From: "Alim Akhtar" <alim.akhtar@samsung.com>
To: "'Eric Biggers'" <ebiggers@kernel.org>
Cc: <robh@kernel.org>, <devicetree@vger.kernel.org>,
<linux-scsi@vger.kernel.org>, <krzk@kernel.org>,
<avri.altman@wdc.com>, <martin.petersen@oracle.com>,
<kwmad.kim@samsung.com>, <stanley.chu@mediatek.com>,
<cang@codeaurora.org>, <linux-samsung-soc@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <kishon@ti.com>
Subject: RE: [RESEND PATCH v10 04/10] scsi: ufs: introduce UFSHCD_QUIRK_PRDT_BYTE_GRAN quirk
Date: Thu, 13 Aug 2020 06:51:13 +0530 [thread overview]
Message-ID: <000401d67110$0be2d9c0$23a88d40$@samsung.com> (raw)
In-Reply-To: <20200812002920.GA1352011@gmail.com>
Hi Eric,
> -----Original Message-----
> From: Eric Biggers <ebiggers@kernel.org>
> Sent: 12 August 2020 05:59
> To: Alim Akhtar <alim.akhtar@samsung.com>
> Cc: robh@kernel.org; devicetree@vger.kernel.org;
linux-scsi@vger.kernel.org;
> krzk@kernel.org; avri.altman@wdc.com; martin.petersen@oracle.com;
> kwmad.kim@samsung.com; stanley.chu@mediatek.com;
> cang@codeaurora.org; linux-samsung-soc@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; linux-kernel@vger.kernel.org; kishon@ti.com
> Subject: Re: [RESEND PATCH v10 04/10] scsi: ufs: introduce
> UFSHCD_QUIRK_PRDT_BYTE_GRAN quirk
>
> Hi Alim,
>
> On Sat, Jun 13, 2020 at 08:17:00AM +0530, Alim Akhtar wrote:
> > Some UFS host controllers like Exynos uses granularities of PRDT
> > length and offset as bytes, whereas others uses actual segment count.
> >
> > Reviewed-by: Avri Altman <avri.altman@wdc.com>
> > Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
> > Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
> > ---
> > drivers/scsi/ufs/ufshcd.c | 30 +++++++++++++++++++++++-------
> > drivers/scsi/ufs/ufshcd.h | 6 ++++++
> > 2 files changed, 29 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> > index ee30ed6cc805..ba093d0d0942 100644
> > --- a/drivers/scsi/ufs/ufshcd.c
> > +++ b/drivers/scsi/ufs/ufshcd.c
> > @@ -2151,8 +2151,14 @@ static int ufshcd_map_sg(struct ufs_hba *hba,
> struct ufshcd_lrb *lrbp)
> > return sg_segments;
> >
> > if (sg_segments) {
> > - lrbp->utr_descriptor_ptr->prd_table_length =
> > - cpu_to_le16((u16)sg_segments);
> > +
> > + if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
> > + lrbp->utr_descriptor_ptr->prd_table_length =
> > + cpu_to_le16((sg_segments *
> > + sizeof(struct ufshcd_sg_entry)));
> > + else
> > + lrbp->utr_descriptor_ptr->prd_table_length =
> > + cpu_to_le16((u16) (sg_segments));
> >
> > prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;
> >
> > @@ -3500,11 +3506,21 @@ static void
> ufshcd_host_memory_configure(struct ufs_hba *hba)
> >
> cpu_to_le32(upper_32_bits(cmd_desc_element_addr));
> >
> > /* Response upiu and prdt offset should be in double words
*/
> > - utrdlp[i].response_upiu_offset =
> > - cpu_to_le16(response_offset >> 2);
> > - utrdlp[i].prd_table_offset = cpu_to_le16(prdt_offset >> 2);
> > - utrdlp[i].response_upiu_length =
> > - cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> > + if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN) {
> > + utrdlp[i].response_upiu_offset =
> > + cpu_to_le16(response_offset);
> > + utrdlp[i].prd_table_offset =
> > + cpu_to_le16(prdt_offset);
> > + utrdlp[i].response_upiu_length =
> > + cpu_to_le16(ALIGNED_UPIU_SIZE);
> > + } else {
> > + utrdlp[i].response_upiu_offset =
> > + cpu_to_le16(response_offset >> 2);
> > + utrdlp[i].prd_table_offset =
> > + cpu_to_le16(prdt_offset >> 2);
> > + utrdlp[i].response_upiu_length =
> > + cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> > + }
> >
> > ufshcd_init_lrb(hba, &hba->lrb[i], i);
> > }
>
> Isn't this patch missing an update to ufshcd_print_trs()? It uses
> ->prd_table_length as the number of segments, not the number of bytes.
