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Date: Fri, 4 Dec 2015 13:09:54 -0500
From: Alex Deucher <alexdeucher@...il.com>
To: Christian König <christian.koenig@....com>
Cc: Stephen Chandler Paul <cpaul@...hat.com>,
Alex Deucher <alexander.deucher@....com>,
David Airlie <airlied@...ux.ie>,
Maling list - DRI developers
<dri-devel@...ts.freedesktop.org>,
LKML <linux-kernel@...r.kernel.org>,
Jerome Glisse <jglisse@...hat.com>,
Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: Re: [PATCH v2] drm/radeon: Retry DDC probing on DVI on failure if we
got an HPD interrupt
On Fri, Dec 4, 2015 at 3:53 AM, Christian König
<christian.koenig@....com> wrote:
> On 04.12.2015 00:26, cpaul@...hat.com wrote:
>>
>> From: Lyude <cpaul@...hat.com>
>>
>> HPD signals on DVI ports can be fired off before the pins required for
>> DDC probing actually make contact, due to the pins for HPD making
>> contact first. This results in a HPD signal being asserted but DDC
>> probing failing, resulting in hotplugging occasionally failing.
>>
>> This is somewhat rare on most cards (depending on what angle you plug
>> the DVI connector in), but on some cards it happens constantly. The
>> Radeon R5 on the machine used for testing this patch for instance, runs
>> into this issue just about every time I try to hotplug a DVI monitor and
>> as a result hotplugging almost never works.
>>
>> Rescheduling the hotplug work for a second when we run into an HPD
>> signal with a failing DDC probe usually gives enough time for the rest
>> of the connector's pins to make contact, and fixes this issue.
>>
>> Signed-off-by: Lyude <cpaul@...hat.com>
>
>
> I find a second a bit long, but if it works so what?
>
> Looks sane enough to me, patch is Reviewed-by: Christian König
> <christian.koenig@....com>
Applied. thanks!
Alex
>
>
>> ---
>> Sending this version of the patch because Jerome says this will probably
>> be the
>> least controversial of the potential fixes. Instead of sending userspace
>> tons of
>> hotplug events, we just reschedule the hotplug work.
>>
>> drivers/gpu/drm/radeon/cik.c | 2 +-
>> drivers/gpu/drm/radeon/evergreen.c | 2 +-
>> drivers/gpu/drm/radeon/r100.c | 2 +-
>> drivers/gpu/drm/radeon/r600.c | 2 +-
>> drivers/gpu/drm/radeon/radeon.h | 2 +-
>> drivers/gpu/drm/radeon/radeon_connectors.c | 21 ++++++++++++++++++++-
>> drivers/gpu/drm/radeon/radeon_irq_kms.c | 8 ++++----
>> drivers/gpu/drm/radeon/radeon_mode.h | 1 +
>> drivers/gpu/drm/radeon/rs600.c | 2 +-
>> drivers/gpu/drm/radeon/si.c | 2 +-
>> 10 files changed, 32 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
>> index 248953d..6801a0c 100644
>> --- a/drivers/gpu/drm/radeon/cik.c
>> +++ b/drivers/gpu/drm/radeon/cik.c
>> @@ -8472,7 +8472,7 @@ restart_ih:
>> if (queue_dp)
>> schedule_work(&rdev->dp_work);
>> if (queue_hotplug)
>> - schedule_work(&rdev->hotplug_work);
>> + schedule_delayed_work(&rdev->hotplug_work, 0);
>> if (queue_reset) {
>> rdev->needs_reset = true;
>> wake_up_all(&rdev->fence_queue);
>> diff --git a/drivers/gpu/drm/radeon/evergreen.c
>> b/drivers/gpu/drm/radeon/evergreen.c
>> index 0acde19..f8e4986 100644
>> --- a/drivers/gpu/drm/radeon/evergreen.c
>> +++ b/drivers/gpu/drm/radeon/evergreen.c
>> @@ -5368,7 +5368,7 @@ restart_ih:
