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Message-ID: <661fa514-cd37-e062-3294-c844b7f0b894@quicinc.com>
Date:   Tue, 26 Jul 2022 16:53:02 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Douglas Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     <freedreno@...ts.freedesktop.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        David Airlie <airlied@...ux.ie>,
        "Rajeev Nandan" <quic_rajeevny@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        <dri-devel@...ts.freedesktop.org>,
        "Bjorn Andersson" <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        "Mark Brown" <broonie@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Daniel Vetter <daniel@...ll.ch>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        José Expósito <jose.exposito89@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Sean Paul <sean@...rly.run>, <linux-kernel@...r.kernel.org>
Subject: Re: [Freedreno] [PATCH] drm/msm/dsi: Don't set a load before
 disabling a regulator



On 7/25/2022 5:49 PM, Douglas Anderson wrote:
> As of commit 5451781dadf8 ("regulator: core: Only count load for
> enabled consumers"), a load isn't counted for a disabled
> regulator. That means all the code in the DSI driver to specify and
> set loads before disabling a regulator is not actually doing anything
> useful. Let's remove it.
> 
> It should be noted that all of the loads set that were being specified
> were pointless noise anyway. The only use for this number is to pick
> between low power and high power modes of regulators. Regulators
> appear to do this changeover at loads on the order of 10000 uA. You
> would a lot of clients of the same rail for that 100 uA number to

I guess you meant "you would need a lot of clients"

> count for anything.
> 
> Note that now that we get rid of the setting of the load at disable
> time, we can just set the load once when we first get the regulator
> and then forget it.
> 
> It should also be noted that the regulator functions
> regulator_bulk_enable() and regulator_set_load() already print error
> messages when they encounter problems so while moving things around we
> get rid of some extra error prints.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
>   drivers/gpu/drm/msm/dsi/dsi.h                 |  1 -
>   drivers/gpu/drm/msm/dsi/dsi_cfg.c             | 52 +++++++++----------
>   drivers/gpu/drm/msm/dsi/dsi_host.c            | 45 ++++------------
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy.c         | 46 ++++------------
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c    |  4 +-
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c    |  6 +--
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_20nm.c    |  4 +-
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c    |  6 +--
>   .../gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c   |  2 +-
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c     |  6 +--
>   10 files changed, 60 insertions(+), 112 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
> index 580a1e6358bf..bb6a5bd05cb1 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.h
> +++ b/drivers/gpu/drm/msm/dsi/dsi.h
> @@ -37,7 +37,6 @@ enum msm_dsi_phy_usecase {
>   struct dsi_reg_entry {
>   	char name[32];
>   	int enable_load;
> -	int disable_load;
>   };
>   
>   struct dsi_reg_config {
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_cfg.c b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
> index 2c23324a2296..d24742ea32c6 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_cfg.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
> @@ -14,9 +14,9 @@ static const struct msm_dsi_config apq8064_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 3,
>   		.regs = {
> -			{"vdda", 100000, 100},	/* 1.2 V */
> -			{"avdd", 10000, 100},	/* 3.0 V */
> -			{"vddio", 100000, 100},	/* 1.8 V */
> +			{"vdda", 100000},	/* 1.2 V */
> +			{"avdd", 10000},	/* 3.0 V */
> +			{"vddio", 100000},	/* 1.8 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_v2_bus_clk_names,
> @@ -34,9 +34,9 @@ static const struct msm_dsi_config msm8974_apq8084_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 3,
