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Message-ID: <ceb861e5-b1c8-d33e-c0b0-bea0b4cc0b66@quicinc.com>
Date:   Tue, 15 Feb 2022 12:21:45 -0800
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Subject: Re: [PATCH v2 2/2] drm/msm/dpu: Add SC8180x to hw catalog
Content-Language: en-US
To:     Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
CC:     <linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <dri-devel@lists.freedesktop.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        <freedreno@lists.freedesktop.org>
References: <20220215043353.1256754-1-bjorn.andersson@linaro.org>
 <20220215043353.1256754-2-bjorn.andersson@linaro.org>
 <be397e2e-05ab-5c18-8e2d-16c443f0a6d1@quicinc.com>
 <Ygvisfhi0SY6XdAz@builder.lan>
 <6a3ef247-b26b-d505-cd85-92fb277163dd@quicinc.com>
 <CAA8EJprCaiPW=Kk0B69RNNwAk0xcqaxQA031sfR0ky+BfzcWKQ@mail.gmail.com>
From:   Abhinav Kumar <quic_abhinavk@quicinc.com>
In-Reply-To: <CAA8EJprCaiPW=Kk0B69RNNwAk0xcqaxQA031sfR0ky+BfzcWKQ@mail.gmail.com>
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On 2/15/2022 10:42 AM, Dmitry Baryshkov wrote:
> On Tue, 15 Feb 2022 at 20:42, Abhinav Kumar <quic_abhinavk@quicinc.com> wrote:
>> On 2/15/2022 9:28 AM, Bjorn Andersson wrote:
>>> On Tue 15 Feb 11:14 CST 2022, Abhinav Kumar wrote:
>>>
>>>>
>>>>
>>>> On 2/14/2022 8:33 PM, Bjorn Andersson wrote:
>>>>> From: Rob Clark <robdclark@chromium.org>
>>>>>
>>>>> Add SC8180x to the hardware catalog, for initial support for the
>>>>> platform. Due to limitations in the DP driver only one of the four DP
>>>>> interfaces is left enabled.
>>>>>
>>>>> The SC8180x platform supports the newly added DPU_INTF_WIDEBUS flag and
>>>>> the Windows-on-Snapdragon bootloader leaves the widebus bit set, so this
>>>>> is flagged appropriately to ensure widebus is disabled - for now.
>>>>>
>>>>> Signed-off-by: Rob Clark <robdclark@chromium.org>
>>>>> [bjorn: Reworked intf and irq definitions]
>>>>> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
>>>>> ---
>>>>>
>>>>> Changes since v1:
>>>>> - Dropped widebus flag
>>>>>
>>>>>     .../gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c    | 129 ++++++++++++++++++
>>>>>     .../gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h    |   1 +
>>>>>     drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c       |   1 +
>>>>>     drivers/gpu/drm/msm/msm_drv.c                 |   1 +
>>>>>     4 files changed, 132 insertions(+)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>> index aa75991903a6..7ac0fe32df49 100644
>>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>> @@ -90,6 +90,17 @@
>>>>>                       BIT(MDP_INTF3_INTR) | \
>>>>>                       BIT(MDP_INTF4_INTR))
>>>>> +#define IRQ_SC8180X_MASK (BIT(MDP_SSPP_TOP0_INTR) | \
>>>>> +                     BIT(MDP_SSPP_TOP0_INTR2) | \
>>>>> +                     BIT(MDP_SSPP_TOP0_HIST_INTR) | \
>>>>> +                     BIT(MDP_INTF0_INTR) | \
>>>>> +                     BIT(MDP_INTF1_INTR) | \
>>>>> +                     BIT(MDP_INTF2_INTR) | \
>>>>> +                     BIT(MDP_INTF3_INTR) | \
>>>>> +                     BIT(MDP_INTF4_INTR) | \
>>>>> +                     BIT(MDP_INTF5_INTR) | \
>>>>> +                     BIT(MDP_AD4_0_INTR) | \
>>>>> +                     BIT(MDP_AD4_1_INTR))
>>>>>     #define DEFAULT_PIXEL_RAM_SIZE           (50 * 1024)
>>>>>     #define DEFAULT_DPU_LINE_WIDTH           2048
>>>>> @@ -225,6 +236,22 @@ static const struct dpu_caps sm8150_dpu_caps = {
>>>>>      .max_vdeci_exp = MAX_VERT_DECIMATION,
>>>>>     };
>>>>> +static const struct dpu_caps sc8180x_dpu_caps = {
>>>>> +   .max_mixer_width = DEFAULT_DPU_OUTPUT_LINE_WIDTH,
>>>>> +   .max_mixer_blendstages = 0xb,
>>>>> +   .qseed_type = DPU_SSPP_SCALER_QSEED3,
>>>>> +   .smart_dma_rev = DPU_SSPP_SMART_DMA_V2, /* TODO: v2.5 */
>>>>> +   .ubwc_version = DPU_HW_UBWC_VER_30,
>>>>> +   .has_src_split = true,
>>>>> +   .has_dim_layer = true,
