linux-kernel - Re: [PATCH 11/15] drm/msm/dsi: Add 14nm phy configuration for SM6125

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Date:   Mon, 26 Jun 2023 11:50:01 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, Lux Aliaga <they@...t.lgbt>
Subject: Re: [PATCH 11/15] drm/msm/dsi: Add 14nm phy configuration for SM6125

On 25.06.2023 22:23, Marijn Suijten wrote:
> On 2023-06-24 03:49:25, Konrad Dybcio wrote:
>> On 24.06.2023 02:41, Marijn Suijten wrote:
>>> SM6125 features only a single PHY (despite a secondary PHY PLL source
>>> being available to the disp_cc_mdss_pclk0_clk_src clock), and downstream
>>> sources for this "trinket" SoC do not define the typical "vcca"
>>> regulator to be available nor used.
>>>
>>> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
>>> ---
>> The introduced ops are identical to 2290, modulo regulator..
> 
> Sure, I can create a "drop unused regulators from 14nm qcm2290 config"
> and a second "reuse qcm2290 14nm dsi phy for sm6125" patch, instead of
> this one.
Please do.

> 
>> But the regulator is absent on both (VDD_MX powers it instead), so
> 
> In the DT patch you requested me to use CX instead of MX... Which one is
> it?
You're confusing DSI host with DSI PHY.

> 
> Also note that I moved it from DSI PHY to DSI0 because that's where the
> rpmpd opps reside.
Both of them need their separate power lines to be active!

Also, OPP is not necessary for genpd activation.

Konrad
> 
> - Marijn
> 
>> feel free to clean that up and reuse it ;)
> 
>>
>> Konrad
>>>  drivers/gpu/drm/msm/dsi/phy/dsi_phy.c      |  2 ++
>>>  drivers/gpu/drm/msm/dsi/phy/dsi_phy.h      |  1 +
>>>  drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c | 15 +++++++++++++++
>>>  3 files changed, 18 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
>>> index 9d5795c58a98..8688ed502dcf 100644
>>> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
>>> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
>>> @@ -559,6 +559,8 @@ static const struct of_device_id dsi_phy_dt_match[] = {
>>>  	  .data = &dsi_phy_14nm_2290_cfgs },
>>>  	{ .compatible = "qcom,dsi-phy-14nm-660",
>>>  	  .data = &dsi_phy_14nm_660_cfgs },
>>> +	{ .compatible = "qcom,dsi-phy-14nm-6125",
>>> +	  .data = &dsi_phy_14nm_6125_cfgs },
>>>  	{ .compatible = "qcom,dsi-phy-14nm-8953",
>>>  	  .data = &dsi_phy_14nm_8953_cfgs },
>>>  #endif
>>> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.h b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.h
>>> index 8b640d174785..ebf915f5e6c6 100644
>>> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.h
>>> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.h
>>> @@ -52,6 +52,7 @@ extern const struct msm_dsi_phy_cfg dsi_phy_20nm_cfgs;
>>>  extern const struct msm_dsi_phy_cfg dsi_phy_14nm_cfgs;
>>>  extern const struct msm_dsi_phy_cfg dsi_phy_14nm_660_cfgs;
>>>  extern const struct msm_dsi_phy_cfg dsi_phy_14nm_2290_cfgs;
>>> +extern const struct msm_dsi_phy_cfg dsi_phy_14nm_6125_cfgs;
>>>  extern const struct msm_dsi_phy_cfg dsi_phy_14nm_8953_cfgs;
>>>  extern const struct msm_dsi_phy_cfg dsi_phy_10nm_cfgs;
>>>  extern const struct msm_dsi_phy_cfg dsi_phy_10nm_8998_cfgs;
>>> 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 3ce45b023e63..5d43c9ec69ae 100644
>>> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
>>> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
>>> @@ -1068,6 +1068,21 @@ const struct msm_dsi_phy_cfg dsi_phy_14nm_660_cfgs = {
>>>  	.num_dsi_phy = 2,
>>>  };
>>>  
>>> +const struct msm_dsi_phy_cfg dsi_phy_14nm_6125_cfgs = {
>>> +	.has_phy_lane = true,
>>> +	.ops = {
>>> +		.enable = dsi_14nm_phy_enable,
>>> +		.disable = dsi_14nm_phy_disable,
>>> +		.pll_init = dsi_pll_14nm_init,
>>> +		.save_pll_state = dsi_14nm_pll_save_state,
>>> +		.restore_pll_state = dsi_14nm_pll_restore_state,
>>> +	},
>>> +	.min_pll_rate = VCO_MIN_RATE,
>>> +	.max_pll_rate = VCO_MAX_RATE,
>>> +	.io_start = { 0x5e94400 },
>>> +	.num_dsi_phy = 1,
>>> +};
>>> +
>>>  const struct msm_dsi_phy_cfg dsi_phy_14nm_8953_cfgs = {
>>>  	.has_phy_lane = true,
>>>  	.regulator_data = dsi_phy_14nm_17mA_regulators,
>>>