>   		.regs = {
> -			{"vdd", 150000, 100},	/* 3.0 V */
> -			{"vdda", 100000, 100},	/* 1.2 V */
> -			{"vddio", 100000, 100},	/* 1.8 V */
> +			{"vdd", 150000},	/* 3.0 V */
> +			{"vdda", 100000},	/* 1.2 V */
> +			{"vddio", 100000},	/* 1.8 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_6g_bus_clk_names,
> @@ -54,8 +54,8 @@ static const struct msm_dsi_config msm8916_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 2,
>   		.regs = {
> -			{"vdda", 100000, 100},	/* 1.2 V */
> -			{"vddio", 100000, 100},	/* 1.8 V */
> +			{"vdda", 100000},	/* 1.2 V */
> +			{"vddio", 100000},	/* 1.8 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_8916_bus_clk_names,
> @@ -73,8 +73,8 @@ static const struct msm_dsi_config msm8976_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 2,
>   		.regs = {
> -			{"vdda", 100000, 100},	/* 1.2 V */
> -			{"vddio", 100000, 100},	/* 1.8 V */
> +			{"vdda", 100000},	/* 1.2 V */
> +			{"vddio", 100000},	/* 1.8 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_8976_bus_clk_names,
> @@ -88,12 +88,12 @@ static const struct msm_dsi_config msm8994_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 6,
>   		.regs = {
> -			{"vdda", 100000, 100},	/* 1.25 V */
> -			{"vddio", 100000, 100},	/* 1.8 V */
> -			{"vcca", 10000, 100},	/* 1.0 V */
> -			{"vdd", 100000, 100},	/* 1.8 V */
> -			{"lab_reg", -1, -1},
> -			{"ibb_reg", -1, -1},
> +			{"vdda", 100000},	/* 1.25 V */
> +			{"vddio", 100000},	/* 1.8 V */
> +			{"vcca", 10000},	/* 1.0 V */
> +			{"vdd", 100000},	/* 1.8 V */
> +			{"lab_reg", -1},
> +			{"ibb_reg", -1},
>   		},
>   	},
>   	.bus_clk_names = dsi_6g_bus_clk_names,
> @@ -111,9 +111,9 @@ static const struct msm_dsi_config msm8996_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 2,
>   		.regs = {
> -			{"vdda", 18160, 1 },	/* 1.25 V */
> -			{"vcca", 17000, 32 },	/* 0.925 V */
> -			{"vddio", 100000, 100 },/* 1.8 V */
> +			{"vdda", 18160},	/* 1.25 V */
> +			{"vcca", 17000},	/* 0.925 V */
> +			{"vddio", 100000},/* 1.8 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_8996_bus_clk_names,
> @@ -131,8 +131,8 @@ static const struct msm_dsi_config msm8998_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 2,
>   		.regs = {
> -			{"vdd", 367000, 16 },	/* 0.9 V */
> -			{"vdda", 62800, 2 },	/* 1.2 V */
> +			{"vdd", 367000},	/* 0.9 V */
> +			{"vdda", 62800},	/* 1.2 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_msm8998_bus_clk_names,
> @@ -150,7 +150,7 @@ static const struct msm_dsi_config sdm660_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 2,
>   		.regs = {
> -			{"vdda", 12560, 4 },	/* 1.2 V */
> +			{"vdda", 12560},	/* 1.2 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_sdm660_bus_clk_names,
> @@ -172,7 +172,7 @@ static const struct msm_dsi_config sdm845_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdda", 21800, 4 },	/* 1.2 V */
> +			{"vdda", 21800},	/* 1.2 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_sdm845_bus_clk_names,
> @@ -186,7 +186,7 @@ static const struct msm_dsi_config sc7180_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdda", 21800, 4 },	/* 1.2 V */
> +			{"vdda", 21800},	/* 1.2 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_sc7180_bus_clk_names,
> @@ -204,7 +204,7 @@ static const struct msm_dsi_config sc7280_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdda", 8350, 0 },	/* 1.2 V */
> +			{"vdda", 8350},	/* 1.2 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_sc7280_bus_clk_names,
> @@ -222,7 +222,7 @@ static const struct msm_dsi_config qcm2290_dsi_cfg = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdda", 21800, 4 },	/* 1.2 V */
> +			{"vdda", 21800},	/* 1.2 V */
>   		},
>   	},
>   	.bus_clk_names = dsi_qcm2290_bus_clk_names,
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index bab2634ebd11..c59e88d766de 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -259,15 +259,7 @@ static inline struct msm_dsi_host *to_msm_dsi_host(struct mipi_dsi_host *host)
>   static void dsi_host_regulator_disable(struct msm_dsi_host *msm_host)
>   {
It seems like now we can drop this function dsi_host_regulator_disable() 
entirely and just call regulator_bulk_disable() ?
