* [PATCH] drm/i915: disable IPS while getting the sink CRCs
@ 2015-05-25 21:52 Paulo Zanoni
2015-05-27 19:35 ` Rodrigo Vivi
0 siblings, 1 reply; 7+ messages in thread
From: Paulo Zanoni @ 2015-05-25 21:52 UTC (permalink / raw)
To: intel-gfx; +Cc: Paulo Zanoni, Rodrigo Vivi
From: Paulo Zanoni <paulo.r.zanoni@intel.com>
This commit is the "sink CRC" version of:
commit 8c740dcea254a1472df2c0ac5ac585412a2507ec
Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Fri Oct 17 18:42:03 2014 -0300
drm/i915: disable IPS while getting the pipe CRCs.
For some unknown reason, when IPS gets enabled, the sink CRC changes.
Since hsw_enable_ips() doesn't really guarantee to enable IPS (it
depends on package C-states), we can't really predict if IPS is
enabled or disabled while running our CRC tests, so let's just
completely disable IPS while sink CRCs are being used.
If we find a way to make IPS not change the pipe CRC result, we may
want to fix IPS and then revert this patch (and 8c740dcea too). While
this doesn't happen, let's merge this patch, so the IGT tests relying
on sink CRCs can work properly.
This was discovered while developing a new IGT test, which will
probably be called kms_frontbuffer_tracking.
Testcase: igt/kms_frontbuffer_tracking (not on upstream IGT yet)
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++-------------
1 file changed, 45 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index abd442a..62662de 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4041,46 +4041,70 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc)
u8 buf;
int test_crc_count;
int attempts = 6;
+ int ret = 0;
- if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0)
- return -EIO;
+ hsw_disable_ips(intel_crtc);
- if (!(buf & DP_TEST_CRC_SUPPORTED))
- return -ENOTTY;
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) {
+ ret = -EIO;
+ goto out;
+ }
+
+ if (!(buf & DP_TEST_CRC_SUPPORTED)) {
+ ret = -ENOTTY;
+ goto out;
+ }
- if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0)
- return -EIO;
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) {
+ ret = -EIO;
+ goto out;
+ }
if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
- buf | DP_TEST_SINK_START) < 0)
- return -EIO;
+ buf | DP_TEST_SINK_START) < 0) {
+ ret = -EIO;
+ goto out;
+ }
+
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) {
+ ret = -EIO;
+ goto out;
+ }
- if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0)
- return -EIO;
test_crc_count = buf & DP_TEST_COUNT_MASK;
do {
if (drm_dp_dpcd_readb(&intel_dp->aux,
- DP_TEST_SINK_MISC, &buf) < 0)
- return -EIO;
+ DP_TEST_SINK_MISC, &buf) < 0) {
+ ret = -EIO;
+ goto out;
+ }
intel_wait_for_vblank(dev, intel_crtc->pipe);
} while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count);
if (attempts == 0) {
DRM_DEBUG_KMS("Panel is unable to calculate CRC after 6 vblanks\n");
- return -ETIMEDOUT;
+ ret = -ETIMEDOUT;
+ goto out;
}
- if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0)
- return -EIO;
+ if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) {
+ ret = -EIO;
+ goto out;
+ }
- if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0)
- return -EIO;
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) {
+ ret = -EIO;
+ goto out;
+ }
if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
- buf & ~DP_TEST_SINK_START) < 0)
- return -EIO;
-
- return 0;
+ buf & ~DP_TEST_SINK_START) < 0) {
+ ret = -EIO;
+ goto out;
+ }
+out:
+ hsw_enable_ips(intel_crtc);
+ return ret;
}
static bool
--
2.1.4
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH] drm/i915: disable IPS while getting the sink CRCs 2015-05-25 21:52 [PATCH] drm/i915: disable IPS while getting the sink CRCs Paulo Zanoni @ 2015-05-27 19:35 ` Rodrigo Vivi 2015-05-27 19:42 ` Paulo Zanoni 0 siblings, 1 reply; 7+ messages in thread From: Rodrigo Vivi @ 2015-05-27 19:35 UTC (permalink / raw) To: Paulo Zanoni; +Cc: intel-gfx, Paulo Zanoni, Rodrigo Vivi I didn't face this since I was letting IPS disabled on my tests here and the platforms that I'm mostly concerned about sink CRC not working well are the ones that doesn't have IPS. I'm not sure this is the right way to solve this issue. Maybe we want to know the sink CRC when IPS is on. I believe the right approach is to provide a sysfs interface to toggle ips off so testcase can disabled ips to not get impacted by it when reading sink CRC. and than, enable it back if it was enabled after test is concluded. But anyway, this is a simple solution that we have right now and we can change it once we have the sysfs interface, so: Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> On Mon, May 25, 2015 at 2:52 PM, Paulo Zanoni <przanoni@gmail.com> wrote: > From: Paulo Zanoni <paulo.r.zanoni@intel.com> > > This commit is the "sink CRC" version of: > > commit 8c740dcea254a1472df2c0ac5ac585412a2507ec > Author: Paulo Zanoni <paulo.r.zanoni@intel.com> > Date: Fri Oct 17 18:42:03 2014 -0300 > drm/i915: disable IPS while getting the pipe CRCs. > > For some unknown reason, when IPS gets enabled, the sink CRC changes. > Since hsw_enable_ips() doesn't really guarantee to enable IPS (it > depends on package C-states), we can't really predict if IPS is > enabled or disabled while running our CRC tests, so let's just > completely disable IPS while sink CRCs are being used. > > If we find a way to make IPS not change the pipe CRC result, we may > want to fix IPS and then revert this patch (and 8c740dcea too). While > this doesn't happen, let's merge this patch, so the IGT tests relying > on sink CRCs can work properly. > > This was discovered while developing a new IGT test, which will > probably be called kms_frontbuffer_tracking. > > Testcase: igt/kms_frontbuffer_tracking (not on upstream IGT yet) > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> > Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> > --- > drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++------------- > 1 file changed, 45 insertions(+), 21 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c > index abd442a..62662de 100644 > --- a/drivers/gpu/drm/i915/intel_dp.c > +++ b/drivers/gpu/drm/i915/intel_dp.c > @@ -4041,46 +4041,70 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) > u8 buf; > int test_crc_count; > int attempts = 6; > + int ret = 0; > > - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) > - return -EIO; > + hsw_disable_ips(intel_crtc); > > - if (!(buf & DP_TEST_CRC_SUPPORTED)) > - return -ENOTTY; > + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { > + ret = -EIO; > + goto out; > + } > + > + if (!(buf & DP_TEST_CRC_SUPPORTED)) { > + ret = -ENOTTY; > + goto out; > + } > > - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) > - return -EIO; > + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { > + ret = -EIO; > + goto out; > + } > > if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, > - buf | DP_TEST_SINK_START) < 0) > - return -EIO; > + buf | DP_TEST_SINK_START) < 0) { > + ret = -EIO; > + goto out; > + } > + > + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { > + ret = -EIO; > + goto out; > + } > > - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) > - return -EIO; > test_crc_count = buf & DP_TEST_COUNT_MASK; > > do { > if (drm_dp_dpcd_readb(&intel_dp->aux, > - DP_TEST_SINK_MISC, &buf) < 0) > - return -EIO; > + DP_TEST_SINK_MISC, &buf) < 0) { > + ret = -EIO; > + goto out; > + } > intel_wait_for_vblank(dev, intel_crtc->pipe); > } while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count); > > if (attempts == 0) { > DRM_DEBUG_KMS("Panel is unable to calculate CRC after 6 vblanks\n"); > - return -ETIMEDOUT; > + ret = -ETIMEDOUT; > + goto out; > } > > - if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) > - return -EIO; > + if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) { > + ret = -EIO; > + goto out; > + } > > - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) > - return -EIO; > + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { > + ret = -EIO; > + goto out; > + } > if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, > - buf & ~DP_TEST_SINK_START) < 0) > - return -EIO; > - > - return 0; > + buf & ~DP_TEST_SINK_START) < 0) { > + ret = -EIO; > + goto out; > + } > +out: > + hsw_enable_ips(intel_crtc); > + return ret; > } > > static bool > -- > 2.1.4 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Rodrigo Vivi Blog: http://blog.vivi.eng.br _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/i915: disable IPS while getting the sink CRCs 2015-05-27 19:35 ` Rodrigo Vivi @ 2015-05-27 19:42 ` Paulo Zanoni 2015-05-27 20:06 ` Rodrigo Vivi 2015-05-28 8:05 ` Daniel Vetter 0 siblings, 2 replies; 7+ messages in thread From: Paulo Zanoni @ 2015-05-27 19:42 UTC (permalink / raw) To: Rodrigo Vivi; +Cc: intel-gfx, Paulo Zanoni, Rodrigo Vivi 2015-05-27 16:35 GMT-03:00 Rodrigo Vivi <rodrigo.vivi@gmail.com>: > I didn't face this since I was letting IPS disabled on my tests here > and the platforms that I'm mostly concerned about sink CRC not working > well are the ones that doesn't have IPS. > > I'm not sure this is the right way to solve this issue. Maybe we want > to know the sink CRC when IPS is on. > I believe the right approach is to provide a sysfs interface to toggle > ips off so testcase can disabled ips to not get impacted by it when > reading sink CRC. and than, enable it back if it was enabled after > test is concluded. > > But anyway, this is a simple solution that we have right now and we > can change it once we have the sysfs interface, so: > Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> We do have the sysfs interface: echo 0 > /sys/module/i915/parameters/enable_ips I think we should have consistency between both source and sink CRCs. So if we decide to go for the sysfs solution we need to revert the "disable IPS while getting the source CRCs" patch and then fix IGT so it always disables IPS for all CRC tests. I prefer the Kernel solution since IMHO it is much simpler and makes sure IGT is always correct, but if we decide to go for the sysfs solution I can write the patches. I guess a third (and fourth and fifth) opinion from someone else here would help. Anybody? > > > > On Mon, May 25, 2015 at 2:52 PM, Paulo Zanoni <przanoni@gmail.com> wrote: >> From: Paulo Zanoni <paulo.r.zanoni@intel.com> >> >> This commit is the "sink CRC" version of: >> >> commit 8c740dcea254a1472df2c0ac5ac585412a2507ec >> Author: Paulo Zanoni <paulo.r.zanoni@intel.com> >> Date: Fri Oct 17 18:42:03 2014 -0300 >> drm/i915: disable IPS while getting the pipe CRCs. >> >> For some unknown reason, when IPS gets enabled, the sink CRC changes. >> Since hsw_enable_ips() doesn't really guarantee to enable IPS (it >> depends on package C-states), we can't really predict if IPS is >> enabled or disabled while running our CRC tests, so let's just >> completely disable IPS while sink CRCs are being used. >> >> If we find a way to make IPS not change the pipe CRC result, we may >> want to fix IPS and then revert this patch (and 8c740dcea too). While >> this doesn't happen, let's merge this patch, so the IGT tests relying >> on sink CRCs can work properly. >> >> This was discovered while developing a new IGT test, which will >> probably be called kms_frontbuffer_tracking. >> >> Testcase: igt/kms_frontbuffer_tracking (not on upstream IGT yet) >> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> >> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> >> --- >> drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++------------- >> 1 file changed, 45 insertions(+), 21 deletions(-) >> >> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c >> index abd442a..62662de 100644 >> --- a/drivers/gpu/drm/i915/intel_dp.c >> +++ b/drivers/gpu/drm/i915/intel_dp.c >> @@ -4041,46 +4041,70 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) >> u8 buf; >> int test_crc_count; >> int attempts = 6; >> + int ret = 0; >> >> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) >> - return -EIO; >> + hsw_disable_ips(intel_crtc); >> >> - if (!(buf & DP_TEST_CRC_SUPPORTED)) >> - return -ENOTTY; >> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { >> + ret = -EIO; >> + goto out; >> + } >> + >> + if (!(buf & DP_TEST_CRC_SUPPORTED)) { >> + ret = -ENOTTY; >> + goto out; >> + } >> >> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) >> - return -EIO; >> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { >> + ret = -EIO; >> + goto out; >> + } >> >> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, >> - buf | DP_TEST_SINK_START) < 0) >> - return -EIO; >> + buf | DP_TEST_SINK_START) < 0) { >> + ret = -EIO; >> + goto out; >> + } >> + >> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { >> + ret = -EIO; >> + goto out; >> + } >> >> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) >> - return -EIO; >> test_crc_count = buf & DP_TEST_COUNT_MASK; >> >> do { >> if (drm_dp_dpcd_readb(&intel_dp->aux, >> - DP_TEST_SINK_MISC, &buf) < 0) >> - return -EIO; >> + DP_TEST_SINK_MISC, &buf) < 0) { >> + ret = -EIO; >> + goto out; >> + } >> intel_wait_for_vblank(dev, intel_crtc->pipe); >> } while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count); >> >> if (attempts == 0) { >> DRM_DEBUG_KMS("Panel is unable to calculate CRC after 6 vblanks\n"); >> - return -ETIMEDOUT; >> + ret = -ETIMEDOUT; >> + goto out; >> } >> >> - if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) >> - return -EIO; >> + if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) { >> + ret = -EIO; >> + goto out; >> + } >> >> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) >> - return -EIO; >> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { >> + ret = -EIO; >> + goto out; >> + } >> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, >> - buf & ~DP_TEST_SINK_START) < 0) >> - return -EIO; >> - >> - return 0; >> + buf & ~DP_TEST_SINK_START) < 0) { >> + ret = -EIO; >> + goto out; >> + } >> +out: >> + hsw_enable_ips(intel_crtc); >> + return ret; >> } >> >> static bool >> -- >> 2.1.4 >> >> _______________________________________________ >> Intel-gfx