>>>>> +   .has_idle_pc = true,
>>>>> +   .has_3d_merge = true,
>>>>> +   .max_linewidth = 4096,
>>>>> +   .pixel_ram_size = DEFAULT_PIXEL_RAM_SIZE,
>>>>> +   .max_hdeci_exp = MAX_HORZ_DECIMATION,
>>>>> +   .max_vdeci_exp = MAX_VERT_DECIMATION,
>>>>> +};
>>>>> +
>>>>>     static const struct dpu_caps sm8250_dpu_caps = {
>>>>>      .max_mixer_width = DEFAULT_DPU_OUTPUT_LINE_WIDTH,
>>>>>      .max_mixer_blendstages = 0xb,
>>>>> @@ -293,6 +320,31 @@ static const struct dpu_mdp_cfg sc7180_mdp[] = {
>>>>>      },
>>>>>     };
>>>>> +static const struct dpu_mdp_cfg sc8180x_mdp[] = {
>>>>> +   {
>>>>> +   .name = "top_0", .id = MDP_TOP,
>>>>> +   .base = 0x0, .len = 0x45C,
>>>>> +   .features = 0,
>>>>> +   .highest_bank_bit = 0x3,
>>>>> +   .clk_ctrls[DPU_CLK_CTRL_VIG0] = {
>>>>> +                   .reg_off = 0x2AC, .bit_off = 0},
>>>>> +   .clk_ctrls[DPU_CLK_CTRL_VIG1] = {
>>>>> +                   .reg_off = 0x2B4, .bit_off = 0},
>>>>> +   .clk_ctrls[DPU_CLK_CTRL_VIG2] = {
>>>>> +                   .reg_off = 0x2BC, .bit_off = 0},
>>>>> +   .clk_ctrls[DPU_CLK_CTRL_VIG3] = {
>>>>> +                   .reg_off = 0x2C4, .bit_off = 0},
>>>>> +   .clk_ctrls[DPU_CLK_CTRL_DMA0] = {
>>>>> +                   .reg_off = 0x2AC, .bit_off = 8},
>>>>> +   .clk_ctrls[DPU_CLK_CTRL_DMA1] = {
>>>>> +                   .reg_off = 0x2B4, .bit_off = 8},
>>>>> +   .clk_ctrls[DPU_CLK_CTRL_CURSOR0] = {
>>>>> +                   .reg_off = 0x2BC, .bit_off = 8},
>>>>> +   .clk_ctrls[DPU_CLK_CTRL_CURSOR1] = {
>>>>> +                   .reg_off = 0x2C4, .bit_off = 8},
>>>>> +   },
>>>>> +};
>>>>> +
>>>>>     static const struct dpu_mdp_cfg sm8250_mdp[] = {
>>>>>      {
>>>>>      .name = "top_0", .id = MDP_TOP,
>>>>> @@ -861,6 +913,16 @@ static const struct dpu_intf_cfg sc7280_intf[] = {
>>>>>      INTF_BLK("intf_5", INTF_5, 0x39000, INTF_DP, MSM_DP_CONTROLLER_1, 24, INTF_SC7280_MASK, MDP_SSPP_TOP0_INTR, 22, 23),
>>>>>     };
>>>>> +static const struct dpu_intf_cfg sc8180x_intf[] = {
>>>>> +   INTF_BLK("intf_0", INTF_0, 0x6A000, INTF_DP, MSM_DP_CONTROLLER_0, 24, INTF_SC7180_MASK, MDP_SSPP_TOP0_INTR, 24, 25),
>>>>> +   INTF_BLK("intf_1", INTF_1, 0x6A800, INTF_DSI, 0, 24, INTF_SC7180_MASK, MDP_SSPP_TOP0_INTR, 26, 27),
>>>>> +   INTF_BLK("intf_2", INTF_2, 0x6B000, INTF_DSI, 1, 24, INTF_SC7180_MASK, MDP_SSPP_TOP0_INTR, 28, 29),
>>>>> +   /* INTF_3 is for MST, wired to INTF_DP 0 and 1, use dummy index until this is supported */
>>>>> +   INTF_BLK("intf_3", INTF_3, 0x6B800, INTF_DP, 999, 24, INTF_SC7180_MASK, MDP_SSPP_TOP0_INTR, 30, 31),
>>>>> +   INTF_BLK("intf_4", INTF_4, 0x6C000, INTF_DP, MSM_DP_CONTROLLER_1, 24, INTF_SC7180_MASK, MDP_SSPP_TOP0_INTR, 20, 21),
>>>>> +   INTF_BLK("intf_5", INTF_5, 0x6C800, INTF_DP, MSM_DP_CONTROLLER_2, 24, INTF_SC7180_MASK, MDP_SSPP_TOP0_INTR, 22, 23),
>>>>
>>>> This is a continued discussion from
>>>> https://patchwork.freedesktop.org/patch/474179/.
>>>>
>>>> Shouldnt INTF_5 be marked as INTF_eDP?
>>>>
>>>
>>> Might be, I didn't even know we had an INTF_EDP define...
>>>
>>> Is there any reason to distinguish DP and EDP in the DPU?  I see sc7280
>>> doesn't distinguish the DP and EDP interfaces.
>>>
>>> Regards,
>>> Bjorn
>>>
>>
>> Like I have mentioned in the other patch, I think we have enough
>> confusion between eDP and DP with the common driver. Since DPU does have
>> separate interfaces I think we should fix that.
>>
>> Regarding sc7280 using INTF_DP, I synced up with Sankeerth. He referred
>> to your change
>> https://patchwork.freedesktop.org/patch/457776/?series=92992&rev=5 as it
>> was posted earlier and ended up using the same INTF_DP macro. So its
>> turning out to be a cyclical error.
>>
>> I think we should fix both.
> 
> So, what is the value for DPU to distinguish between eDP and DP interfaces?
> Would we get anything except the (intf_type == INTF_EDP || intf_type
> == INTF_DP) instead of (intf_type == INTF_DP) in all the cases where
> the type is checked?