>   	struct regulator_bulk_data *s = msm_host->supplies;
> -	const struct dsi_reg_entry *regs = msm_host->cfg_hnd->cfg->reg_cfg.regs;
>   	int num = msm_host->cfg_hnd->cfg->reg_cfg.num;
> -	int i;
> -
> -	DBG("");
> -	for (i = num - 1; i >= 0; i--)
> -		if (regs[i].disable_load >= 0)
> -			regulator_set_load(s[i].consumer,
> -					   regs[i].disable_load);
>   
>   	regulator_bulk_disable(num, s);
>   }
> @@ -275,35 +267,9 @@ static void dsi_host_regulator_disable(struct msm_dsi_host *msm_host)
>   static int dsi_host_regulator_enable(struct msm_dsi_host *msm_host)
>   {
>   	struct regulator_bulk_data *s = msm_host->supplies;
> -	const struct dsi_reg_entry *regs = msm_host->cfg_hnd->cfg->reg_cfg.regs;
>   	int num = msm_host->cfg_hnd->cfg->reg_cfg.num;
> -	int ret, i;
> -
> -	DBG("");
> -	for (i = 0; i < num; i++) {
> -		if (regs[i].enable_load >= 0) {
> -			ret = regulator_set_load(s[i].consumer,
> -						 regs[i].enable_load);
> -			if (ret < 0) {
> -				pr_err("regulator %d set op mode failed, %d\n",
> -					i, ret);
> -				goto fail;
> -			}
> -		}
> -	}
> -
> -	ret = regulator_bulk_enable(num, s);
> -	if (ret < 0) {
> -		pr_err("regulator enable failed, %d\n", ret);
> -		goto fail;
> -	}
>   
> -	return 0;
> -
> -fail:
> -	for (i--; i >= 0; i--)
> -		regulator_set_load(s[i].consumer, regs[i].disable_load);
> -	return ret;
> +	return regulator_bulk_enable(num, s);
same here?
We can just remove dsi_host_regulator_enable and just call 
regulator_bulk_enable() now?

>   }
>   
>   static int dsi_regulator_init(struct msm_dsi_host *msm_host)
> @@ -323,6 +289,15 @@ static int dsi_regulator_init(struct msm_dsi_host *msm_host)
>   		return ret;
>   	}
>   
> +	for (i = 0; i < num; i++) {
> +		if (regs[i].enable_load >= 0) {
> +			ret = regulator_set_load(s[i].consumer,
> +						 regs[i].enable_load);
> +			if (ret < 0)
> +				return ret;
> +		}
> +	}
> +
>   	return 0;
>   }
>   
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> index a39de3bdc7fa..330c0c4e7f9d 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> @@ -529,20 +529,22 @@ static int dsi_phy_regulator_init(struct msm_dsi_phy *phy)
>   		return ret;
>   	}
>   
> +	for (i = 0; i < num; i++) {
> +		if (regs[i].enable_load >= 0) {
> +			ret = regulator_set_load(s[i].consumer,
> +							regs[i].enable_load);
> +			if (ret < 0)
> +				return ret;
> +		}
> +	}
> +
>   	return 0;
>   }
>   
>   static void dsi_phy_regulator_disable(struct msm_dsi_phy *phy)
>   {
>   	struct regulator_bulk_data *s = phy->supplies;
> -	const struct dsi_reg_entry *regs = phy->cfg->reg_cfg.regs;
>   	int num = phy->cfg->reg_cfg.num;
> -	int i;
> -
> -	DBG("");
> -	for (i = num - 1; i >= 0; i--)
> -		if (regs[i].disable_load >= 0)
> -			regulator_set_load(s[i].consumer, regs[i].disable_load);
>   
>   	regulator_bulk_disable(num, s);
>   }
> @@ -550,37 +552,9 @@ static void dsi_phy_regulator_disable(struct msm_dsi_phy *phy)
>   static int dsi_phy_regulator_enable(struct msm_dsi_phy *phy)
>   {
>   	struct regulator_bulk_data *s = phy->supplies;
> -	const struct dsi_reg_entry *regs = phy->cfg->reg_cfg.regs;
> -	struct device *dev = &phy->pdev->dev;
>   	int num = phy->cfg->reg_cfg.num;
> -	int ret, i;
>   
> -	DBG("");
> -	for (i = 0; i < num; i++) {
> -		if (regs[i].enable_load >= 0) {
> -			ret = regulator_set_load(s[i].consumer,
> -							regs[i].enable_load);
> -			if (ret < 0) {
> -				DRM_DEV_ERROR(dev,
> -					"regulator %d set op mode failed, %d\n",
> -					i, ret);
> -				goto fail;
> -			}
> -		}
> -	}
> -
> -	ret = regulator_bulk_enable(num, s);
> -	if (ret < 0) {
> -		DRM_DEV_ERROR(dev, "regulator enable failed, %d\n", ret);
> -		goto fail;
> -	}
> -
> -	return 0;
> -
> -fail:
> -	for (i--; i >= 0; i--)
> -		regulator_set_load(s[i].consumer, regs[i].disable_load);
> -	return ret;
> +	return regulator_bulk_enable(num, s);