mailing list >> Intel-gfx@lists.freedesktop.org >> http://lists.freedesktop.org/mailman/listinfo/intel-gfx > > > > -- > Rodrigo Vivi > Blog: http://blog.vivi.eng.br -- Paulo Zanoni _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/i915: disable IPS while getting the sink CRCs 2015-05-27 19:42 ` Paulo Zanoni @ 2015-05-27 20:06 ` Rodrigo Vivi 2015-05-27 20:14 ` Paulo Zanoni 2015-05-28 8:05 ` Daniel Vetter 1 sibling, 1 reply; 7+ messages in thread From: Rodrigo Vivi @ 2015-05-27 20:06 UTC (permalink / raw) To: Paulo Zanoni; +Cc: intel-gfx, Paulo Zanoni, Rodrigo Vivi On Wed, May 27, 2015 at 12:42 PM, Paulo Zanoni <przanoni@gmail.com> wrote: > 2015-05-27 16:35 GMT-03:00 Rodrigo Vivi <rodrigo.vivi@gmail.com>: >> I didn't face this since I was letting IPS disabled on my tests here >> and the platforms that I'm mostly concerned about sink CRC not working >> well are the ones that doesn't have IPS. >> >> I'm not sure this is the right way to solve this issue. Maybe we want >> to know the sink CRC when IPS is on. >> I believe the right approach is to provide a sysfs interface to toggle >> ips off so testcase can disabled ips to not get impacted by it when >> reading sink CRC. and than, enable it back if it was enabled after >> test is concluded. >> >> But anyway, this is a simple solution that we have right now and we >> can change it once we have the sysfs interface, so: >> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> > > We do have the sysfs interface: > echo 0 > /sys/module/i915/parameters/enable_ips I believe the parameter is not enough. It prevents to get enabled next time, but didn't disable ips immediately. > I think we should have consistency between both source and sink CRCs. I'm not sure actually... We do need consistency of what is going through the pipe and being showed, but not necessarily on the usability. If IPS is impacting sink CRC it is actually impacting what is being displayed and we might be interested to know the differences... > So if we decide to go for the sysfs solution we need to revert the > "disable IPS while getting the source CRCs" patch and then fix IGT so > it always disables IPS for all CRC tests. > > I prefer the Kernel solution since IMHO it is much simpler and makes > sure IGT is always correct, but if we decide to go for the sysfs > solution I can write the patches. I guess a third (and fourth and > fifth) opinion from someone else here would help. Anybody? I was going to write here that I was ok with the kernel solution while we aren't actually interested on this ips usecase with sink CRC, but what if this disable ips force HW to exit PSR with HW tracking? We would never be really testing our PSR SW tracking corner cases with sink CRC. > >> >> >> >> On Mon, May 25, 2015 at 2:52 PM, Paulo Zanoni <przanoni@gmail.com> wrote: >>> From: Paulo Zanoni <paulo.r.zanoni@intel.com> >>> >>> This commit is the "sink CRC" version of: >>> >>> commit 8c740dcea254a1472df2c0ac5ac585412a2507ec >>> Author: Paulo Zanoni <paulo.r.zanoni@intel.com> >>> Date: Fri Oct 17 18:42:03 2014 -0300 >>> drm/i915: disable IPS while getting the pipe CRCs. >>> >>> For some unknown reason, when IPS gets enabled, the sink CRC changes. >>> Since hsw_enable_ips() doesn't really guarantee to enable IPS (it >>> depends on package C-states), we can't really predict if IPS is >>> enabled or disabled while running our CRC tests, so let's just >>> completely disable IPS while sink CRCs are being used. >>> >>> If we find a way to make IPS not change the pipe CRC result, we may >>> want to fix IPS and then revert this patch (and 8c740dcea too). While >>> this doesn't happen, let's merge this patch, so the IGT tests relying >>> on sink CRCs can work properly. >>> >>> This was discovered while developing a new IGT test, which will >>> probably be called kms_frontbuffer_tracking. >>> >>> Testcase: igt/kms_frontbuffer_tracking (not on upstream IGT yet) >>> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> >>> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> >>> --- >>> drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++------------- >>> 1 file changed, 45 insertions(+), 21 deletions(-) >>> >>> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c >>> index abd442a..62662de 100644 >>> --- a/drivers/gpu/drm/i915/intel_dp.c >>> +++ b/drivers/gpu/drm/i915/intel_dp.c >>> @@ -4041,46 +4041,70 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) >>> u8 buf; >>> int test_crc_count; >>> int attempts = 6; >>> + int ret = 0; >>> >>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) >>> - return -EIO; >>> + hsw_disable_ips(intel_crtc); >>> >>> - if (!