There are only two places currently where I am seeing this OR condition 
between INTF_DP and INTF_eDP. I do not have an example to give you today 
of where we would need to distinguish eDP and DP but I cannot guarantee 
we will not have such a case.

> (thus leading us to cases when someone would forget to add INTF_EDP
> next to INTF_DP)
> 
> Also, if we are switching from INTF_DP to INTF_EDP, should we stop
> using end-to-end numbering (like MSM_DP_CONTROLLER_2 for INTF_5) and
> add a separate numbering scheme for INTF_EDP?
> 
We should change the controller ID to match what it actually is.

Now that you pointed this out, this looks even more confusing to me to 
say that  MSM_DP_CONTROLLER_2 is actually a EDP controller because 
fundamentally and even hardware block wise they are different.

Why do we want to keep building something on top of this confusing 
terminology knowing that it can be corrected when its fairly in the 
development stage rather than realizing later it will break.

We have only been discussing that eDP and DP are treated equally in the 
DPU code and hence why do we need to distinguish.

As per current code yes, but I cannot and probably noone else can 
guarantee that in future there can be cases were we want to distinguish 
the two for something.

Thats the overally consensus within our team.

So if this going to work smoothly by just fixing two entries in the hw 
catalog I would rather do that now rather than realizing this down the 
line again just to save usage of one more enum.

