Re: [PATCH 6/8] soc: mediatek: Add support for WAY_EN operations
From: Matthias Brugger <matthias.bgg@gmail.com>
Date: 2023-02-03 12:49:46
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linux-devicetree, linux-mediatek, lkml
On 05/01/2023 18:07, Markus Schneider-Pargmann wrote:
quoted hunk ↗ jump to hunk
From: Alexandre Bailon <redacted> 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 <redacted> Signed-off-by: Fabien Parent <redacted> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com> --- Notes: Changes in v4: - Redesigned the patch to be better to understand and have less code duplication 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 | 57 ++++++++++++++++++++------- drivers/soc/mediatek/mtk-pm-domains.h | 16 ++++++-- 2 files changed, 54 insertions(+), 19 deletions(-)diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c index 999e1f6c86b0..d53309f050ee 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;@@ -118,10 +119,13 @@ static int scpsys_sram_disable(struct scpsys_domain *pd) } static int scpsys_bus_protect_clear(const struct scpsys_bus_prot_data *bpd, - struct regmap *regmap) + struct regmap *regmap, + struct regmap *sta_regmap)
I had a look at this and I don't like the idea to add another regmap that's used based on flag in scpsys_bus_prot_data. Up to now the assumption was that the different actions to enable/disable bus protection were done using one regmap. For this reason the regmap was defined once in scpsys_domain. It's not a good design to just pass more and more regmaps or other members to the functions. We should try to find a better way to structure the data so that it fulfills our needs. Possible solutions I can think of right now: a) Pass a struct of two regmaps to _scpsys_bus_protect_[disable,enable]() We can pass the second regmap only if pd->way_en is set, otherwise it will be ignored anyway. It's less flexible if in the future we need another regmap. We will have two a flag to mark we use way_en twice, in struct scpsys_domain and in struct scpsys_domain_data. Please see my comment below. It's something else to think about. b) Add a flag field to scpsys_bus_prot_data to say explicitely if we want to use infracfg, smi with/without way_en. Then we can pass all three regmaps in a struct, it will be easy to add new regmaps in the future. Downsides: 1) We will overload even more the _BUS_PROT macros, which get's hard to read and understand already. Maybe that can somehow be fixed. An idea would be by adding a bit field to scpsys_bus_prot_data. 2) We will need to rework all the scpsys_domain_data structures for all SoCs already supported. It's doable, but it's some extra work. Any other ideas?
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{ u32 val; u32 sta_mask = bpd->bus_prot_sta_mask; + /* way_en acknowledges successful clear with the bit being set */ + u32 expected_ack = (bpd->way_en ? sta_mask : 0); if (bpd->bus_prot_reg_update) regmap_clear_bits(regmap, bpd->bus_prot_clr, bpd->bus_prot_set_clr_mask);@@ -131,13 +135,14 @@ static int scpsys_bus_protect_clear(const struct scpsys_bus_prot_data *bpd, if (bpd->ignore_clr_ack) return 0; - return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta, - val, !(val & sta_mask), + return regmap_read_poll_timeout(sta_regmap, bpd->bus_prot_sta, + val, (val & sta_mask) == expected_ack, MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); } static int scpsys_bus_protect_set(const struct scpsys_bus_prot_data *bpd, - struct regmap *regmap) + struct regmap *regmap, + struct regmap *sta_regmap) { u32 val; u32 sta_mask = bpd->bus_prot_sta_mask;@@ -147,12 +152,13 @@ static int scpsys_bus_protect_set(const struct scpsys_bus_prot_data *bpd, else regmap_write(regmap, bpd->bus_prot_set, bpd->bus_prot_set_clr_mask); - return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta, + return regmap_read_poll_timeout(sta_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) +static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, + struct