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Date: Tue, 6 Sep 2022 11:49:47 +0200
From: Markus Schneider-Pargmann <msp@...libre.com>
To: Matthias Brugger <matthias.bgg@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Chun-Jie Chen <chun-jie.chen@...iatek.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Fabien Parent <parent.f@...il.com>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
Alexandre Bailon <abailon@...libre.com>,
Fabien Parent <fparent@...libre.com>
Subject: Re: [PATCH v3 2/4] soc: mediatek: Add support of WAY_EN operations
Hi Matthias,
On Mon, Aug 22, 2022 at 06:17:58PM +0200, Matthias Brugger wrote:
>
>
> On 22/08/2022 16:43, Markus Schneider-Pargmann wrote:
> > From: Alexandre Bailon <abailon@...libre.com>
> >
> > This updates the power domain to support WAY_EN operations. These
> > operations enable a path between different units of the chip and are
> > labeled as 'way_en' in the register descriptions.
> >
> > This operation is required by the mt8365 for the MM power domain.
> >
> > Signed-off-by: Alexandre Bailon <abailon@...libre.com>
> > Signed-off-by: Fabien Parent <fparent@...libre.com>
> > Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> > ---
> >
> > Notes:
> > Changes in v3:
> > - Separated the way_en functions for clarity
> > - Added some checks for infracfg_nao
> > Changes in v2:
> > - some minor style fixes.
> > - Renamed 'wayen' to 'way_en' to clarify the meaning
> > - Updated commit message
> >
> > drivers/soc/mediatek/mtk-pm-domains.c | 162 +++++++++++++++++++++-----
> > drivers/soc/mediatek/mtk-pm-domains.h | 28 +++--
> > 2 files changed, 149 insertions(+), 41 deletions(-)
> >
> > diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> > index 9734f1091c69..c2cbe0de6aa1 100644
> > --- a/drivers/soc/mediatek/mtk-pm-domains.c
> > +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> > @@ -43,6 +43,7 @@ struct scpsys_domain {
> > struct clk_bulk_data *clks;
> > int num_subsys_clks;
> > struct clk_bulk_data *subsys_clks;
> > + struct regmap *infracfg_nao;
> > struct regmap *infracfg;
> > struct regmap *smi;
> > struct regulator *supply;
> > @@ -117,26 +118,61 @@ static int scpsys_sram_disable(struct scpsys_domain *pd)
> > MTK_POLL_TIMEOUT);
> > }
> > -static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, struct regmap *regmap)
> > +static int __scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd,
> > + struct regmap *regmap)
> > +{
> > + u32 val;
> > + u32 mask = bpd->bus_prot_mask;
> > + u32 sta_mask = bpd->bus_prot_sta_mask;
> > +
> > + if (bpd->bus_prot_reg_update)
> > + regmap_set_bits(regmap, bpd->bus_prot_set, mask);
> > + else
> > + regmap_write(regmap, bpd->bus_prot_set, mask);
> > +
> > + return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta, val,
> > + (val & sta_mask) == sta_mask,
> > + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> > +}
> > +
> > +static int scpsys_bus_way_disable(const struct scpsys_bus_prot_data *bpd,
> > + struct regmap *regmap,
> > + struct regmap *ack_regmap)
> > +{
> > + u32 val;
> > + u32 mask = bpd->bus_prot_mask;
> > + u32 sta_mask = bpd->bus_prot_sta_mask;
> > +
> > + if (bpd->bus_prot_reg_update)
> > + regmap_clear_bits(regmap, bpd->bus_prot_set, mask);
> > + else
> > + regmap_write(regmap, bpd->bus_prot_set, mask);
> > +
> > + if (bpd->ignore_clr_ack)
> > + return 0;
> > +
> > + return regmap_read_poll_timeout(ack_regmap, bpd->bus_prot_sta, val,
> > + (val & sta_mask) == sta_mask,
> > + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> > +}
> > +
> > +static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd,
> > + struct regmap *regmap, struct regmap *infracfg_nao)
> > {
> > int i, ret;
> > for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
> > - u32 val, mask = bpd[i].bus_prot_mask;
> > -
> > - if (!mask)
> > + if (!bpd[i].bus_prot_mask)
> > break;
> > - if (bpd[i].bus_prot_reg_update)
> > - regmap_set_bits(regmap, bpd[i].bus_prot_set, mask);
> > + if (bpd[i].way_en)
> > + ret = scpsys_bus_way_disable(&bpd[i], regmap, infracfg_nao);
> > else
> > - regmap_write(regmap, bpd[i].bus_prot_set, mask);
> > -
> > - ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
