Re: [PATCH 06/12] soc: mediatek: pm-domains: Add SMI block as bus protection block

Weiyi Lu
2020-09-25T10:45:55Z

On Thu, 2020-09-10 at 19:28 +0200, Enric Balletbo i Serra wrote:
> From: Matthias Brugger <mbrugger@suse.com>
>
> Apart from the infracfg block, the SMI block is used to enable the bus
> protection for some power domains. Add support for this block.
>
> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---
>
> drivers/soc/mediatek/mtk-pm-domains.c | 64 ++++++++++++++++++++-------
> include/linux/soc/mediatek/infracfg.h | 6 +++
> 2 files changed, 53 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> index f609c2d454fa..3aa430a60602 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.c
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> @@ -56,8 +56,25 @@
>
> #define SPM_MAX_BUS_PROT_DATA 3
>
> +#define _BUS_PROT(_mask, _set, _clr, _sta, _update) { \
> + .bus_prot_mask = (_mask), \
> + .bus_prot_set = _set, \
> + .bus_prot_clr = _clr, \
> + .bus_prot_sta = _sta, \
> + .bus_prot_reg_update = _update, \
> + }
> +
> +#define BUS_PROT_WR(_mask, _set, _clr, _sta) \
> + _BUS_PROT(_mask, _set, _clr, _sta, false)
> +
> +#define BUS_PROT_UPDATE(_mask, _set, _clr, _sta) \
> + _BUS_PROT(_mask, _set, _clr, _sta, true)
> +
> struct scpsys_bus_prot_data {
> u32 bus_prot_mask;
> + u32 bus_prot_set;
> + u32 bus_prot_clr;
> + u32 bus_prot_sta;
> bool bus_prot_reg_update;
> };
>
> @@ -69,6 +86,7 @@ struct scpsys_bus_prot_data {
> * @sram_pdn_ack_bits: The mask for sram power control acked bits.
> * @caps: The flag for active wake-up action.
> * @bp_infracfg: bus protection for infracfg subsystem
> + * @bp_smi: bus protection for smi subsystem
> */
> struct scpsys_domain_data {
> u32 sta_mask;
> @@ -77,6 +95,7 @@ struct scpsys_domain_data {
> u32 sram_pdn_ack_bits;
> u8 caps;
> const struct scpsys_bus_prot_data bp_infracfg[SPM_MAX_BUS_PROT_DATA];
> + const struct scpsys_bus_prot_data bp_smi[SPM_MAX_BUS_PROT_DATA];
> };
>
> struct scpsys_domain {
> @@ -86,6 +105,7 @@ struct scpsys_domain {
> int num_clks;
> struct clk_bulk_data *clks;
> struct regmap *infracfg;
> + struct regmap *smi;
> };
>
> struct scpsys_soc_data {
> @@ -173,9 +193,9 @@ static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, st
> if (bpd[i].bus_prot_reg_update)
> regmap_update_bits(regmap, INFRA_TOPAXI_PROTECTEN, mask, mask);
> else
> - regmap_write(regmap, INFRA_TOPAXI_PROTECTEN_SET, mask);
> + regmap_write(regmap, bpd[i].bus_prot_set, mask);
>

Could it be?

if (bpd[i].bus_prot_set)
regmap_write(regmap, bpd[i].bus_prot_set, mask);
else
regmap_update_bits(regmap, INFRA_TOPAXI_PROTECTEN, mask, mask);

> - ret = regmap_read_poll_timeout(regmap, INFRA_TOPAXI_PROTECTSTA1,
> + ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
> val, (val & mask) == mask,
> MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> if (ret)
> @@ -191,7 +211,11 @@ static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
> int ret;
>
> ret = _scpsys_bus_protect_enable(bpd, pd->infracfg);
> - return ret;
> + if (ret)
> + return ret;
> +
> + bpd = pd->data->bp_smi;
> + return _scpsys_bus_protect_enable(bpd, pd->smi);
> }
>
> static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
> @@ -206,11 +230,11 @@ static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
> return 0;
>
> if (bpd[i].bus_prot_reg_update)

ditto.