>
prd_table_length will be populated before it reaches ufshcd_print_trs()
based on UFSHCD_QUIRK_PRDT_BYTE_GRAN.
> - Eric
next prev parent reply other threads:[~2020-08-13 1:21 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200613030436epcas5p38137bcaddd80ec5eed746a80a1fe31f5@epcas5p3.samsung.com>
2020-06-13 2:46 ` [RESEND PATCH v10 00/10] exynos-ufs: Add support for UFS HCI Alim Akhtar
[not found] ` <CGME20200613030438epcas5p337ed074612a2a1e8b4d6ecb3dda30b5c@epcas5p3.samsung.com>
2020-06-13 2:46 ` [RESEND PATCH v10 01/10] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr Alim Akhtar
[not found] ` <CGME20200613030440epcas5p121247d520b30ddca1a31b2d57bfc6b91@epcas5p1.samsung.com>
2020-06-13 2:46 ` [RESEND PATCH v10 02/10] scsi: ufs: add quirk to disallow reset of interrupt aggregation Alim Akhtar
[not found] ` <CGME20200613030443epcas5p3596ed8c2f56f3aa6bee7d72cb104363a@epcas5p3.samsung.com>
2020-06-13 2:46 ` [RESEND PATCH v10 03/10] scsi: ufs: add quirk to enable host controller without hce Alim Akhtar
[not found] ` <CGME20200613030445epcas5p4428da322cd9527d1075ff0f1ccc75d23@epcas5p4.samsung.com>
2020-06-13 2:47 ` [RESEND PATCH v10 04/10] scsi: ufs: introduce UFSHCD_QUIRK_PRDT_BYTE_GRAN quirk Alim Akhtar
2020-08-12 0:29 ` Eric Biggers
2020-08-13 1:21 ` Alim Akhtar [this message]
2020-08-13 1:25 ` Eric Biggers
[not found] ` <CGME20200613030447epcas5p4ef2db2121851bdd251d2fd19b3532bb1@epcas5p4.samsung.com>
2020-06-13 2:47 ` [RESEND PATCH v10 05/10] scsi: ufs: add quirk to fix abnormal ocs fatal error Alim Akhtar
[not found] ` <CGME20200613030449epcas5p3cb1139c47ed1c9055c22facf2f5a933b@epcas5p3.samsung.com>
2020-06-13 2:47 ` [RESEND PATCH v10 06/10] dt-bindings: phy: Document Samsung UFS PHY bindings Alim Akhtar
[not found] ` <CGME20200613030451epcas5p101ab5aa635668f68b88f302c25b32a6d@epcas5p1.samsung.com>
2020-06-13 2:47 ` [RESEND PATCH v10 07/10] phy: samsung-ufs: add UFS PHY driver for samsung SoC Alim Akhtar
[not found] ` <CGME20200613030454epcas5p400f76485ddb34ce6293f0c8fa94332b8@epcas5p4.samsung.com>
2020-06-13 2:47 ` [RESEND PATCH v10 08/10] dt-bindings: ufs: Add bindings for Samsung ufs host Alim Akhtar
2021-07-13 7:05 ` Alim Akhtar
2021-07-13 12:45 ` Krzysztof Kozlowski
2021-07-13 23:34 ` Chanho Park
2021-07-19 2:07 ` Martin K. Petersen
2021-07-19 3:02 ` Chanho Park
[not found] ` <CGME20200613030456epcas5p2e8c8518fbff9bac830c2a5ffec6109d7@epcas5p2.samsung.com>
2020-06-13 2:47 ` [RESEND PATCH v10 09/10] scsi: ufs-exynos: add UFS host support for Exynos SoCs Alim Akhtar
[not found] ` <CGME20200613030458epcas5p3f9667bab202d99fb332d5bf5aad63c85@epcas5p3.samsung.com>
2020-06-13 2:47 ` [RESEND PATCH v10 10/10] arm64: dts: Add node for ufs exynos7 Alim Akhtar
2020-06-14 11:02 ` Krzysztof Kozlowski
2020-06-15 16:15 ` Alim Akhtar
2020-06-16 3:59 ` [RESEND PATCH v10 00/10] exynos-ufs: Add support for UFS HCI Martin K. Petersen
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