> > - val, (val & mask) == mask,
> > - MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> > - if (ret)
> > + ret = __scpsys_bus_protect_enable(&bpd[i], regmap);
> > + if (ret) {
> > + pr_err("%s %d %d\n", __PRETTY_FUNCTION__, __LINE__, ret);
> > return ret;
> > + }
> > }
> > return 0;
> > @@ -146,37 +182,71 @@ static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
> > {
> > int ret;
> > - ret = _scpsys_bus_protect_enable(pd->data->bp_infracfg, pd->infracfg);
> > + ret = _scpsys_bus_protect_enable(pd->data->bp_infracfg,
> > + pd->infracfg, pd->infracfg_nao);
> > if (ret)
> > return ret;
> > - return _scpsys_bus_protect_enable(pd->data->bp_smi, pd->smi);
> > + return _scpsys_bus_protect_enable(pd->data->bp_smi, pd->smi, NULL);
> > +}
> > +
> > +static int __scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
> > + struct regmap *regmap)
> > +{
> > + u32 val;
> > + u32 mask = bpd->bus_prot_mask;
> > + u32 sta_mask = bpd->bus_prot_sta_mask;
> > +
> > + if (bpd->bus_prot_reg_update)
> > + regmap_clear_bits(regmap, bpd->bus_prot_clr, mask);
> > + else
> > + regmap_write(regmap, bpd->bus_prot_clr, mask);
> > +
> > + if (bpd->ignore_clr_ack)
> > + return 0;
> > +
> > + return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta, val,
> > + !(val & sta_mask), MTK_POLL_DELAY_US,
> > + MTK_POLL_TIMEOUT);
> > +}
> > +
> > +static int scpsys_bus_way_enable(const struct scpsys_bus_prot_data *bpd,
> > + struct regmap *regmap,
> > + struct regmap *ack_regmap)
> > +{
> > + u32 val;
> > + u32 mask = bpd->bus_prot_mask;
> > + u32 sta_mask = bpd->bus_prot_sta_mask;
> > +
> > + if (bpd->bus_prot_reg_update)
> > + regmap_set_bits(regmap, bpd->bus_prot_clr, mask);
> > + else
> > + regmap_write(regmap, bpd->bus_prot_clr, mask);
> > +
> > + return regmap_read_poll_timeout(ack_regmap, bpd->bus_prot_sta, val,
> > + (val & sta_mask) == sta_mask,
> > + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> > }
> > static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
> > - struct regmap *regmap)
> > + struct regmap *regmap,
> > + struct regmap *infracfg_nao)
> > {
> > int i, ret;
> > for (i = SPM_MAX_BUS_PROT_DATA - 1; i >= 0; i--) {
> > - u32 val, mask = bpd[i].bus_prot_mask;
> > -
> > - if (!mask)
> > + if (!bpd[i].bus_prot_mask)
> > continue;
> > - if (bpd[i].bus_prot_reg_update)
> > - regmap_clear_bits(regmap, bpd[i].bus_prot_clr, mask);
> > + if (bpd[i].way_en)
> > + ret = scpsys_bus_way_enable(&bpd[i], regmap,
> > + infracfg_nao);
> > else
> > - regmap_write(regmap, bpd[i].bus_prot_clr, mask);
> > -
> > - if (bpd[i].ignore_clr_ack)
> > - continue;
> > -
> > - ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
> > - val, !(val & mask),
> > - MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> > - if (ret)
> > + ret = __scpsys_bus_protect_disable(&bpd[i], regmap);
> > + if (ret) {
> > + pr_err("%s %d %d\n", __PRETTY_FUNCTION__, __LINE__, ret);
> > return ret;
> > + }
> > }
> > return 0;
> > @@ -186,11 +256,12 @@ static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
> > {
> > int ret;
> > - ret = _scpsys_bus_protect_disable(pd->data->bp_smi, pd->smi);
> > + ret = _scpsys_bus_protect_disable(pd->data->bp_smi, pd->smi, NULL);
> > if (ret)
> > return ret;
> > - return _scpsys_bus_protect_disable(pd->data->bp_infracfg, pd->infracfg);
> > + return _scpsys_bus_protect_disable(pd->data->bp_infracfg,
> > + pd->infracfg, pd->infracfg_nao);
> > }
> > static int scpsys_regulator_enable(struct regulator *supply)
> > @@ -294,6 +365,21 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
> > return 0;
> > }
> > +static bool scpsys_bp_infracfg_has_way_en(const struct scpsys_bus_prot_data *bpd)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
> > + if (!bpd[i].bus_prot_mask)
> > + break;
>
> So MT8365_POWER_DOMAIN_MM will return false as the first member of
> bp_infracfg is BUS_PROT_WR(...)
I am not sure I understand what you mean. Why should it break out of the
loop if the first member is a BUS_PROT_WR()? BUS_PROT_WR() sets a mask
as well which is checked here exactly the same way as is done in
_scpsys_bus_protect_enable() even before this patch.