> - regmap_update_bits(regmap, INFRA_TOPAXI_PROTECTEN, mask, 0);
> + regmap_update_bits(regmap, bpd[i].bus_prot_set, mask, 0);
> else
> - regmap_write(regmap, INFRA_TOPAXI_PROTECTEN_CLR, mask);
> + regmap_write(regmap, bpd[i].bus_prot_clr, mask);
>
> - ret = regmap_read_poll_timeout(regmap, INFRA_TOPAXI_PROTECTSTA1,
> + ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
> val, !(val & mask),
> MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> if (ret)
> @@ -226,7 +250,11 @@ static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
> int ret;
>
> ret = _scpsys_bus_protect_disable(bpd, pd->infracfg);
> - return ret;
> + if (ret)
> + return ret;
> +
> + bpd = pd->data->bp_smi;
> + return _scpsys_bus_protect_disable(bpd, pd->smi);

It should have a reverse order compared to the enable control. But I'd
like to make it more flexible to any sequence, like INFRA->SMI->INFRA

> }
>
> static int scpsys_power_on(struct generic_pm_domain *genpd)
> @@ -360,6 +388,10 @@ static int scpsys_add_one_domain(struct scpsys *scpsys, struct device_node *node
> if (IS_ERR(pd->infracfg))
> pd->infracfg = NULL;
>
> + pd->smi = syscon_regmap_lookup_by_phandle(node, "mediatek,smi");
> + if (IS_ERR(pd->smi))
> + pd->smi = NULL;
> +
> pd->num_clks = of_clk_get_parent_count(node);
> if (pd->num_clks > 0) {
> pd->clks = devm_kcalloc(scpsys->dev, pd->num_clks, sizeof(*pd->clks), GFP_KERNEL);
> @@ -532,10 +564,9 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8173[] = {
> .ctl_offs = SPM_DIS_PWR_CON,
> .sram_pdn_bits = GENMASK(11, 8),
> .sram_pdn_ack_bits = GENMASK(12, 12),
> - .bp_infracfg[0] = {
> - .bus_prot_reg_update = true,
> - .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 |
> - MT8173_TOP_AXI_PROT_EN_MM_M1,
> + .bp_infracfg = {
> + BUS_PROT_UPDATE_MT8173(MT8173_TOP_AXI_PROT_EN_MM_M0 |
> + MT8173_TOP_AXI_PROT_EN_MM_M1),
> },
> },
> [MT8173_POWER_DOMAIN_VENC_LT] = {
> @@ -574,12 +605,11 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8173[] = {
> .ctl_offs = SPM_MFG_PWR_CON,
> .sram_pdn_bits = GENMASK(13, 8),
> .sram_pdn_ack_bits = GENMASK(21, 16),
> - .bp_infracfg[0] = {
> - .bus_prot_reg_update = true,
> - .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MFG_S |
> - MT8173_TOP_AXI_PROT_EN_MFG_M0 |
> - MT8173_TOP_AXI_PROT_EN_MFG_M1 |
> - MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT,
> + .bp_infracfg = {
> + BUS_PROT_UPDATE_MT8173(MT8173_TOP_AXI_PROT_EN_MFG_S |
> + MT8173_TOP_AXI_PROT_EN_MFG_M0 |
> + MT8173_TOP_AXI_PROT_EN_MFG_M1 |
> + MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT),
> },
> },
> };
> diff --git a/include/linux/soc/mediatek/infracfg.h b/include/linux/soc/mediatek/infracfg.h
> index f967d02cc2ff..3f18cddffb44 100644
> --- a/include/linux/soc/mediatek/infracfg.h
> +++ b/include/linux/soc/mediatek/infracfg.h
> @@ -37,6 +37,12 @@
> #define INFRA_TOPAXI_PROTECTEN_SET 0x0260
> #define INFRA_TOPAXI_PROTECTEN_CLR 0x0264
>
> +#define BUS_PROT_UPDATE_MT8173(_mask) \
> + BUS_PROT_UPDATE(_mask, \
> + INFRA_TOPAXI_PROTECTEN, \
> + INFRA_TOPAXI_PROTECTEN_CLR, \
> + INFRA_TOPAXI_PROTECTSTA1)
> +
> int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask,
> bool reg_update);
> int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask,