +3019,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc, struct scatterlist *sgl,
if (uc->ud->match_data->type == DMA_TYPE_UDMA) {
asel = 0;
+ csf |= CPPI5_TR_CSF_EOL_ICNT0;
} else {
asel = (u64)uc->config.asel << K3_ADDRESS_ASEL_SHIFT;
dev_addr |= asel;
@@ -3040,7 +3043,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc, struct scatterlist *sgl,
cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE15, false,
true, CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
- cppi5_tr_csf_set(&tr_req[tr_idx].flags, CPPI5_TR_CSF_SUPR_EVT);
+ cppi5_tr_csf_set(&tr_req[tr_idx].flags, csf);
cppi5_tr_set_trigger(&tr_req[tr_idx].flags,
uc->config.tr_trigger_type,
CPPI5_TR_TRIGGER_TYPE_ICNT2_DEC, 0, 0);
@@ -3086,8 +3089,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc, struct scatterlist *sgl,
cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE15,
false, true,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
- cppi5_tr_csf_set(&tr_req[tr_idx].flags,
- CPPI5_TR_CSF_SUPR_EVT);
+ cppi5_tr_csf_set(&tr_req[tr_idx].flags, csf);
cppi5_tr_set_trigger(&tr_req[tr_idx].flags,
uc->config.tr_trigger_type,
CPPI5_TR_TRIGGER_TYPE_ICNT2_DEC,
@@ -3131,8 +3133,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc, struct scatterlist *sgl,
d->residue += sg_len;
}
- cppi5_tr_csf_set(&tr_req[tr_idx - 1].flags,
- CPPI5_TR_CSF_SUPR_EVT | CPPI5_TR_CSF_EOP);
+ cppi5_tr_csf_set(&tr_req[tr_idx - 1].flags, csf | CPPI5_TR_CSF_EOP);
return d;
}
@@ -3454,6 +3455,7 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
struct cppi5_tr_type1_t *tr_req;
unsigned int periods = buf_len / period_len;
u16 tr0_cnt0, tr0_cnt1, tr1_cnt0;
+ u32 csf = CPPI5_TR_CSF_SUPR_EVT;
unsigned int i;
int num_tr;
@@ -3472,11 +3474,13 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
return NULL;
tr_req = d->hwdesc[0].tr_req_base;
- if (uc->ud->match_data->type == DMA_TYPE_UDMA)
+ if (uc->ud->match_data->type == DMA_TYPE_UDMA) {
period_addr = buf_addr;
- else
+ csf |= CPPI5_TR_CSF_EOL_ICNT0;
+ } else {
period_addr = buf_addr |
((u64)uc->config.asel << K3_ADDRESS_ASEL_SHIFT);
+ }
for (i = 0; i < periods; i++) {
int tr_idx = i * num_tr;
@@ -3490,8 +3494,7 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
tr_req[tr_idx].dim1 = tr0_cnt0;
if (num_tr == 2) {
- cppi5_tr_csf_set(&tr_req[tr_idx].flags,
- CPPI5_TR_CSF_SUPR_EVT);
+ cppi5_tr_csf_set(&tr_req[tr_idx].flags, csf);
tr_idx++;
cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE1,
@@ -3505,8 +3508,7 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
}
if (!(flags & DMA_PREP_INTERRUPT))
- cppi5_tr_csf_set(&tr_req[tr_idx].flags,
- CPPI5_TR_CSF_SUPR_EVT);
+ cppi5_tr_csf_set(&tr_req[tr_idx].flags, csf);
period_addr += period_len;
}
@@ -3659,6 +3661,7 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
int num_tr;
size_t tr_size = sizeof(struct cppi5_tr_type15_t);
u16 tr0_cnt0, tr0_cnt1, tr1_cnt0;
+ u32 csf = CPPI5_TR_CSF_SUPR_EVT;
if (uc->config.dir != DMA_MEM_TO_MEM) {
dev_err(chan->device->dev,
@@ -3689,13 +3692,15 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
if (uc->ud->match_data->type != DMA_TYPE_UDMA) {
src |= (u64)uc->ud->asel << K3_ADDRESS_ASEL_SHIFT;
dest |= (u64)uc->ud->asel << K3_ADDRESS_ASEL_SHIFT;
+ } else {
+ csf |= CPPI5_TR_CSF_EOL_ICNT0;
}
tr_req = d->hwdesc[0].tr_req_base;
cppi5_tr_init(&tr_req[0].flags, CPPI5_TR_TYPE15, false, true,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
- cppi5_tr_csf_set(&tr_req[0].flags, CPPI5_TR_CSF_SUPR_EVT);
+ cppi5_tr_csf_set(&tr_req[0].flags, csf);
tr_req[0].addr = src;
tr_req[0].icnt0 = tr0_cnt0;
@@ -3714,7 +3719,7 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
if (num_tr == 2) {
cppi5_tr_init(&tr_req[1].flags, CPPI5_TR_TYPE15, false, true,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
- cppi5_tr_csf_set(&tr_req[1].flags, CPPI5_TR_CSF_SUPR_EVT);
+ cppi5_tr_csf_set(&tr_req[1].flags, csf);
tr_req[1].addr = src + tr0_cnt1 * tr0_cnt0;
tr_req[1].icnt0 = tr1_cnt0;
@@ -3729,8 +3734,7 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
tr_req[1].dicnt3 = 1;
}
- cppi5_tr_csf_set(&tr_req[num_tr - 1].flags,
- CPPI5_TR_CSF_SUPR_EVT | CPPI5_TR_CSF_EOP);
+ cppi5_tr_csf_set(&tr_req[num_tr - 1].flags, csf | CPPI5_TR_CSF_EOP);
if (uc->config.metadata_size)
d->vd.tx.metadata_ops = &metadata_ops;
diff --git a/include/linux/dma/ti-cppi5.h b/include/linux/dma/ti-cppi5.h
index efa2f0309f00..c53c0f6e3b1a 100644
--- a/include/linux/dma/ti-cppi5.h
+++ b/include/linux/dma/ti-cppi5.h
@@ -616,6 +616,7 @@ static inline void *cppi5_hdesc_get_swdata(struct cppi5_host_desc_t *desc)
#define CPPI5_TR_CSF_SUPR_EVT BIT(2)
#define CPPI5_TR_CSF_EOL_ADV_SHIFT (4U)
#define CPPI5_TR_CSF_EOL_ADV_MASK GENMASK(6, 4)
+#define CPPI5_TR_CSF_EOL_ICNT0 BIT(4)
#define CPPI5_TR_CSF_EOP BIT(7)
/**
--
2.34.1
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