This is only a loop condition. Actually I can move it into the loop
header as well. Either you define SPM_MAX_BUS_PROT_DATA fields or you
have to exit if you find a field that is empty, basically the mask not
being set.
>
> Apart from that, why don't you use a CAPS to acheive the same?
>
> > +
> > + if (bpd[i].way_en)
> > + return true;
> > + }
> > +
> > + return false;
> > +}
> > +
> > static struct
> > generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_node *node)
> > {
> > @@ -364,6 +450,20 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
> > return ERR_CAST(pd->smi);
> > }
> > + if (scpsys_bp_infracfg_has_way_en(pd->data->bp_smi)) {
> > + dev_err(scpsys->dev, "bp_smi does not support WAY_EN\n");
>
> Do we really need to check the correctness of the driver data at runtime?
bp_smi is called without a infracfg_nao regmap. If we don't check it
here, we need to make a check during bus protection operations. Last
time I got a review to not do it during in the bus protection path.
>
> > + return ERR_PTR(-EINVAL);
> > + }
> > +
> > + pd->infracfg_nao = syscon_regmap_lookup_by_phandle_optional(
> > + node, "mediatek,infracfg_nao");
>
> Not in the binding description.
Thanks, I will fix that for the next version.
>
> > + if (IS_ERR(pd->infracfg_nao)) {
> > + if (scpsys_bp_infracfg_has_way_en(pd->data->bp_infracfg))
> > + return ERR_CAST(pd->infracfg_nao);
> > +
> > + pd->infracfg_nao = NULL;
> > + }
> > +
> > num_clks = of_clk_get_parent_count(node);
> > if (num_clks > 0) {
> > /* Calculate number of subsys_clks */
> > diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
> > index 7d3c0c36316c..974c68a1d89c 100644
> > --- a/drivers/soc/mediatek/mtk-pm-domains.h
> > +++ b/drivers/soc/mediatek/mtk-pm-domains.h
> > @@ -41,23 +41,29 @@
> > #define SPM_MAX_BUS_PROT_DATA 6
> > -#define _BUS_PROT(_mask, _set, _clr, _sta, _update, _ignore) { \
> > - .bus_prot_mask = (_mask), \
> > - .bus_prot_set = _set, \
> > - .bus_prot_clr = _clr, \
> > - .bus_prot_sta = _sta, \
> > - .bus_prot_reg_update = _update, \
> > - .ignore_clr_ack = _ignore, \
> > +#define _BUS_PROT(_mask, _sta_mask, _set, _clr, _sta, _update, _ignore, _way_en) { \
> > + .bus_prot_mask = (_mask), \
> > + .bus_prot_set = _set, \
> > + .bus_prot_clr = _clr, \
> > + .bus_prot_sta = _sta, \
> > + .bus_prot_sta_mask = _sta_mask, \
> > + .bus_prot_reg_update = _update, \
> > + .ignore_clr_ack = _ignore, \
> > + .way_en = _way_en, \
> > }
> > #define BUS_PROT_WR(_mask, _set, _clr, _sta) \
> > - _BUS_PROT(_mask, _set, _clr, _sta, false, false)
> > + _BUS_PROT(_mask, _mask, _set, _clr, _sta, false, false, false)
> > #define BUS_PROT_WR_IGN(_mask, _set, _clr, _sta) \
> > - _BUS_PROT(_mask, _set, _clr, _sta, false, true)
> > + _BUS_PROT(_mask, _mask, _set, _clr, _sta, false, true, false)
> > #define BUS_PROT_UPDATE(_mask, _set, _clr, _sta) \
> > - _BUS_PROT(_mask, _set, _clr, _sta, true, false)
> > + _BUS_PROT(_mask, _mask, _set, _clr, _sta, true, false, false)
> > +
> > +#define BUS_PROT_WAY_EN(_en_mask, _sta_mask, _set, _sta) \
> > + _BUS_PROT(_en_mask, _sta_mask, _set, _set, _sta, true, false, \
> > + true)
> > #define BUS_PROT_UPDATE_TOPAXI(_mask) \
> > BUS_PROT_UPDATE(_mask, \
> > @@ -70,8 +76,10 @@ struct scpsys_bus_prot_data {
> > u32 bus_prot_set;
> > u32 bus_prot_clr;
> > u32 bus_prot_sta;
> > + u32 bus_prot_sta_mask;
>
> I'm not very happy with the naming. In the end we need an extra mask for bus
> protection using WAY_EN. But right now I can't come up with a good name.
I think the naming is good as it is a specific mask for the status
register. bus_prot_mask is now basically only responsible for set and
clr. Maybe renaming bus_prot_mask to bus_prot_set_clr_mask is better?
Thanks,
Markus
>
> Regards,
> Matthias
>
> > bool bus_prot_reg_update;
> > bool ignore_clr_ack;
> > + bool way_en;
> > };
> > /**
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