(buf & DP_TEST_CRC_SUPPORTED)) >>> - return -ENOTTY; >>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { >>> + ret = -EIO; >>> + goto out; >>> + } >>> + >>> + if (!(buf & DP_TEST_CRC_SUPPORTED)) { >>> + ret = -ENOTTY; >>> + goto out; >>> + } >>> >>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) >>> - return -EIO; >>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { >>> + ret = -EIO; >>> + goto out; >>> + } >>> >>> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, >>> - buf | DP_TEST_SINK_START) < 0) >>> - return -EIO; >>> + buf | DP_TEST_SINK_START) < 0) { >>> + ret = -EIO; >>> + goto out; >>> + } >>> + >>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { >>> + ret = -EIO; >>> + goto out; >>> + } >>> >>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) >>> - return -EIO; >>> test_crc_count = buf & DP_TEST_COUNT_MASK; >>> >>> do { >>> if (drm_dp_dpcd_readb(&intel_dp->aux, >>> - DP_TEST_SINK_MISC, &buf) < 0) >>> - return -EIO; >>> + DP_TEST_SINK_MISC, &buf) < 0) { >>> + ret = -EIO; >>> + goto out; >>> + } >>> intel_wait_for_vblank(dev, intel_crtc->pipe); >>> } while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count); >>> >>> if (attempts == 0) { >>> DRM_DEBUG_KMS("Panel is unable to calculate CRC after 6 vblanks\n"); >>> - return -ETIMEDOUT; >>> + ret = -ETIMEDOUT; >>> + goto out; >>> } >>> >>> - if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) >>> - return -EIO; >>> + if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) { >>> + ret = -EIO; >>> + goto out; >>> + } >>> >>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) >>> - return -EIO; >>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { >>> + ret = -EIO; >>> + goto out; >>> + } >>> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, >>> - buf & ~DP_TEST_SINK_START) < 0) >>> - return -EIO; >>> - >>> - return 0; >>> + buf & ~DP_TEST_SINK_START) < 0) { >>> + ret = -EIO; >>> + goto out; >>> + } >>> +out: >>> + hsw_enable_ips(intel_crtc); >>> + return ret; >>> } >>> >>> static bool >>> -- >>> 2.1.4 >>> >>> _______________________________________________ >>> Intel-gfx mailing list >>> Intel-gfx@lists.freedesktop.org >>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx >> >> >> >> -- >> Rodrigo Vivi >> Blog: http://blog.vivi.eng.br > > > > -- > Paulo Zanoni -- Rodrigo Vivi Blog: http://blog.vivi.eng.br _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/i915: disable IPS while getting the sink CRCs 2015-05-27 20:06 ` Rodrigo Vivi @ 2015-05-27 20:14 ` Paulo Zanoni 2015-05-27 20:25 ` Rodrigo Vivi 0 siblings, 1 reply; 7+ messages in thread From: Paulo Zanoni @ 2015-05-27 20:14 UTC (permalink / raw) To: Rodrigo Vivi; +Cc: intel-gfx, Paulo Zanoni, Rodrigo Vivi 2015-05-27 17:06 GMT-03:00 Rodrigo Vivi <rodrigo.vivi@gmail.com>: > On Wed, May 27, 2015 at 12:42 PM, Paulo Zanoni <przanoni@gmail.com> wrote: >> 2015-05-27 16:35 GMT-03:00 Rodrigo Vivi <rodrigo.vivi@gmail.com>: >>> I didn't face this since I was letting IPS disabled on my tests here >>> and the platforms that I'm mostly concerned about sink CRC not working >>> well are the ones that doesn't have IPS. >>> >>> I'm not sure this is the right way to solve this issue. Maybe we want >>> to know the sink CRC when IPS is on. >>> I believe the right approach is to provide a sysfs interface to toggle >>> ips off so testcase can disabled ips to not get impacted by it when >>> reading sink CRC. and than, enable it back if it was enabled after >>> test is concluded. >>> >>> But anyway, this is a simple solution that we have right now and we >>> can change it once we have the sysfs interface, so: >>> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> >> >> We do have the sysfs interface: >> echo 0 > /sys/module/i915/parameters/enable_ips > > I believe the parameter is not enough. It prevents to get enabled next > time, but didn't disable ips immediately. Unset all modes, change parameter, do modeset. This was my first solution, and it worked. I'm also using the same approach for FBC and PSR at kms_frontbuffer_tracking. > >> I think we should have consistency between both source and sink CRCs. > > I'm not sure actually... We do need consistency of what is going > through the pipe and being showed, but not necessarily on the > usability. > If IPS is impacting sink CRC it is actually impacting what is being > displayed and we might be interested to know the differences... I agree we should probably debug this, since, somehow, some pixels are different. Any suggestions on how to debug this? > >> So if we decide to go for the sysfs solution we need to revert the >> "disable IPS while getting the source CRCs" patch and then fix IGT so >> it always disables IPS for all CRC tests. >> >> I prefer the