RE: [PATCH 13/15] scsi: ufs: ufs-exynos: support exynosauto v9 ufs driver

["Alim Akhtar" <alim.akhtar@samsung.com>]

> -----Original Message-----
> From: Krzysztof Kozlowski <krzk@kernel.org>
> Sent: 13 July 2021 16:28
> To: Chanho Park <chanho61.park@samsung.com>
> Cc: Alim Akhtar <alim.akhtar@samsung.com>; James E . J . Bottomley
> <jejb@linux.ibm.com>; Martin K . Petersen <martin.petersen@oracle.com>;
> Can Guo <cang@codeaurora.org>; Jaegeuk Kim <jaegeuk@kernel.org>;
> Kiwoong Kim <kwmad.kim@samsung.com>; Avri Altman
> <avri.altman@wdc.com>; Adrian Hunter <adrian.hunter@intel.com>;
> Christoph Hellwig <hch@infradead.org>; Bart Van Assche
> <bvanassche@acm.org>; jongmin jeong <jjmin.jeong@samsung.com>;
> Gyunghoon Kwon <goodjob.kwon@samsung.com>; linux-samsung-
> soc@vger.kernel.org; linux-scsi@vger.kernel.org
> Subject: Re: [PATCH 13/15] scsi: ufs: ufs-exynos: support exynosauto v9 ufs
> driver
> 
> -On Fri, 9 Jul 2021 at 08:59, Chanho Park <chanho61.park@samsung.com>
> wrote:
> >
> > This patch adds to support ufs variant for ExynosAuto v9 SoC. This
> > requires control UFS IP sharability register via syscon and regmap.
> > Regarding uic_attr, most of values can be shared with exynos7 except
> > tx_dif_p_nsec value.
> >
> > Signed-off-by: Chanho Park <chanho61.park@samsung.com>
> > ---
> >  drivers/scsi/ufs/ufs-exynos.c | 97
> > +++++++++++++++++++++++++++++++++++
> >  1 file changed, 97 insertions(+)
> >
> > diff --git a/drivers/scsi/ufs/ufs-exynos.c
> > b/drivers/scsi/ufs/ufs-exynos.c index 9669afe8f1f4..82f915f7a447
> > 100644
> > --- a/drivers/scsi/ufs/ufs-exynos.c
> > +++ b/drivers/scsi/ufs/ufs-exynos.c
> > @@ -15,6 +15,7 @@
> >  #include <linux/mfd/syscon.h>
> >  #include <linux/phy/phy.h>
> >  #include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> >
> >  #include "ufshcd.h"
> >  #include "ufshcd-pltfrm.h"
> > @@ -76,6 +77,12 @@
> >                                  UIC_TRANSPORT_NO_CONNECTION_RX |\
> >                                  UIC_TRANSPORT_BAD_TC)
> >
> > +/* FSYS UFS Sharability */
> 
> Sharability -> Shareability
> 
> > +#define UFS_WR_SHARABLE                BIT(2)
> > +#define UFS_RD_SHARABLE                BIT(1)
> > +#define UFS_SHARABLE           (UFS_WR_SHARABLE | UFS_RD_SHARABLE)
> > +#define UFS_SHARABILITY_OFFSET 0x710
> > +
> >  enum {
> >         UNIPRO_L1_5 = 0,/* PHY Adapter */
> >         UNIPRO_L2,      /* Data Link */
> > @@ -151,6 +158,80 @@ static int exynos7_ufs_drv_init(struct device *dev,
> struct exynos_ufs *ufs)
> >         return 0;
> >  }
> >
> > +static int exynosauto_ufs_drv_init(struct device *dev, struct
> > +exynos_ufs *ufs) {
> > +       struct exynos_ufs_uic_attr *attr = ufs->drv_data->uic_attr;
> > +
> > +       /* IO Coherency setting */
> > +       if (ufs->sysreg) {
> > +               return regmap_update_bits(ufs->sysreg,
> UFS_SHARABILITY_OFFSET,
> > +                                         UFS_SHARABLE, UFS_SHARABLE);
> > +       }
> > +
> > +       attr->tx_dif_p_nsec = 3200000;
> > +
> > +       return 0;
> > +}
> > +
> > +static int exynosauto_ufs_pre_link(struct exynos_ufs *ufs) {
> > +       struct ufs_hba *hba = ufs->hba;
> > +       int i;
> > +
> > +       ufshcd_dme_set(hba, UIC_ARG_MIB(0x200), 0x40);
> > +       for_each_ufs_rx_lane(ufs, i) {
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x12, i),
> > +                              DIV_ROUND_UP(NSEC_PER_SEC, ufs->mclk_rate));
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x11, i), 0x0);
> > +
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x1b, i), 0x2);
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x1c, i), 0x8a);
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x1d, i), 0xa3);
> > +
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x1b, i), 0x2);
