From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: "Sankeerth Billakanti (QUIC)" <quic_sbillaka@quicinc.com>
Cc: "dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
"freedreno@lists.freedesktop.org"
<freedreno@lists.freedesktop.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"robdclark@gmail.com" <robdclark@gmail.com>,
"seanpaul@chromium.org" <seanpaul@chromium.org>,
"swboyd@chromium.org" <swboyd@chromium.org>,
quic_kalyant <quic_kalyant@quicinc.com>,
"Abhinav Kumar (QUIC)" <quic_abhinavk@quicinc.com>,
"dianders@chromium.org" <dianders@chromium.org>,
"Kuogee Hsieh (QUIC)" <quic_khsieh@quicinc.com>,
"bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>,
"sean@poorly.run" <sean@poorly.run>,
"airlied@linux.ie" <airlied@linux.ie>,
"daniel@ffwll.ch" <daniel@ffwll.ch>,
quic_vproddut <quic_vproddut@quicinc.com>,
"Aravind Venkateswaran (QUIC)" <quic_aravindh@quicinc.com>
Subject: Re: [PATCH v6 4/8] drm/msm/dp: avoid handling masked interrupts
Date: Thu, 31 Mar 2022 13:10:27 +0300 [thread overview]
Message-ID: <d9ac1cee-d4fc-09ae-b2df-82ae2ecd57fb@linaro.org> (raw)
In-Reply-To: <MW4PR02MB7186669BA1B19FA4F184B558E1E19@MW4PR02MB7186.namprd02.prod.outlook.com>
On 31/03/2022 08:53, Sankeerth Billakanti (QUIC) wrote:
> Hi Dmitry,
>
>> On Wed, 30 Mar 2022 at 19:03, Sankeerth Billakanti
>> <quic_sbillaka@quicinc.com> wrote:
>>>
>>> The interrupt register will still reflect the connect and disconnect
>>> interrupt status without generating an actual HW interrupt.
>>> The controller driver should not handle those masked interrupts.
>>>
>>> Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
>>> ---
>>> drivers/gpu/drm/msm/dp/dp_catalog.c | 5 +++--
>>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c
>>> b/drivers/gpu/drm/msm/dp/dp_catalog.c
>>> index 3c16f95..1809ce2 100644
>>> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
>>> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
>>> @@ -608,13 +608,14 @@ u32 dp_catalog_hpd_get_intr_status(struct
>>> dp_catalog *dp_catalog) {
>>> struct dp_catalog_private *catalog = container_of(dp_catalog,
>>> struct dp_catalog_private, dp_catalog);
>>> - int isr = 0;
>>> + int isr, mask;
>>>
>>> isr = dp_read_aux(catalog, REG_DP_DP_HPD_INT_STATUS);
>>> dp_write_aux(catalog, REG_DP_DP_HPD_INT_ACK,
>>> (isr & DP_DP_HPD_INT_MASK));
>>> + mask = dp_read_aux(catalog, REG_DP_DP_HPD_INT_MASK);
>>>
>>> - return isr;
>>> + return isr & (DP_DP_HPD_STATE_STATUS_MASK | mask);
>>
>> I suspect that the logic is inverted here. Shouldn't it be:
>>
>> return isr & DP_DP_HPD_STATE_STATUS_MASK & mask;
>>
>> ?
>>
>
> The value of DP_DP_HPD_STATE_STATUS_MASK is 0xE0000000 and the value of the read
> interrupt mask variable could be is 0xF.
>
> The mask value is indicated via the register, REG_DP_DP_HPD_INT_MASK, bits 3:0.
> The HPD status is indicated via a different read-only register REG_DP_DP_HPD_INT_STATUS, bits 31:29.
I see. Maybe the following expression would be better?
return isr & (mask & ~DP_DP_HPD_INT_MASK);
>
> isr & DP_DP_HPD_STATE_STATUS_MASK & mask, will return 0 always.
>
>>> }
>>>
>>> int dp_catalog_ctrl_get_interrupt(struct dp_catalog *dp_catalog)
>>> --
>>> 2.7.4
>>>
>>
>>
>> --
>> With best wishes
>> Dmitry
>
> Thank you,
> Sankeerth
--
With best wishes
Dmitry
next prev parent reply other threads:[~2022-03-31 10:10 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-30 16:02 [PATCH v6 0/8] Add support for the eDP panel over aux_bus Sankeerth Billakanti
2022-03-30 16:02 ` [PATCH v6 1/8] drm/msm/dp: Add eDP support via aux_bus Sankeerth Billakanti
2022-03-30 23:19 ` Dmitry Baryshkov
2022-03-31 0:33 ` Doug Anderson
2022-03-31 23:22 ` Doug Anderson
2022-04-02 10:37 ` Dmitry Baryshkov
2022-04-02 17:06 ` Doug Anderson
2022-04-02 20:26 ` Dmitry Baryshkov
2022-04-04 20:53 ` Doug Anderson
2022-04-05 12:53 ` Dmitry Baryshkov
2022-04-05 17:02 ` Doug Anderson
2022-04-05 17:36 ` Dmitry Baryshkov
2022-04-05 18:11 ` Doug Anderson
2022-04-07 14:19 ` Sankeerth Billakanti (QUIC)
2022-04-07 17:07 ` Doug Anderson
2022-04-07 20:11 ` Abhinav Kumar
2022-04-07 20:47 ` Doug Anderson
2022-04-07 22:03 ` Abhinav Kumar
2022-04-07 23:34 ` Doug Anderson
2022-04-07 23:46 ` Dmitry Baryshkov
2022-04-08 0:21 ` Doug Anderson
2022-04-08 12:19 ` Dmitry Baryshkov
2022-04-08 13:43 ` Doug Anderson
2022-04-08 14:58 ` Dmitry Baryshkov
2022-04-08 17:23 ` Abhinav Kumar
2022-04-07 23:35 ` Dmitry Baryshkov
2022-04-08 0:20 ` Doug Anderson
2022-04-08 12:13 ` Dmitry Baryshkov
2022-04-08 13:56 ` Doug Anderson
2022-04-08 14:17 ` Dmitry Baryshkov
2022-03-30 16:02 ` [PATCH v6 2/8] drm/msm/dp: wait for hpd high before aux transaction Sankeerth Billakanti
2022-03-31 23:22 ` Doug Anderson
2022-04-04 12:43 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 3/8] drm/msm/dp: Support only IRQ_HPD and REPLUG interrupts for eDP Sankeerth Billakanti
2022-03-31 23:22 ` Doug Anderson
2022-04-04 12:56 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 4/8] drm/msm/dp: avoid handling masked interrupts Sankeerth Billakanti
2022-03-30 22:16 ` Dmitry Baryshkov
2022-03-31 5:53 ` Sankeerth Billakanti (QUIC)
2022-03-31 10:10 ` Dmitry Baryshkov [this message]
2022-03-31 11:04 ` Sankeerth Billakanti
2022-03-31 11:06 ` Dmitry Baryshkov
2022-04-04 17:56 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 5/8] drm/msm/dp: prevent multiple votes for dp resources Sankeerth Billakanti
2022-03-31 23:23 ` Doug Anderson
2022-04-08 16:14 ` Dmitry Baryshkov
2022-04-08 17:12 ` Sankeerth Billakanti
2022-04-08 18:02 ` Dmitry Baryshkov
2022-03-30 16:02 ` [PATCH v6 6/8] drm/msm/dp: remove unnecessary delay during boot Sankeerth Billakanti
2022-03-31 23:23 ` Doug Anderson
2022-04-04 13:52 ` Sankeerth Billakanti (QUIC)
2022-04-04 21:13 ` Dmitry Baryshkov
2022-04-07 12:40 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 7/8] drm/msm/dp: Support edp/dp without hpd Sankeerth Billakanti
2022-03-31 23:23 ` Doug Anderson
2022-04-04 18:32 ` Sankeerth Billakanti (QUIC)
2022-04-04 21:15 ` Dmitry Baryshkov
2022-04-07 12:41 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 8/8] drm/msm/dp: Handle eDP mode_valid differently from dp Sankeerth Billakanti
2022-03-30 22:08 ` Dmitry Baryshkov
2022-03-31 6:02 ` Sankeerth Billakanti (QUIC)
2022-03-31 23:24 ` Doug Anderson
2022-04-04 18:20 ` Sankeerth Billakanti (QUIC)
2022-04-04 21:29 ` Dmitry Baryshkov
2022-04-07 14:05 ` Sankeerth Billakanti (QUIC)
2022-04-08 12:08 ` Dmitry Baryshkov
2022-04-08 15:50 ` Sankeerth Billakanti
2022-04-08 16:47 ` Dmitry Baryshkov
2022-04-08 17:38 ` Sankeerth Billakanti
2022-04-08 18:06 ` Dmitry Baryshkov
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