Kernel solution since IMHO it is much simpler and makes >> sure IGT is always correct, but if we decide to go for the sysfs >> solution I can write the patches. I guess a third (and fourth and >> fifth) opinion from someone else here would help. Anybody? > > I was going to write here that I was ok with the kernel solution while > we aren't actually interested on this ips usecase with sink CRC, but > what if this disable ips force HW to exit PSR with HW tracking? If the debugfs information shows that PSR is enabled, then it should be enabled, right? My testcase is relying on this. > We > would never be really testing our PSR SW tracking corner cases with > sink CRC. kms_frontbuffer_tracking checks the pipe CRC, the sink CRC and the debufgs information > >> >>> >>> >>> >>> On Mon, May 25, 2015 at 2:52 PM, Paulo Zanoni <przanoni@gmail.com> wrote: >>>> From: Paulo Zanoni <paulo.r.zanoni@intel.com> >>>> >>>> This commit is the "sink CRC" version of: >>>> >>>> commit 8c740dcea254a1472df2c0ac5ac585412a2507ec >>>> Author: Paulo Zanoni <paulo.r.zanoni@intel.com> >>>> Date: Fri Oct 17 18:42:03 2014 -0300 >>>> drm/i915: disable IPS while getting the pipe CRCs. >>>> >>>> For some unknown reason, when IPS gets enabled, the sink CRC changes. >>>> Since hsw_enable_ips() doesn't really guarantee to enable IPS (it >>>> depends on package C-states), we can't really predict if IPS is >>>> enabled or disabled while running our CRC tests, so let's just >>>> completely disable IPS while sink CRCs are being used. >>>> >>>> If we find a way to make IPS not change the pipe CRC result, we may >>>> want to fix IPS and then revert this patch (and 8c740dcea too). While >>>> this doesn't happen, let's merge this patch, so the IGT tests relying >>>> on sink CRCs can work properly. >>>> >>>> This was discovered while developing a new IGT test, which will >>>> probably be called kms_frontbuffer_tracking. >>>> >>>> Testcase: igt/kms_frontbuffer_tracking (not on upstream IGT yet) >>>> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> >>>> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> >>>> --- >>>> drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++------------- >>>> 1 file changed, 45 insertions(+), 21 deletions(-) >>>> >>>> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c >>>> index abd442a..62662de 100644 >>>> --- a/drivers/gpu/drm/i915/intel_dp.c >>>> +++ b/drivers/gpu/drm/i915/intel_dp.c >>>> @@ -4041,46 +4041,70 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) >>>> u8 buf; >>>> int test_crc_count; >>>> int attempts = 6; >>>> + int ret = 0; >>>> >>>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) >>>> - return -EIO; >>>> + hsw_disable_ips(intel_crtc); >>>> >>>> - if (!(buf & DP_TEST_CRC_SUPPORTED)) >>>> - return -ENOTTY; >>>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { >>>> + ret = -EIO; >>>> + goto out; >>>> + } >>>> + >>>> + if (!(buf & DP_TEST_CRC_SUPPORTED)) { >>>> + ret = -ENOTTY; >>>> + goto out; >>>> + } >>>> >>>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) >>>> - return -EIO; >>>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { >>>> + ret = -EIO; >>>> + goto out; >>>> + } >>>> >>>> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, >>>> - buf | DP_TEST_SINK_START) < 0) >>>> - return -EIO; >>>> + buf | DP_TEST_SINK_START) < 0) { >>>> + ret = -EIO; >>>> + goto out; >>>> + } >>>> + >>>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { >>>> + ret = -EIO; >>>> + goto out; >>>> + } >>>> >>>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) >>>> - return -EIO; >>>> test_crc_count = buf & DP_TEST_COUNT_MASK; >>>> >>>> do { >>>> if (drm_dp_dpcd_readb(&intel_dp->aux, >>>> - DP_TEST_SINK_MISC, &buf) < 0) >>>> - return -EIO; >>>> + DP_TEST_SINK_MISC, &buf) < 0) { >>>> + ret = -EIO; >>>> + goto out; >>>> + } >>>> intel_wait_for_vblank(dev, intel_crtc->pipe); >>>> } while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count); >>>> >>>> if (attempts == 0) { >>>> DRM_DEBUG_KMS("Panel is unable to calculate CRC after 6 vblanks\n"); >>>> - return -ETIMEDOUT; >>>> + ret = -ETIMEDOUT; >>>> + goto out; >>>> } >>>> >>>> - if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) >>>> - return -EIO; >>>> + if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) { >>>> + ret = -EIO; >>>> + goto out; >>>> + } >>>> >>>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) >>>> - return -EIO; >>>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { >>>> + ret = -EIO; >>>> + goto out; >>>> + } >>>> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, >>>> - buf & ~DP_TEST_SINK_START) < 0) >>>> - return -EIO; >>>> - >>>> - return 0; >>>> + buf & ~DP_TEST_SINK_START) < 