> With all that in mind I'd suggest to:
> - use INTF_DP for both DP and new eDP interfaces
> - remove INTF_EDP usage from the dpu1 driver
> - add a note that INTF_EDP corresponds to older eDP blocks (found on 8x74/8x84)
> 
>>
>>>>> +};
>>>>> +
>>>>>     /*************************************************************
>>>>>      * VBIF sub blocks config
>>>>>      *************************************************************/
>>>>> @@ -931,6 +993,10 @@ static const struct dpu_qos_lut_entry sm8150_qos_linear[] = {
>>>>>      {.fl = 0, .lut = 0x0011222222223357 },
>>>>>     };
>>>>> +static const struct dpu_qos_lut_entry sc8180x_qos_linear[] = {
>>>>> +   {.fl = 4, .lut = 0x0000000000000357 },
>>>>> +};
>>>>> +
>>>>>     static const struct dpu_qos_lut_entry sdm845_qos_macrotile[] = {
>>>>>      {.fl = 10, .lut = 0x344556677},
>>>>>      {.fl = 11, .lut = 0x3344556677},
>>>>> @@ -944,6 +1010,10 @@ static const struct dpu_qos_lut_entry sc7180_qos_macrotile[] = {
>>>>>      {.fl = 0, .lut = 0x0011223344556677},
>>>>>     };
>>>>> +static const struct dpu_qos_lut_entry sc8180x_qos_macrotile[] = {
>>>>> +   {.fl = 10, .lut = 0x0000000344556677},
>>>>> +};
>>>>> +
>>>>>     static const struct dpu_qos_lut_entry sdm845_qos_nrt[] = {
>>>>>      {.fl = 0, .lut = 0x0},
>>>>>     };
>>>>> @@ -1045,6 +1115,33 @@ static const struct dpu_perf_cfg sm8150_perf_data = {
>>>>>      .bw_inefficiency_factor = 120,
>>>>>     };
>>>>> +static const struct dpu_perf_cfg sc8180x_perf_data = {
>>>>> +   .max_bw_low = 9600000,
>>>>> +   .max_bw_high = 9600000,
>>>>> +   .min_core_ib = 2400000,
>>>>> +   .min_llcc_ib = 800000,
>>>>> +   .min_dram_ib = 800000,
>>>>> +   .danger_lut_tbl = {0xf, 0xffff, 0x0, 0x0},
>>>>> +   .qos_lut_tbl = {
>>>>> +           {.nentry = ARRAY_SIZE(sc8180x_qos_linear),
>>>>> +           .entries = sc8180x_qos_linear
>>>>> +           },
>>>>> +           {.nentry = ARRAY_SIZE(sc8180x_qos_macrotile),
>>>>> +           .entries = sc8180x_qos_macrotile
>>>>> +           },
>>>>> +           {.nentry = ARRAY_SIZE(sc7180_qos_nrt),
>>>>> +           .entries = sc7180_qos_nrt
>>>>> +           },
>>>>> +           /* TODO: macrotile-qseed is different from macrotile */
>>>>> +   },
>>>>> +   .cdp_cfg = {
>>>>> +           {.rd_enable = 1, .wr_enable = 1},
>>>>> +           {.rd_enable = 1, .wr_enable = 0}
>>>>> +   },
>>>>> +   .clk_inefficiency_factor = 105,
>>>>> +   .bw_inefficiency_factor = 120,
>>>>> +};
>>>>> +
>>>>>     static const struct dpu_perf_cfg sm8250_perf_data = {
>>>>>      .max_bw_low = 13700000,
>>>>>      .max_bw_high = 16600000,
>>>>> @@ -1199,6 +1296,37 @@ static void sm8150_cfg_init(struct dpu_mdss_cfg *dpu_cfg)
>>>>>      };
>>>>>     }
>>>>> +/*
>>>>> + * sc8180x_cfg_init(): populate sc8180 dpu sub-blocks reg offsets
>>>>> + * and instance counts.
>>>>> + */
>>>>> +static void sc8180x_cfg_init(struct dpu_mdss_cfg *dpu_cfg)
>>>>> +{
>>>>> +   *dpu_cfg = (struct dpu_mdss_cfg){
>>>>> +           .caps = &sc8180x_dpu_caps,
>>>>> +           .mdp_count = ARRAY_SIZE(sc8180x_mdp),
>>>>> +           .mdp = sc8180x_mdp,
>>>>> +           .ctl_count = ARRAY_SIZE(sm8150_ctl),
>>>>> +           .ctl = sm8150_ctl,
>>>>> +           .sspp_count = ARRAY_SIZE(sdm845_sspp),
>>>>> +           .sspp = sdm845_sspp,
>>>>> +           .mixer_count = ARRAY_SIZE(sm8150_lm),