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x1c, i), 0x8a);
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x1d, i), 0xa3);
> > +
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x2f, i), 0x79);
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x84, i), 0x1);
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x25, i), 0xf6);
> > +       }
> > +
> > +       for_each_ufs_tx_lane(ufs, i) {
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0xaa, i),
> > +                              DIV_ROUND_UP(NSEC_PER_SEC, ufs->mclk_rate));
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0xa9, i), 0x02);
> > +
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0xab, i), 0x8);
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0xac, i), 0x22);
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0xad, i), 0x8);
> > +
> > +               ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(0x04, i), 0x1);
> > +       }
> > +
> > +       ufshcd_dme_set(hba, UIC_ARG_MIB(0x200), 0x0);
> > +
> > +       ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
> 0x0);
> > +
> > +       ufshcd_dme_set(hba, UIC_ARG_MIB(0xa011), 0x8000);
> > +
> > +       return 0;
> > +}
> > +
> > +static int exynosauto_ufs_pre_pwr_change(struct exynos_ufs *ufs,
> > +                                        struct ufs_pa_layer_attr
> > +*pwr) {
> > +       struct ufs_hba *hba = ufs->hba;
> > +
> > +       /* PACP_PWR_req and delivered to the remote DME */
> > +       ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA0),
> 12000);
> > +       ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA1),
> 32000);
> > +       ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA2),
> 16000);
> > +
> > +       return 0;
> > +}
> > +
> 
> No need for double line.
> 
> > +
> >  static int exynos7_ufs_pre_link(struct exynos_ufs *ufs)  {
> >         struct ufs_hba *hba = ufs->hba; @@ -1305,6 +1386,20 @@ static
> > struct exynos_ufs_uic_attr exynos7_uic_attr = {
> >         .pa_dbg_option_suite            = 0x30103,
> >  };
> >
> > +static struct exynos_ufs_drv_data exynosauto_ufs_drvs = {
> > +       .uic_attr               = &exynos7_uic_attr,
> > +       .quirks                 = UFSHCD_QUIRK_PRDT_BYTE_GRAN |
> > +                                 UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR |
> > +                                 UFSHCD_QUIRK_BROKEN_OCS_FATAL_ERROR |
> > +                                 UFSHCD_QUIRK_SKIP_DEF_UNIPRO_TIMEOUT_SETTING,
> > +       .opts                   = EXYNOS_UFS_OPT_BROKEN_AUTO_CLK_CTRL |
> > +                                 EXYNOS_UFS_OPT_SKIP_CONFIG_PHY_ATTR |
> > +                                 EXYNOS_UFS_OPT_BROKEN_RX_SEL_IDX,
> > +       .drv_init               = exynosauto_ufs_drv_init,
> > +       .pre_link               = exynosauto_ufs_pre_link,
> > +       .pre_pwr_change         = exynosauto_ufs_pre_pwr_change,
> > +};
> > +
> >  static struct exynos_ufs_drv_data exynos_ufs_drvs = {
> >         .uic_attr               = &exynos7_uic_attr,
> >         .quirks                 = UFSHCD_QUIRK_PRDT_BYTE_GRAN |
> > @@ -1330,6 +1425,8 @@ static struct exynos_ufs_drv_data
> > exynos_ufs_drvs = {  static const struct of_device_id
> exynos_ufs_of_match[] = {
> >         { .compatible = "samsung,exynos7-ufs",
> >           .data       = &exynos_ufs_drvs },
> > +       { .compatible = "samsung,exynosautov9-ufs",
> > +         .data       = &exynosauto_ufs_drvs },
> 
> This compatible is not documented. It seems that no one document
> exynos7-ufs but that's not an excuse. :)
> 
I was post along with UFS driver [1], had Rob's Reviewed-by as well, not sure why it is not merged. 
Let me ping Rob on this.
[1] https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2176074.html

> Best regards,
> Krzysztof