0) { >>>> + ret = -EIO; >>>> + goto out; >>>> + } >>>> +out: >>>> + hsw_enable_ips(intel_crtc); >>>> + return ret; >>>> } >>>> >>>> static bool >>>> -- >>>> 2.1.4 >>>> >>>> _______________________________________________ >>>> Intel-gfx mailing list >>>> Intel-gfx@lists.freedesktop.org >>>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx >>> >>> >>> >>> -- >>> Rodrigo Vivi >>> Blog: http://blog.vivi.eng.br >> >> >> >> -- >> Paulo Zanoni > > > > -- > Rodrigo Vivi > Blog: http://blog.vivi.eng.br -- Paulo Zanoni _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/i915: disable IPS while getting the sink CRCs 2015-05-27 20:14 ` Paulo Zanoni @ 2015-05-27 20:25 ` Rodrigo Vivi 0 siblings, 0 replies; 7+ messages in thread From: Rodrigo Vivi @ 2015-05-27 20:25 UTC (permalink / raw) To: Paulo Zanoni; +Cc: intel-gfx, Paulo Zanoni, Rodrigo Vivi On Wed, May 27, 2015 at 1:14 PM, Paulo Zanoni <przanoni@gmail.com> wrote: > 2015-05-27 17:06 GMT-03:00 Rodrigo Vivi <rodrigo.vivi@gmail.com>: >> On Wed, May 27, 2015 at 12:42 PM, Paulo Zanoni <przanoni@gmail.com> wrote: >>> 2015-05-27 16:35 GMT-03:00 Rodrigo Vivi <rodrigo.vivi@gmail.com>: >>>> I didn't face this since I was letting IPS disabled on my tests here >>>> and the platforms that I'm mostly concerned about sink CRC not working >>>> well are the ones that doesn't have IPS. >>>> >>>> I'm not sure this is the right way to solve this issue. Maybe we want >>>> to know the sink CRC when IPS is on. >>>> I believe the right approach is to provide a sysfs interface to toggle >>>> ips off so testcase can disabled ips to not get impacted by it when >>>> reading sink CRC. and than, enable it back if it was enabled after >>>> test is concluded. >>>> >>>> But anyway, this is a simple solution that we have right now and we >>>> can change it once we have the sysfs interface, so: >>>> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> >>> >>> We do have the sysfs interface: >>> echo 0 > /sys/module/i915/parameters/enable_ips >> >> I believe the parameter is not enough. It prevents to get enabled next >> time, but didn't disable ips immediately. > > Unset all modes, change parameter, do modeset. This was my first > solution, and it worked. I'm also using the same approach for FBC and > PSR at kms_frontbuffer_tracking. oh indeed... this works on test case... I was thinking about something more generic and immediate to be used anywhere... but this is a another discussion for later ;) > >> >>> I think we should have consistency between both source and sink CRCs. >> >> I'm not sure actually... We do need consistency of what is going >> through the pipe and being showed, but not necessarily on the >> usability. >> If IPS is impacting sink CRC it is actually impacting what is being >> displayed and we might be interested to know the differences... > > I agree we should probably debug this, since, somehow, some pixels are > different. Any suggestions on how to debug this? no idea, sorry :( > >> >>> So if we decide to go for the sysfs solution we need to revert the >>> "disable IPS while getting the source CRCs" patch and then fix IGT so >>> it always disables IPS for all CRC tests. >>> >>> I prefer the Kernel solution since IMHO it is much simpler and makes >>> sure IGT is always correct, but if we decide to go for the sysfs >>> solution I can write the patches. I guess a third (and fourth and >>> fifth) opinion from someone else here would help. Anybody? >> >> I was going to write here that I was ok with the kernel solution while >> we aren't actually interested on this ips usecase with sink CRC, but >> what if this disable ips force HW to exit PSR with HW tracking? > > If the debugfs information shows that PSR is enabled, then it should > be enabled, right? My testcase is relying on this. Yes, it is. But the HW and frontbuffer tracking can be triggering PSR exit that forces RFB update. Our testcases intend to cover all cases to see if our frontbuffer tracking is working correctly, but what if IPS disable makes HW trigger PSR exit by itself. You would never be testing the frontbuffer tracking actually... > >> We >> would never be really testing our PSR SW tracking corner cases with >> sink CRC. > > kms_frontbuffer_tracking checks the pipe CRC, the sink CRC and the > debufgs information > >> >>> >>>> >>>> >>>> >>>> On Mon, May 25, 2015 at 2:52 PM, Paulo Zanoni <przanoni@gmail.com> wrote: >>>>> From: Paulo Zanoni <paulo.r.zanoni@intel.com> >>>>> >>>>> This commit is the "sink CRC" version of: >>>>> >>>>> commit 8c740dcea254a1472df2c0ac5ac585412a2507ec >>>>> Author: Paulo Zanoni <paulo.r.zanoni@intel.com> >>>>> Date: Fri Oct 17 18:42:03 2014 -0300 >>>>> drm/i915: disable IPS