linux-kernel - Re: [PATCH 2/2] drm/msm/dpu: Set input

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Message-ID: <4a1caaae-f0c1-47d2-a74f-8c17fc5da2bd@quicinc.com>
Date:   Wed, 13 Dec 2023 11:51:25 -0800
From:   Jessica Zhang <quic_jesszhan@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
CC:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        "Marijn Suijten" <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] drm/msm/dpu: Set input_sel bit for INTF



On 12/2/2023 11:54 AM, Dmitry Baryshkov wrote:
> On 01/12/2023 23:29, Abhinav Kumar wrote:
>>
>>
>> On 11/30/2023 11:36 PM, Dmitry Baryshkov wrote:
>>> On Fri, 1 Dec 2023 at 03:31, Jessica Zhang 
>>> <quic_jesszhan@...cinc.com> wrote:
>>>>
>>>> Set the input_sel bit for encoders as it was missed in the initial
>>>> implementation.
>>>>
>>>> Reported-by: Rob Clark <robdclark@...il.com>
>>>> Fixes: 91143873a05d ("drm/msm/dpu: Add MISR register support for 
>>>> interface")
>>>> Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/39
>>>> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
>>>> ---
>>>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 2 +-
>>>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c   | 2 +-
>>>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c | 7 ++++++-
>>>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h | 4 +++-
>>>>   4 files changed, 11 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c 
>>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>>>> index 3442cf65b86f..d0884997ecb7 100644
>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>>>> @@ -320,7 +320,7 @@ static u32 dpu_hw_intf_get_line_count(struct 
>>>> dpu_hw_intf *intf)
>>>>
>>>>   static void dpu_hw_intf_setup_misr(struct dpu_hw_intf *intf)
>>>>   {
>>>> -       dpu_hw_setup_misr(&intf->hw, INTF_MISR_CTRL);
>>>> +       dpu_hw_setup_misr(&intf->hw, INTF_MISR_CTRL, true);
>>>>   }
>>>>
>>>>   static int dpu_hw_intf_collect_misr(struct dpu_hw_intf *intf, u32 
>>>> *misr_value)
>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c 
>>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c
>>>> index f38473e68f79..77b14107c84a 100644
>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c
>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c
>>>> @@ -83,7 +83,7 @@ static void dpu_hw_lm_setup_border_color(struct 
>>>> dpu_hw_mixer *ctx,
>>>>
>>>>   static void dpu_hw_lm_setup_misr(struct dpu_hw_mixer *ctx)
>>>>   {
>>>> -       dpu_hw_setup_misr(&ctx->hw, LM_MISR_CTRL);
>>>> +       dpu_hw_setup_misr(&ctx->hw, LM_MISR_CTRL, false);
>>>>   }
>>>>
>>>>   static int dpu_hw_lm_collect_misr(struct dpu_hw_mixer *ctx, u32 
>>>> *misr_value)
>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c 
>>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c
>>>> index a8a0a4e76b94..f441df47fdde 100644
>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c
>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c
>>>> @@ -481,7 +481,8 @@ void _dpu_hw_setup_qos_lut(struct 
>>>> dpu_hw_blk_reg_map *c, u32 offset,
>>>>                        cfg->danger_safe_en ? 
>>>> QOS_QOS_CTRL_DANGER_SAFE_EN : 0);
>>>>   }
>>>>
>>>> -void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 
>>>> misr_ctrl_offset)
>>>> +void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 
>>>> misr_ctrl_offset,
>>>> +               bool set_input_sel)
>>>>   {
>>>>          u32 config = 0;
>>>>
>>>> @@ -491,6 +492,10 @@ void dpu_hw_setup_misr(struct 
>>>> dpu_hw_blk_reg_map *c, u32 misr_ctrl_offset)
>>>>          wmb();
>>>>
>>>>          config = MISR_FRAME_COUNT | MISR_CTRL_ENABLE | 
>>>> MISR_CTRL_FREE_RUN_MASK;
>>>> +
>>>> +       if (set_input_sel)
>>>> +               config |= MISR_CTRL_INPUT_SEL;
>>>> +
>>>>          DPU_REG_WRITE(c, misr_ctrl_offset, config);
>>>>   }
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h 
>>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h
>>>> index bb496ebe283b..793670d62414 100644
>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h
>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h
>>>> @@ -17,6 +17,7 @@
>>>>   #define MISR_CTRL_ENABLE                BIT(8)
>>>>   #define MISR_CTRL_STATUS                BIT(9)
>>>>   #define MISR_CTRL_STATUS_CLEAR          BIT(10)
>>>> +#define MISR_CTRL_INPUT_SEL             BIT(24)
>>>
>>> The public apq8916 TRM documents this as a 4-bit field. I think this
>>> was followed into the later generations. Can we please document it
>>> correctly and use an uint instead of just bool for set_input_sel?
>>>
>>
>> Can you pls point us to this document you are referring?
> 
> I have this link in my bookmarks, which doesn't seem to work no longer:
> 
> https://developer.qualcomm.com/download/sd410/snapdragon-410e-technical-reference-manual.pdf?referrer=node/29241
> 
> 96boards forum has several links and mentions of this doc.
> 
>>
>> I was not aware that bit level details are revealed in external 
>> documents :)
>>
>> Even though its a 4-bit field, it only takes a 0 or 1 as others are 
>> undefined.
>>
>> Exposing all the bits will only cause more confusion like it did for 
>> others thinking that input select is actually configurable when its not.
>>
>> I think what we should do is just pass "misr_type" to this API to tell 
>> whether its lm misr or intf misr and set BIT(24) based on that.
> 
> This would be another simplification. Can we instead just use values 0 
> and 1 instead and maybe document that by default everybody should use 0.

Hi Dmitry,

Acked. Will change the input_sel parameter to a u8 and add a note that 
it should be 0x0 by default with an exception for encoders.

Thanks,

Jessica Zhang

> 
>>
>>
>>>>   #define MISR_CTRL_FREE_RUN_MASK         BIT(31)
>>>>
>>>>   /*
>>>> @@ -357,7 +358,8 @@ void _dpu_hw_setup_qos_lut(struct 
>>>> dpu_hw_blk_reg_map *c, u32 offset,
>>>>                             bool qos_8lvl,
>>>>                             const struct dpu_hw_qos_cfg *cfg);
>>>>
>>>> -void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 
>>>> misr_ctrl_offset);
>>>> +void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 
>>>> misr_ctrl_offset,
>>>> +                      bool set_input_sel);
>>>>
>>>>   int dpu_hw_collect_misr(struct dpu_hw_blk_reg_map *c,
>>>>                  u32 misr_ctrl_offset,
>>>>
>>>> -- 
>>>> 2.43.0
>>>>
>>>
>>>
> 
> -- 
> With best wishes
> Dmitry
>