>   }
>   
>   static int dsi_phy_enable_resource(struct msm_dsi_phy *phy)
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
> index 08b015ea1b1e..6a10a1448051 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
> @@ -1033,7 +1033,7 @@ const struct msm_dsi_phy_cfg dsi_phy_10nm_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdds", 36000, 32},
> +			{"vdds", 36000},
>   		},
>   	},
>   	.ops = {
> @@ -1055,7 +1055,7 @@ const struct msm_dsi_phy_cfg dsi_phy_10nm_8998_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdds", 36000, 32},
> +			{"vdds", 36000},
>   		},
>   	},
>   	.ops = {
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> index 8199c53567f4..0f3d4c56c333 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> @@ -1029,7 +1029,7 @@ const struct msm_dsi_phy_cfg dsi_phy_14nm_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vcca", 17000, 32},
> +			{"vcca", 17000},
>   		},
>   	},
>   	.ops = {
> @@ -1050,7 +1050,7 @@ const struct msm_dsi_phy_cfg dsi_phy_14nm_660_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vcca", 73400, 32},
> +			{"vcca", 73400},
>   		},
>   	},
>   	.ops = {
> @@ -1071,7 +1071,7 @@ const struct msm_dsi_phy_cfg dsi_phy_14nm_8953_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vcca", 17000, 32},
> +			{"vcca", 17000},
>   		},
>   	},
>   	.ops = {
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_20nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_20nm.c
> index ee7c418a1c29..b7c621d94981 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_20nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_20nm.c
> @@ -134,8 +134,8 @@ const struct msm_dsi_phy_cfg dsi_phy_20nm_cfgs = {
>   	.reg_cfg = {
>   		.num = 2,
>   		.regs = {
> -			{"vddio", 100000, 100},	/* 1.8 V */
> -			{"vcca", 10000, 100},	/* 1.0 V */
> +			{"vddio", 100000},	/* 1.8 V */
> +			{"vcca", 10000},	/* 1.0 V */
>   		},
>   	},
>   	.ops = {
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
> index 48eab80b548e..6beba387640d 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
> @@ -774,7 +774,7 @@ const struct msm_dsi_phy_cfg dsi_phy_28nm_hpm_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vddio", 100000, 100},
> +			{"vddio", 100000},
>   		},
>   	},
>   	.ops = {
> @@ -795,7 +795,7 @@ const struct msm_dsi_phy_cfg dsi_phy_28nm_hpm_famb_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vddio", 100000, 100},
> +			{"vddio", 100000},
>   		},
>   	},
>   	.ops = {
> @@ -816,7 +816,7 @@ const struct msm_dsi_phy_cfg dsi_phy_28nm_lp_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vddio", 100000, 100},	/* 1.8 V */
> +			{"vddio", 100000},	/* 1.8 V */
>   		},
>   	},
>   	.ops = {
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> index fc56cdcc9ad6..2e942b10fffa 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> @@ -653,7 +653,7 @@ const struct msm_dsi_phy_cfg dsi_phy_28nm_8960_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vddio", 100000, 100},	/* 1.8 V */
> +			{"vddio", 100000},	/* 1.8 V */
>   		},
>   	},
>   	.ops = {
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> index 66ed1919a1db..9c7c49ce1200 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> @@ -1041,7 +1041,7 @@ const struct msm_dsi_phy_cfg dsi_phy_7nm_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdds", 36000, 32},
> +			{"vdds", 36000},
>   		},
>   	},
>   	.ops = {
> @@ -1068,7 +1068,7 @@ const struct msm_dsi_phy_cfg dsi_phy_7nm_8150_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdds", 36000, 32},
> +			{"vdds", 36000},
>   		},
>   	},
>   	.ops = {
> @@ -1090,7 +1090,7 @@ const struct msm_dsi_phy_cfg dsi_phy_7nm_7280_cfgs = {
>   	.reg_cfg = {
>   		.num = 1,
>   		.regs = {
> -			{"vdds", 37550, 0},
> +			{"vdds", 37550},
>   		},
>   	},
>   	.ops = {

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