>> if (queue_dp)
>> schedule_work(&rdev->dp_work);
>> if (queue_hotplug)
>> - schedule_work(&rdev->hotplug_work);
>> + schedule_delayed_work(&rdev->hotplug_work, 0);
>> if (queue_hdmi)
>> schedule_work(&rdev->audio_work);
>> if (queue_thermal && rdev->pm.dpm_enabled)
>> diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
>> index 238b13f..2df3c86 100644
>> --- a/drivers/gpu/drm/radeon/r100.c
>> +++ b/drivers/gpu/drm/radeon/r100.c
>> @@ -806,7 +806,7 @@ int r100_irq_process(struct radeon_device *rdev)
>> status = r100_irq_ack(rdev);
>> }
>> if (queue_hotplug)
>> - schedule_work(&rdev->hotplug_work);
>> + schedule_delayed_work(&rdev->hotplug_work, 0);
>> if (rdev->msi_enabled) {
>> switch (rdev->family) {
>> case CHIP_RS400:
>> diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
>> index 4ea5b10..cc2fdf0 100644
>> --- a/drivers/gpu/drm/radeon/r600.c
>> +++ b/drivers/gpu/drm/radeon/r600.c
>> @@ -4276,7 +4276,7 @@ restart_ih:
>> WREG32(IH_RB_RPTR, rptr);
>> }
>> if (queue_hotplug)
>> - schedule_work(&rdev->hotplug_work);
>> + schedule_delayed_work(&rdev->hotplug_work, 0);
>> if (queue_hdmi)
>> schedule_work(&rdev->audio_work);
>> if (queue_thermal && rdev->pm.dpm_enabled)
>> diff --git a/drivers/gpu/drm/radeon/radeon.h
>> b/drivers/gpu/drm/radeon/radeon.h
>> index b6cbd81..87db649 100644
>> --- a/drivers/gpu/drm/radeon/radeon.h
>> +++ b/drivers/gpu/drm/radeon/radeon.h
>> @@ -2414,7 +2414,7 @@ struct radeon_device {
>> struct r600_ih ih; /* r6/700 interrupt ring */
>> struct radeon_rlc rlc;
>> struct radeon_mec mec;
>> - struct work_struct hotplug_work;
>> + struct delayed_work hotplug_work;
>> struct work_struct dp_work;
>> struct work_struct audio_work;
>> int num_crtc; /* number of crtcs */
>> diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c
>> b/drivers/gpu/drm/radeon/radeon_connectors.c
>> index 5a2cafb..340f3f5 100644
>> --- a/drivers/gpu/drm/radeon/radeon_connectors.c
>> +++ b/drivers/gpu/drm/radeon/radeon_connectors.c
>> @@ -1234,13 +1234,32 @@ radeon_dvi_detect(struct drm_connector *connector,
>> bool force)
>> if (r < 0)
>> return connector_status_disconnected;
>> + if (radeon_connector->detected_hpd_without_ddc) {
>> + force = true;
>> + radeon_connector->detected_hpd_without_ddc = false;
>> + }
>> +
>> if (!force && radeon_check_hpd_status_unchanged(connector)) {
>> ret = connector->status;
>> goto exit;
>> }
>> - if (radeon_connector->ddc_bus)
>> + if (radeon_connector->ddc_bus) {
>> dret = radeon_ddc_probe(radeon_connector, false);
>> +
>> + /* Sometimes the pins required for the DDC probe on DVI
>> + * connectors don't make contact at the same time that the
>> ones
>> + * for HPD do. If the DDC probe fails even though we had
>> an HPD
>> + * signal, try again later */
>> + if (!dret && !force &&
>> + connector->status != connector_status_connected) {
>> + DRM_DEBUG_KMS("hpd detected without ddc, retrying
>> in 1 second\n");
>> + radeon_connector->detected_hpd_without_ddc = true;
>> + schedule_delayed_work(&rdev->hotplug_work,
>> + msecs_to_jiffies(1000));
>> + goto exit;
>> + }
>> + }
>> if (dret) {
>> radeon_connector->detected_by_load = false;
>> radeon_connector_free_edid(connector);
>> diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c
