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Date: Mon, 13 Dec 2021 11:06:34 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Vignesh Raghavendra <vigneshr@...com>
Cc: Peter Ujfalusi <peter.ujfalusi@...il.com>,
dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] dma: ti: k3-udma: Workaround errata i2234
On 09-12-21, 23:37, Vignesh Raghavendra wrote:
> 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.
s/dma/dmaengine
>
> [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
--
~Vinod
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