>>>>> +           .mixer = sm8150_lm,
>>>>> +           .pingpong_count = ARRAY_SIZE(sm8150_pp),
>>>>> +           .pingpong = sm8150_pp,
>>>>> +           .merge_3d_count = ARRAY_SIZE(sm8150_merge_3d),
>>>>> +           .merge_3d = sm8150_merge_3d,
>>>>> +           .intf_count = ARRAY_SIZE(sc8180x_intf),
>>>>> +           .intf = sc8180x_intf,
>>>>> +           .vbif_count = ARRAY_SIZE(sdm845_vbif),
>>>>> +           .vbif = sdm845_vbif,
>>>>> +           .reg_dma_count = 1,
>>>>> +           .dma_cfg = sm8150_regdma,
>>>>> +           .perf = sc8180x_perf_data,
>>>>> +           .mdss_irqs = IRQ_SC8180X_MASK,
>>>>> +   };
>>>>> +}
>>>>> +
>>>>>     /*
>>>>>      * sm8250_cfg_init(): populate sm8250 dpu sub-blocks reg offsets
>>>>>      * and instance counts.
>>>>> @@ -1260,6 +1388,7 @@ static const struct dpu_mdss_hw_cfg_handler cfg_handler[] = {
>>>>>      { .hw_rev = DPU_HW_VER_401, .cfg_init = sdm845_cfg_init},
>>>>>      { .hw_rev = DPU_HW_VER_500, .cfg_init = sm8150_cfg_init},
>>>>>      { .hw_rev = DPU_HW_VER_501, .cfg_init = sm8150_cfg_init},
>>>>> +   { .hw_rev = DPU_HW_VER_510, .cfg_init = sc8180x_cfg_init},
>>>>>      { .hw_rev = DPU_HW_VER_600, .cfg_init = sm8250_cfg_init},
>>>>>      { .hw_rev = DPU_HW_VER_620, .cfg_init = sc7180_cfg_init},
>>>>>      { .hw_rev = DPU_HW_VER_720, .cfg_init = sc7280_cfg_init},
>>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>>>>> index 31af04afda7d..9572d29ff2ff 100644
>>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>>>>> @@ -39,6 +39,7 @@
>>>>>     #define DPU_HW_VER_410   DPU_HW_VER(4, 1, 0) /* sdm670 v1.0 */
>>>>>     #define DPU_HW_VER_500   DPU_HW_VER(5, 0, 0) /* sm8150 v1.0 */
>>>>>     #define DPU_HW_VER_501   DPU_HW_VER(5, 0, 1) /* sm8150 v2.0 */
>>>>> +#define DPU_HW_VER_510     DPU_HW_VER(5, 1, 1) /* sc8180 */
>>>>>     #define DPU_HW_VER_600   DPU_HW_VER(6, 0, 0) /* sm8250 */
>>>>>     #define DPU_HW_VER_620   DPU_HW_VER(6, 2, 0) /* sc7180 v1.0 */
>>>>>     #define DPU_HW_VER_720   DPU_HW_VER(7, 2, 0) /* sc7280 */
>>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>>>> index 47fe11a84a77..cedc631f8498 100644
>>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>>>>> @@ -1351,6 +1351,7 @@ const struct of_device_id dpu_dt_match[] = {
>>>>>      { .compatible = "qcom,sdm845-dpu", },
>>>>>      { .compatible = "qcom,sc7180-dpu", },
>>>>>      { .compatible = "qcom,sc7280-dpu", },
>>>>> +   { .compatible = "qcom,sc8180x-dpu", },
>>>>>      { .compatible = "qcom,sm8150-dpu", },
>>>>>      { .compatible = "qcom,sm8250-dpu", },
>>>>>      {}
>>>>> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
>>>>> index 555666e3f960..0f441d358b60 100644
>>>>> --- a/drivers/gpu/drm/msm/msm_drv.c
>>>>> +++ b/drivers/gpu/drm/msm/msm_drv.c
>>>>> @@ -1438,6 +1438,7 @@ static const struct of_device_id dt_match[] = {
>>>>>      { .compatible = "qcom,sdm845-mdss", .data = (void *)KMS_DPU },
>>>>>      { .compatible = "qcom,sc7180-mdss", .data = (void *)KMS_DPU },
>>>>>      { .compatible = "qcom,sc7280-mdss", .data = (void *)KMS_DPU },
>>>>> +   { .compatible = "qcom,sc8180x-mdss", .data = (void *)KMS_DPU },
>>>>>      { .compatible = "qcom,sm8150-mdss", .data = (void *)KMS_DPU },
>>>>>      { .compatible = "qcom,sm8250-mdss", .data = (void *)KMS_DPU },
>>>>>      {}
> 
> 
>