>> b/drivers/gpu/drm/radeon/radeon_irq_kms.c
>> index 171d3e4..979f3bf 100644
>> --- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
>> +++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
>> @@ -74,7 +74,7 @@ irqreturn_t radeon_driver_irq_handler_kms(int irq, void
>> *arg)
>> static void radeon_hotplug_work_func(struct work_struct *work)
>> {
>> struct radeon_device *rdev = container_of(work, struct
>> radeon_device,
>> - hotplug_work);
>> + hotplug_work.work);
>> struct drm_device *dev = rdev->ddev;
>> struct drm_mode_config *mode_config = &dev->mode_config;
>> struct drm_connector *connector;
>> @@ -302,7 +302,7 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
>> }
>> }
>> - INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
>> + INIT_DELAYED_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
>> INIT_WORK(&rdev->dp_work, radeon_dp_work_func);
>> INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
>> @@ -310,7 +310,7 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
>> r = drm_irq_install(rdev->ddev, rdev->ddev->pdev->irq);
>> if (r) {
>> rdev->irq.installed = false;
>> - flush_work(&rdev->hotplug_work);
>> + flush_delayed_work(&rdev->hotplug_work);
>> return r;
>> }
>> @@ -333,7 +333,7 @@ void radeon_irq_kms_fini(struct radeon_device *rdev)
>> rdev->irq.installed = false;
>> if (rdev->msi_enabled)
>> pci_disable_msi(rdev->pdev);
>> - flush_work(&rdev->hotplug_work);
>> + flush_delayed_work(&rdev->hotplug_work);
>> }
>> }
>> diff --git a/drivers/gpu/drm/radeon/radeon_mode.h
>> b/drivers/gpu/drm/radeon/radeon_mode.h
>> index 457b026..0aeb3ee 100644
>> --- a/drivers/gpu/drm/radeon/radeon_mode.h
>> +++ b/drivers/gpu/drm/radeon/radeon_mode.h
>> @@ -553,6 +553,7 @@ struct radeon_connector {
>> void *con_priv;
>> bool dac_load_detect;
>> bool detected_by_load; /* if the connection status was determined
>> by load */
>> + bool detected_hpd_without_ddc; /* if an HPD signal was detected on
>> DVI, but ddc probing failed */
>> uint16_t connector_object_id;
>> struct radeon_hpd hpd;
>> struct radeon_router router;
>> diff --git a/drivers/gpu/drm/radeon/rs600.c
>> b/drivers/gpu/drm/radeon/rs600.c
>> index 97a9048..6244f4e 100644
>> --- a/drivers/gpu/drm/radeon/rs600.c
>> +++ b/drivers/gpu/drm/radeon/rs600.c
>> @@ -813,7 +813,7 @@ int rs600_irq_process(struct radeon_device *rdev)
>> status = rs600_irq_ack(rdev);
>> }
>> if (queue_hotplug)
>> - schedule_work(&rdev->hotplug_work);
>> + schedule_delayed_work(&rdev->hotplug_work, 0);
>> if (queue_hdmi)
>> schedule_work(&rdev->audio_work);
>> if (rdev->msi_enabled) {
>> diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
>> index 07037e3..fb1a7ec 100644
>> --- a/drivers/gpu/drm/radeon/si.c
>> +++ b/drivers/gpu/drm/radeon/si.c
>> @@ -6848,7 +6848,7 @@ restart_ih:
>> if (queue_dp)
>> schedule_work(&rdev->dp_work);
>> if (queue_hotplug)
>> - schedule_work(&rdev->hotplug_work);
>> + schedule_delayed_work(&rdev->hotplug_work, 0);
>> if (queue_thermal && rdev->pm.dpm_enabled)
>> schedule_work(&rdev->pm.dpm.thermal.work);
>> rdev->ih.rptr = rptr;
>
>
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> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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