From nobody Sun Feb 8 11:22:07 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0ED2AC6FD1C for ; Thu, 23 Mar 2023 12:03:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231789AbjCWMDQ (ORCPT ); Thu, 23 Mar 2023 08:03:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229563AbjCWMCz (ORCPT ); Thu, 23 Mar 2023 08:02:55 -0400 Received: from fllv0015.ext.ti.com (fllv0015.ext.ti.com [198.47.19.141]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CFC4367FD; Thu, 23 Mar 2023 05:01:17 -0700 (PDT) Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 32NC194a099471; Thu, 23 Mar 2023 07:01:09 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1679572869; bh=FUB77A/dWJI4L/JUMtJNi/1d+ynfoPHVkgEDX79znkw=; h=From:To:CC:Subject:Date; b=VkLsNCAaPmIREYLqqYsHFh5loOponyT0rPjHoZH5/fnllcoBGlX+hyqOKhjh+YiqT 8zMRXcL6jRiSgfHtLfIIjkeppeQMXUHDJXyqogRKPLN/LMOb+YuYTYhAYLhn+yKkgY RR6cpgs5XADvLQavOO2qeWAgpo2HPyBCW9sHNkm4= Received: from DLEE108.ent.ti.com (dlee108.ent.ti.com [157.170.170.38]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 32NC19Le025154 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 23 Mar 2023 07:01:09 -0500 Received: from DLEE115.ent.ti.com (157.170.170.26) by DLEE108.ent.ti.com (157.170.170.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16; Thu, 23 Mar 2023 07:01:08 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE115.ent.ti.com (157.170.170.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16 via Frontend Transport; Thu, 23 Mar 2023 07:01:08 -0500 Received: from localhost (ileaxei01-snat.itg.ti.com [10.180.69.5]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 32NC17gh021970; Thu, 23 Mar 2023 07:01:08 -0500 From: Jayesh Choudhary To: , CC: , , , Subject: [PATCH v2] dmaengine: ti: k3-udma: Workaround errata i2234 Date: Thu, 23 Mar 2023 17:31:07 +0530 Message-ID: <20230323120107.27638-1-j-choudhary@ti.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Vignesh Raghavendra 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 [j-choudhary@ti.com: minor cleanups] Signed-off-by: Jayesh Choudhary --- Changelog v1->v2: - Correct the commit subject - Update functions that uses only tr_type15_t, and not tr_type_1_t as PDMAs and CSI uses tr_type_1_t (to address Peter's comment in v1) v1 patch link: drivers/dma/ti/k3-udma.c | 20 +++++++++++--------- include/linux/dma/ti-cppi5.h | 1 + 2 files changed, 12 insertions(+), 9 deletions(-) diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c index 7e23a6fdef95..e33a7fec2c0f 100644 --- a/drivers/dma/ti/k3-udma.c +++ b/drivers/dma/ti/k3-udma.c @@ -2964,6 +2964,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc,= struct scatterlist *sgl, struct scatterlist *sgent; struct cppi5_tr_type15_t *tr_req =3D NULL; enum dma_slave_buswidth dev_width; + u32 csf =3D CPPI5_TR_CSF_SUPR_EVT; u16 tr_cnt0, tr_cnt1; dma_addr_t dev_addr; struct udma_desc *d; @@ -3034,6 +3035,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc,= struct scatterlist *sgl, =20 if (uc->ud->match_data->type =3D=3D DMA_TYPE_UDMA) { asel =3D 0; + csf |=3D CPPI5_TR_CSF_EOL_ICNT0; } else { asel =3D (u64)uc->config.asel << K3_ADDRESS_ASEL_SHIFT; dev_addr |=3D asel; @@ -3057,7 +3059,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc,= struct scatterlist *sgl, =20 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); @@ -3103,8 +3105,7 @@ 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, @@ -3148,8 +3149,7 @@ udma_prep_slave_sg_triggered_tr(struct udma_chan *uc,= struct scatterlist *sgl, d->residue +=3D sg_len; } =20 - 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); =20 return d; } @@ -3678,6 +3678,7 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_= t dest, dma_addr_t src, int num_tr; size_t tr_size =3D sizeof(struct cppi5_tr_type15_t); u16 tr0_cnt0, tr0_cnt1, tr1_cnt0; + u32 csf =3D CPPI5_TR_CSF_SUPR_EVT; =20 if (uc->config.dir !=3D DMA_MEM_TO_MEM) { dev_err(chan->device->dev, @@ -3708,13 +3709,15 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_add= r_t dest, dma_addr_t src, if (uc->ud->match_data->type !=3D DMA_TYPE_UDMA) { src |=3D (u64)uc->ud->asel << K3_ADDRESS_ASEL_SHIFT; dest |=3D (u64)uc->ud->asel << K3_ADDRESS_ASEL_SHIFT; + } else { + csf |=3D CPPI5_TR_CSF_EOL_ICNT0; } =20 tr_req =3D d->hwdesc[0].tr_req_base; =20 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); =20 tr_req[0].addr =3D src; tr_req[0].icnt0 =3D tr0_cnt0; @@ -3733,7 +3736,7 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_= t dest, dma_addr_t src, if (num_tr =3D=3D 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); =20 tr_req[1].addr =3D src + tr0_cnt1 * tr0_cnt0; tr_req[1].icnt0 =3D tr1_cnt0; @@ -3748,8 +3751,7 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_= t dest, dma_addr_t src, tr_req[1].dicnt3 =3D 1; } =20 - 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); =20 if (uc->config.metadata_size) d->vd.tx.metadata_ops =3D &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) =20 /** --=20 2.25.1