linux-kernel - Re: [PATCH v10 3/5] drm/msm/dp: add support for DP PLL driver

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Date:   Fri, 14 Aug 2020 16:22:35 -0700
From:   Tanmay Shah <tanmay@...eaurora.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     swboyd@...omium.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        robdclark@...il.com, linux-kernel@...r.kernel.org,
        freedreno@...ts.freedesktop.org, seanpaul@...omium.org,
        daniel@...ll.ch, airlied@...ux.ie, aravindh@...eaurora.org,
        abhinavk@...eaurora.org, khsieh@...eaurora.org,
        Chandan Uddaraju <chandanu@...eaurora.org>,
        Vara Reddy <varar@...eaurora.org>
Subject: Re: [PATCH v10 3/5] drm/msm/dp: add support for DP PLL driver

On 2020-08-14 10:05, Dmitry Baryshkov wrote:
> On 12/08/2020 07:42, Tanmay Shah wrote:
>> From: Chandan Uddaraju <chandanu@...eaurora.org>
>> 
>> Add the needed DP PLL specific files to support
>> display port interface on msm targets.
> 
> [skipped]
> 
>> diff --git a/drivers/gpu/drm/msm/dp/dp_pll_private.h 
>> b/drivers/gpu/drm/msm/dp/dp_pll_private.h
>> new file mode 100644
>> index 000000000000..475ba6ed59ab
>> --- /dev/null
>> +++ b/drivers/gpu/drm/msm/dp/dp_pll_private.h
>> @@ -0,0 +1,98 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/*
>> + * Copyright (c) 2016-2020, The Linux Foundation. All rights 
>> reserved.
>> + */
>> +
>> +#ifndef __DP_PLL_10NM_H
>> +#define __DP_PLL_10NM_H
>> +
>> +#include "dp_pll.h"
>> +#include "dp_reg.h"
>> +
>> +#define DP_VCO_HSCLK_RATE_1620MHZDIV1000    1620000UL
>> +#define DP_VCO_HSCLK_RATE_2700MHZDIV1000    2700000UL
>> +#define DP_VCO_HSCLK_RATE_5400MHZDIV1000    5400000UL
>> +#define DP_VCO_HSCLK_RATE_8100MHZDIV1000    8100000UL
>> +
>> +#define NUM_DP_CLOCKS_MAX            6
>> +
>> +#define DP_PHY_PLL_POLL_SLEEP_US        500
>> +#define DP_PHY_PLL_POLL_TIMEOUT_US        10000
>> +
>> +#define DP_VCO_RATE_8100MHZDIV1000        8100000UL
>> +#define DP_VCO_RATE_9720MHZDIV1000        9720000UL
>> +#define DP_VCO_RATE_10800MHZDIV1000        10800000UL
>> +
>> +struct dp_pll_vco_clk {
>> +    struct clk_hw hw;
>> +    unsigned long    rate;        /* current vco rate */
>> +    u64        min_rate;    /* min vco rate */
>> +    u64        max_rate;    /* max vco rate */
>> +    void        *priv;
>> +};
>> +
>> +struct dp_pll_db {
> 
> This struct should probably go into dp_pll_10nm.c. dp_pll_7nm.c, for
> example, will use slightly different structure.
> 

Sure, it sounds good. I will give it try. Thanks!

>> +    struct msm_dp_pll *base;
>> +
>> +    int id;
>> +    struct platform_device *pdev;
>> +
>> +    /* private clocks: */
>> +    bool fixed_factor_clk[NUM_DP_CLOCKS_MAX];
>> +    struct clk_hw *hws[NUM_DP_CLOCKS_MAX];
> 
> Then these two fields can use exact number of clocks rather than
> NUM_DP_CLOCKS_MAX.
> 

I didn't get this. I think NUM_DP_CLOCKS_MAX is doing same?

>> +    u32 num_hws;
>> +
>> +    /* lane and orientation settings */
>> +    u8 lane_cnt;
>> +    u8 orientation;
>> +
>> +    /* COM PHY settings */
>> +    u32 hsclk_sel;
>> +    u32 dec_start_mode0;
>> +    u32 div_frac_start1_mode0;
>> +    u32 div_frac_start2_mode0;
>> +    u32 div_frac_start3_mode0;
>> +    u32 integloop_gain0_mode0;
>> +    u32 integloop_gain1_mode0;
>> +    u32 vco_tune_map;
>> +    u32 lock_cmp1_mode0;
>> +    u32 lock_cmp2_mode0;
>> +    u32 lock_cmp3_mode0;
>> +    u32 lock_cmp_en;
>> +
>> +    /* PHY vco divider */
>> +    u32 phy_vco_div;
>> +    /*
>> +     * Certain pll's needs to update the same vco rate after resume 
>> in
>> +     * suspend/resume scenario. Cached the vco rate for such plls.
>> +     */
>> +    unsigned long    vco_cached_rate;
>> +    u32        cached_cfg0;
>> +    u32        cached_cfg1;
>> +    u32        cached_outdiv;
>> +
>> +    uint32_t index;
>> +};
>> +
>> +static inline struct dp_pll_vco_clk *to_dp_vco_hw(struct clk_hw *hw)
>> +{
>> +    return container_of(hw, struct dp_pll_vco_clk, hw);
>> +}
>> +
>> +#define to_msm_dp_pll(vco) ((struct msm_dp_pll *)vco->priv)
>> +
>> +#define to_dp_pll_db(x)    ((struct dp_pll_db *)x->priv)
>> +
>> +int dp_vco_set_rate_10nm(struct clk_hw *hw, unsigned long rate,
>> +                unsigned long parent_rate);
>> +unsigned long dp_vco_recalc_rate_10nm(struct clk_hw *hw,
>> +                unsigned long parent_rate);
>> +long dp_vco_round_rate_10nm(struct clk_hw *hw, unsigned long rate,
>> +                unsigned long *parent_rate);
>> +int dp_vco_prepare_10nm(struct clk_hw *hw);
>> +void dp_vco_unprepare_10nm(struct clk_hw *hw);
>> +
>> +int msm_dp_pll_10nm_init(struct msm_dp_pll *dp_pll, int id);
>> +void msm_dp_pll_10nm_deinit(struct msm_dp_pll *dp_pll);
> 
> These functions don't seem to be used outside of dp_pll_10nm. What
> about making them static?

I can't declare static to "init" and "deinit" as they are exported to 
dp_pll.c.
Rest of them I can move to dp_pll_10nm and then define static.