LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Subhash Jadavani <subhashj@codeaurora.org>
To: Alim Akhtar <alim.akhtar@samsung.com>
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
	jejb@linux.vnet.ibm.com, martin.petersen@oracle.com,
	vivek.gautam@codeaurora.org, vinholikatti@gmail.com,
	olof@lixom.net, linux-scsi-owner@vger.kernel.org
Subject: Re: [PATCH 1/4] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr
Date: Wed, 16 May 2018 14:23:46 -0700	[thread overview]
Message-ID: <11cab20b216b6b84983780466f401549@codeaurora.org> (raw)
In-Reply-To: <1525601658-31989-2-git-send-email-alim.akhtar@samsung.com>

On 2018-05-06 03:14, Alim Akhtar wrote:
> In the right behavior, setting the bit to '0' indicates clear and
> '1' indicates no change. If host controller handles this the other way,
> UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR can be used.
> 
> Signed-off-by: Seungwon Jeon <essuuj@gmail.com>
> Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
> ---
>  drivers/scsi/ufs/ufshcd.c | 21 +++++++++++++++++++--
>  drivers/scsi/ufs/ufshcd.h |  5 +++++
>  2 files changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 00e7905..9898ce5 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -675,7 +675,24 @@ static inline void ufshcd_put_tm_slot(struct
> ufs_hba *hba, int slot)
>   */
>  static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
>  {
> -	ufshcd_writel(hba, ~(1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
> +	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
> +		ufshcd_writel(hba, (1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
> +	else
> +		ufshcd_writel(hba, ~(1 << pos),
> +				REG_UTP_TRANSFER_REQ_LIST_CLEAR);
> +}
> +
> +/**
> + * ufshcd_utmrl_clear - Clear a bit in UTRMLCLR register
> + * @hba: per adapter instance
> + * @pos: position of the bit to be cleared
> + */
> +static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
> +{
> +	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
> +		ufshcd_writel(hba, (1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
> +	else
> +		ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
>  }
> 
>  /**
> @@ -5398,7 +5415,7 @@ static int ufshcd_clear_tm_cmd(struct ufs_hba
> *hba, int tag)
>  		goto out;
> 
>  	spin_lock_irqsave(hba->host->host_lock, flags);
> -	ufshcd_writel(hba, ~(1 << tag), REG_UTP_TASK_REQ_LIST_CLEAR);
> +	ufshcd_utmrl_clear(hba, tag);
>  	spin_unlock_irqrestore(hba->host->host_lock, flags);
> 
>  	/* poll for max. 1 sec to clear door bell register by h/w */
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 8110dcd..43035f8 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -595,6 +595,11 @@ struct ufs_hba {
>  	 */
>  	#define UFSHCD_QUIRK_PRDT_BYTE_GRAN			0x80
> 
> +	/*
> +	 * Cleaer handling for transfer/task request list is just opposite.
> +	 */
> +	#define UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR		0x100
> +
>  	unsigned int quirks;	/* Deviations from standard UFSHCI spec. */
> 
>  	/* Device deviations from standard UFS device spec. */

Looks good to me.
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>

-- 
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

  reply	other threads:[~2018-05-16 21:23 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20180506102636epcas2p3432b71e5c867f6cfec16cf2a8c74b0e2@epcas2p3.samsung.com>
2018-05-06 10:14 ` [PATCH 0/4] Add required changes to ufshcd to support exynos ufs hci Alim Akhtar
     [not found]   ` <CGME20180506102638epcas1p17bea76e1a5dbac535d5d6a10181f7e29@epcas1p1.samsung.com>
2018-05-06 10:14     ` [PATCH 1/4] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr Alim Akhtar
2018-05-16 21:23       ` Subhash Jadavani [this message]
2018-05-17  4:06       ` Asutosh Das (asd)
     [not found]   ` <CGME20180506102639epcas2p13ac44966a64e539f611ccdc2479e1abb@epcas2p1.samsung.com>
2018-05-06 10:14     ` [PATCH 2/4] scsi: ufs: add quirk not to allow reset of interrupt aggregation Alim Akhtar
2018-05-16 21:24       ` Subhash Jadavani
     [not found]   ` <CGME20180506102641epcas1p40fb2055e82d32d7cfa594af132273d31@epcas1p4.samsung.com>
2018-05-06 10:14     ` [PATCH 3/4] scsi: ufs: add quirk to enable host controller without hce Alim Akhtar
2018-05-16 21:26       ` Subhash Jadavani
     [not found]   ` <CGME20180506102643epcas2p24ed80d7ede859db73c2595724d9c2414@epcas2p2.samsung.com>
2018-05-06 10:14     ` [PATCH 4/4] scsi: ufs: make ufshcd_config_pwr_mode of non-static func Alim Akhtar
2018-05-16  7:51       ` Avri Altman
2018-05-16 21:27       ` Subhash Jadavani
2018-05-16  4:30   ` [PATCH 0/4] Add required changes to ufshcd to support exynos ufs hci Alim Akhtar
2018-05-18 14:52   ` Martin K. Petersen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=11cab20b216b6b84983780466f401549@codeaurora.org \
    --to=subhashj@codeaurora.org \
    --cc=alim.akhtar@samsung.com \
    --cc=jejb@linux.vnet.ibm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-scsi-owner@vger.kernel.org \
    --cc=linux-scsi@vger.kernel.org \
    --cc=martin.petersen@oracle.com \
    --cc=olof@lixom.net \
    --cc=vinholikatti@gmail.com \
    --cc=vivek.gautam@codeaurora.org \
    --subject='Re: [PATCH 1/4] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).