regmap *regmap, struct regmap *infracfg_nao) { int i, ret;@@ -160,9 +166,14 @@ static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, st if (!bpd[i].bus_prot_set_clr_mask) break; - ret = scpsys_bus_protect_set(&bpd[i], regmap); - if (ret) + if (bpd[i].way_en) + ret = scpsys_bus_protect_clear(&bpd[i], regmap, infracfg_nao); + else + ret = scpsys_bus_protect_set(&bpd[i], regmap, regmap); + if (ret) { + pr_err("%s %d %d\n", __PRETTY_FUNCTION__, __LINE__, ret); return ret; + } } return 0;@@ -172,15 +183,17 @@ 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) + struct regmap *regmap, + struct regmap *infracfg_nao) { int i, ret;@@ -188,9 +201,14 @@ static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd, if (!bpd[i].bus_prot_set_clr_mask) continue; - ret = scpsys_bus_protect_clear(&bpd[i], regmap); - if (ret) + if (bpd[i].way_en) + ret = scpsys_bus_protect_set(&bpd[i], regmap, infracfg_nao); + else + ret = scpsys_bus_protect_clear(&bpd[i], regmap, regmap); + if (ret) { + pr_err("%s %d %d\n", __PRETTY_FUNCTION__, __LINE__, ret); return ret; + } } return 0;@@ -200,11 +218,12 @@ 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)@@ -378,6 +397,14 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no return ERR_CAST(pd->smi); } + pd->infracfg_nao = syscon_regmap_lookup_by_phandle(node, "mediatek,infracfg-nao"); + if (IS_ERR(pd->infracfg_nao)) { + if (MTK_SCPD_CAPS(pd, MTK_SCPD_HAS_WAY_EN)) + return ERR_CAST(pd->infracfg_nao);
I don't like the fact that we have a caps to show we have WAY_EN and then we have a bool in scpsys_bus_prot_data to flag when we need to use the second regmap and the expected_ack mask. Can't we just make the lookup optional and let it all blow up if DTS is wrong because no infracfg-nao was defined while there is at least one domain using way_en? Regards, Matthias
quoted hunk ↗ jump to hunk
+ + 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 34642a279213..1fa634509db1 100644 --- a/drivers/soc/mediatek/mtk-pm-domains.h +++ b/drivers/soc/mediatek/mtk-pm-domains.h@@ -10,6 +10,7 @@ #define MTK_SCPD_DOMAIN_SUPPLY BIT(4) /* can't set MTK_SCPD_KEEP_DEFAULT_OFF at the same time */ #define MTK_SCPD_ALWAYS_ON BIT(5) +#define MTK_SCPD_HAS_WAY_EN BIT(6) #define MTK_SCPD_CAPS(_scpd, _x) ((_scpd)->data->caps & (_x)) #define SPM_VDE_PWR_CON 0x0210@@ -41,7 +42,7 @@ #define SPM_MAX_BUS_PROT_DATA 6 -#define _BUS_PROT(_set_clr_mask, _set, _clr, _sta_mask, _sta, _update, _ignore) { \ +#define _BUS_PROT(_set_clr_mask, _set, _clr, _sta_mask, _sta, _update, _ignore, _way_en) { \ .bus_prot_set_clr_mask = (_set_clr_mask), \ .bus_prot_set = _set, \ .bus_prot_clr = _clr, \@@ -49,16 +50,20 @@ .bus_prot_sta = _sta, \ .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, _mask, _sta, false, false) + _BUS_PROT(_mask, _set, _clr, _mask, _sta, false, false, false) #define BUS_PROT_WR_IGN(_mask, _set, _clr, _sta) \ - _BUS_PROT(_mask, _set, _clr, _mask, _sta, false, true) + _BUS_PROT(_mask, _set, _clr, _mask, _sta, false, true, false) #define BUS_PROT_UPDATE(_mask, _set, _clr, _sta) \ - _BUS_PROT(_mask, _set, _clr, _mask, _sta, true, false) + _BUS_PROT(_mask, _set, _clr, _mask, _sta, true, false, false) + +#define BUS_PROT_WAY_EN(_set_mask, _set, _sta_mask, _sta) \ + _BUS_PROT(_set_mask, _set, _set, _sta_mask, _sta, true, false, true) #define BUS_PROT_UPDATE_TOPAXI(_mask) \ BUS_PROT_UPDATE(_mask, \@@ -77,6 +82,8 @@ * write the whole register. * @ignore_clk_ack: Ignore the result in the status register for clear * operations. + * @way_en: Enable a way in the SoC. For this type the status bit to acknowledge + * the change is always 1 on successful change. */ struct scpsys_bus_prot_data { u32 bus_prot_set_clr_mask;@@ -86,6 +93,7 @@ struct scpsys_bus_prot_data { u32 bus_prot_sta; bool bus_prot_reg_update; bool ignore_clr_ack; + bool way_en; }; /**
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