lkml.org 
[lkml]   [2019]   [Dec]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset
On 20-12-19, 08:49, cang@codeaurora.org wrote:
> On 2019-12-20 08:22, cang@codeaurora.org wrote:
> > On 2019-12-19 23:04, Vinod Koul wrote:
> > > For V4 QMP UFS Phy, we need to assert reset bits, configure the phy
> > > and
> > > then deassert it, so add optional has_sw_reset flag and use that to
> > > configure the QPHY_SW_RESET register.
> > >
> > > Signed-off-by: Vinod Koul <vkoul@kernel.org>
> > > ---
> > > drivers/phy/qualcomm/phy-qcom-qmp.c | 10 ++++++++++
> > > 1 file changed, 10 insertions(+)
> > >
> > > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c
> > > b/drivers/phy/qualcomm/phy-qcom-qmp.c
> > > index 06f971ca518e..80304b7cd895 100644
> > > --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> > > +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> > > @@ -1023,6 +1023,9 @@ struct qmp_phy_cfg {
> > >
> > > /* true, if PCS block has no separate SW_RESET register */
> > > bool no_pcs_sw_reset;
> > > +
> > > + /* true if sw reset needs to be invoked */
> > > + bool has_sw_reset;
> > > };
> > >
> > > /**
> > > @@ -1391,6 +1394,7 @@ static const struct qmp_phy_cfg
> > > sm8150_ufsphy_cfg = {
> > >
> > > .is_dual_lane_phy = true,
> > > .no_pcs_sw_reset = true,
> > > + .has_sw_reset = true,
> > > };
> > >
> > > static void qcom_qmp_phy_configure(void __iomem *base,
> > > @@ -1475,6 +1479,9 @@ static int qcom_qmp_phy_com_init(struct
> > > qmp_phy *qphy)
> > > SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
> > > }
> > >
> > > + if (cfg->has_sw_reset)
> > > + qphy_setbits(serdes, cfg->regs[QPHY_SW_RESET], SW_RESET);
> > > +
> >
> > Are you sure you want to set this in the serdes register? QPHY_SW_RESET
> > is in its pcs register.
> >
> > > if (cfg->has_phy_com_ctrl)
> > > qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
> > > SW_PWRDN);
> > > @@ -1651,6 +1658,9 @@ static int qcom_qmp_phy_enable(struct phy *phy)
> > > if (cfg->has_phy_dp_com_ctrl)
> > > qphy_clrbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
> > >
> > > + if (cfg->has_sw_reset)
> > > + qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
> > > +
> >
> > Yet you are clearing it from pcs register.

updated now, will send v2

> >
> > Regards,
> > Can Guo
> >
> > > /* start SerDes and Phy-Coding-Sublayer */
> > > qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
>
> I thought your change would be like this
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c
> b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 8e642a6..a4ab4b7 100755
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -166,6 +166,7 @@ static const unsigned int sdm845_ufsphy_regs_layout[] =
> {
> };
>
> static const unsigned int sm8150_ufsphy_regs_layout[] = {
> + [QPHY_SW_RESET] = 0x08,
> [QPHY_START_CTRL] = 0x00,
> [QPHY_PCS_READY_STATUS] = 0x180,
> };
> @@ -1390,7 +1391,6 @@ static const struct qmp_phy_cfg sm8150_ufsphy_cfg = {
> .pwrdn_ctrl = SW_PWRDN,
>
> .is_dual_lane_phy = true,
> - .no_pcs_sw_reset = true,
> };
>
> static void qcom_qmp_phy_configure(void __iomem *base,
> @@ -1475,6 +1475,9 @@ static int qcom_qmp_phy_com_init(struct qmp_phy *qphy)
> SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
> }
>
> + if ((cfg->type == PHY_TYPE_UFS) && (!cfg->no_pcs_sw_reset))
> + qphy_setbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);

Well am not sure if no_pcs_sw_reset would do this and side effect on
other phys (somehow older ones dont seem to need this). That was the
reason for a new flag and to be used for specific instances

Thanks
--
~Vinod

\
 
 \ /
  Last update: 2019-12-20 05:25    [W:0.126 / U:0.552 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site