linux-kernel - Re: [PATCH v2 2/2] drm/msm/dpu: Add SC8180x to hw catalog

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Date:   Tue, 15 Feb 2022 18:38:15 -0800
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] drm/msm/dpu: Add SC8180x to hw catalog



On 2/15/2022 6:14 PM, Bjorn Andersson wrote:
> On Tue 15 Feb 11:42 CST 2022, Abhinav Kumar 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@...omium.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@...omium.org>
>>>>> [bjorn: Reworked intf and irq definitions]
>>>>> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.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.
>>
> 
> That made me take a second look at the HPG, and sure enough INTF_5 on
> SC7280 is connected to a eDP/DP Combo PHY. We have the same setup in
> SC8280XP.
> 
> In SC8180X, INTF_5 is documented as being connected to a eDP (only) PHY,
> so perhaps it makes sense to do it there, but for the others its wrong.
> 

Here you are specifying the controller in the catalog. So independent of 
the PHY thats being used, shouldnt this remain INTF_eDP?

> Regards,
> Bjorn