[PATCH 1/6] ufs: Add UFSHCD_QUIRK_BROKEN_64BIT_ADDRESS

[Bhupesh Sharma]

On Wed, 16 Aug 2023 at 02:31, Marek Vasut <marek.vasut at mailbox.org> wrote:
>
> On 8/15/23 22:04, Bhupesh Sharma wrote:
> > Hi Marek,
> >
> > On 8/14/23 5:22 AM, Marek Vasut wrote:
> >> Add UFSHCD_QUIRK_BROKEN_64BIT_ADDRESS for host controllers which do not
> >> support 64-bit addressing.
> >>
> >> Ported from Linux kernel commit
> >> 6554400d6f66 ("scsi: ufs: core: Add UFSHCD_QUIRK_BROKEN_64BIT_ADDRESS")
> >> with ufs_scsi_buffer_aligned() based on U-Boot generic bounce buffer.
> >>
> >> Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
> >> ---
> >> Cc: Faiz Abbas <faiz_abbas at ti.com>
> >> ---
> >>   drivers/ufs/ufs.c | 26 ++++++++++++++++++++++++++
> >>   drivers/ufs/ufs.h |  6 ++++++
> >>   2 files changed, 32 insertions(+)
> >>
> >> diff --git a/drivers/ufs/ufs.c b/drivers/ufs/ufs.c
> >> index 3bf1a95e7f2..da0550d98c6 100644
> >> --- a/drivers/ufs/ufs.c
> >> +++ b/drivers/ufs/ufs.c
> >> @@ -8,6 +8,7 @@
> >>    * Copyright (C) 2019 Texas Instruments Incorporated -
> >> http://www.ti.com
> >>    */
> >> +#include <bouncebuf.h>
> >>   #include <charset.h>
> >>   #include <common.h>
> >>   #include <dm.h>
> >> @@ -1889,6 +1890,8 @@ int ufshcd_probe(struct udevice *ufs_dev, struct
> >> ufs_hba_ops *hba_ops)
> >>       /* Read capabilties registers */
> >>       hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);
> >> +    if (hba->quirks & UFSHCD_QUIRK_BROKEN_64BIT_ADDRESS)
> >> +        hba->capabilities &= ~MASK_64_ADDRESSING_SUPPORT;
> >>       /* Get UFS version supported by the controller */
> >>       hba->version = ufshcd_get_ufs_version(hba);
> >> @@ -1942,8 +1945,31 @@ int ufs_scsi_bind(struct udevice *ufs_dev,
> >> struct udevice **scsi_devp)
> >>       return ret;
> >>   }
> >> +#if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
> >> +static int ufs_scsi_buffer_aligned(struct udevice *scsi_dev, struct
> >> bounce_buffer *state)
> >> +{
> >> +#ifdef CONFIG_PHYS_64BIT
> >> +    struct ufs_hba *hba = dev_get_uclass_priv(scsi_dev->parent);
> >> +    uintptr_t ubuf = (uintptr_t)state->user_buffer;
> >> +    size_t len = state->len_aligned;
> >> +
> >> +    /* Check if below 32bit boundary */
> >> +    if ((hba->quirks & UFSHCD_QUIRK_BROKEN_64BIT_ADDRESS) &&
> >> +        ((ubuf >> 32) || (ubuf + len) >> 32)) {
> >> +        dev_dbg(scsi_dev, "Buffer above 32bit boundary %lx-%lx\n",
> >> +            ubuf, ubuf + len);
> >> +        return 0;
> >> +    }
> >> +#endif
> >> +    return 1;
> >> +}
> >> +#endif    /* CONFIG_BOUNCE_BUFFER */
> >> +
> >>   static struct scsi_ops ufs_ops = {
> >>       .exec        = ufs_scsi_exec,
> >> +#if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
> >> +    .buffer_aligned    = ufs_scsi_buffer_aligned,
> >> +#endif    /* CONFIG_BOUNCE_BUFFER */
> >>   };
> >>   int ufs_probe_dev(int index)
> >> diff --git a/drivers/ufs/ufs.h b/drivers/ufs/ufs.h
> >> index 8a38832b05f..070db0dce68 100644
> >> --- a/drivers/ufs/ufs.h
> >> +++ b/drivers/ufs/ufs.h
> >> @@ -719,6 +719,12 @@ struct ufs_hba {
> >>    */
> >>   #define UFSHCD_QUIRK_BROKEN_LCC                0x1
> >> +/*
> >> + * This quirk needs to be enabled if the host controller has
> >> + * 64-bit addressing supported capability but it doesn't work.
> >> + */
> >> +#define UFSHCD_QUIRK_BROKEN_64BIT_ADDRESS        0x2
> >> +
> >>       /* Virtual memory reference */
> >>       struct utp_transfer_cmd_desc *ucdl;
> >>       struct utp_transfer_req_desc *utrdl;
> >
> > For this and the follow-up patch, I think implementing or at least
> > supporting all the quirks currently supported by the Linux UFS driver
> > makes sense as newer controllers do support these quirks.
>
> I disagree. There is no point in implementing quirks which cannot be
> tested or may not even be relevant to U-Boot. Quirks which are needed
> should be added one by one.

But the format you use for adding new quiks in u-boot is still in sync
with Linux version 3.10. Can we atleast use the newer ( 1<< 7) kind of
format for consistency.

Thanks.

> > Accordingly I had sent:
> > https://lists.denx.de/pipermail/u-boot/2023-August/527217.html
> >
> > So, I would suggest that we pick these two patches and then I can send
> > my patches rebased on the same, but change the .h to support all the
> > possible UFS quirks currently supported in Linux so that subsequent
> > patches can utilize them in u-boot - which I plan to post next.
>
> See above.