while getting the pipe CRCs. >>>>> >>>>> For some unknown reason, when IPS gets enabled, the sink CRC changes. >>>>> Since hsw_enable_ips() doesn't really guarantee to enable IPS (it >>>>> depends on package C-states), we can't really predict if IPS is >>>>> enabled or disabled while running our CRC tests, so let's just >>>>> completely disable IPS while sink CRCs are being used. >>>>> >>>>> If we find a way to make IPS not change the pipe CRC result, we may >>>>> want to fix IPS and then revert this patch (and 8c740dcea too). While >>>>> this doesn't happen, let's merge this patch, so the IGT tests relying >>>>> on sink CRCs can work properly. >>>>> >>>>> This was discovered while developing a new IGT test, which will >>>>> probably be called kms_frontbuffer_tracking. >>>>> >>>>> Testcase: igt/kms_frontbuffer_tracking (not on upstream IGT yet) >>>>> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> >>>>> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> >>>>> --- >>>>> drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++------------- >>>>> 1 file changed, 45 insertions(+), 21 deletions(-) >>>>> >>>>> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c >>>>> index abd442a..62662de 100644 >>>>> --- a/drivers/gpu/drm/i915/intel_dp.c >>>>> +++ b/drivers/gpu/drm/i915/intel_dp.c >>>>> @@ -4041,46 +4041,70 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) >>>>> u8 buf; >>>>> int test_crc_count; >>>>> int attempts = 6; >>>>> + int ret = 0; >>>>> >>>>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) >>>>> - return -EIO; >>>>> + hsw_disable_ips(intel_crtc); >>>>> >>>>> - if (!(buf & DP_TEST_CRC_SUPPORTED)) >>>>> - return -ENOTTY; >>>>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { >>>>> + ret = -EIO; >>>>> + goto out; >>>>> + } >>>>> + >>>>> + if (!(buf & DP_TEST_CRC_SUPPORTED)) { >>>>> + ret = -ENOTTY; >>>>> + goto out; >>>>> + } >>>>> >>>>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) >>>>> - return -EIO; >>>>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { >>>>> + ret = -EIO; >>>>> + goto out; >>>>> + } >>>>> >>>>> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, >>>>> - buf | DP_TEST_SINK_START) < 0) >>>>> - return -EIO; >>>>> + buf | DP_TEST_SINK_START) < 0) { >>>>> + ret = -EIO; >>>>> + goto out; >>>>> + } >>>>> + >>>>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { >>>>> + ret = -EIO; >>>>> + goto out; >>>>> + } >>>>> >>>>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) >>>>> - return -EIO; >>>>> test_crc_count = buf & DP_TEST_COUNT_MASK; >>>>> >>>>> do { >>>>> if (drm_dp_dpcd_readb(&intel_dp->aux, >>>>> - DP_TEST_SINK_MISC, &buf) < 0) >>>>> - return -EIO; >>>>> + DP_TEST_SINK_MISC, &buf) < 0) { >>>>> + ret = -EIO; >>>>> + goto out; >>>>> + } >>>>> intel_wait_for_vblank(dev, intel_crtc->pipe); >>>>> } while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count); >>>>> >>>>> if (attempts == 0) { >>>>> DRM_DEBUG_KMS("Panel is unable to calculate CRC after 6 vblanks\n"); >>>>> - return -ETIMEDOUT; >>>>> + ret = -ETIMEDOUT; >>>>> + goto out; >>>>> } >>>>> >>>>> - if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) >>>>> - return -EIO; >>>>> + if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) { >>>>> + ret = -EIO; >>>>> + goto out; >>>>> + } >>>>> >>>>> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) >>>>> - return -EIO; >>>>> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { >>>>> + ret = -EIO; >>>>> + goto out; >>>>> + } >>>>> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, >>>>> - buf & ~DP_TEST_SINK_START) < 0) >>>>> - return -EIO; >>>>> - >>>>> - return 0; >>>>> + buf & ~DP_TEST_SINK_START) < 0) { >>>>> + ret = -EIO; >>>>> + goto out; >>>>> + } >>>>> +out: >>>>> + hsw_enable_ips(intel_crtc); >>>>> + return ret; >>>>> } >>>>> >>>>> static bool >>>>> -- >>>>> 2.1.4 >>>>> >>>>> _______________________________________________ >>>>> Intel-gfx mailing list >>>>> Intel-gfx@lists.freedesktop.org >>>>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx >>>> >>>> >>>> >>>> -- >>>> Rodrigo Vivi >>>> Blog: http://blog.vivi.eng.br >>> >>> >>> >>> -- >>> Paulo Zanoni >> >> >> >> -- >> Rodrigo Vivi >> Blog: http://blog.vivi.eng.br > > > > -- > Paulo Zanoni -- Rodrigo Vivi Blog: http://blog.vivi.eng.br _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/i915: disable IPS while getting the sink CRCs 2015-05-27 19:42 ` Paulo Zanoni 2015-05-27 20:06 ` Rodrigo Vivi @ 2015-05-28 8:05 ` Daniel Vetter 1 sibling, 0 replies; 7+ messages in thread From: Daniel Vetter @ 2015-05-28 8:05 UTC (permalink / raw) To: Paulo Zanoni; +Cc: intel-gfx, Paulo Zanoni, Rodrigo Vivi On Wed, May 27, 2015 at 04:42:08PM -0300, Paulo Zanoni wrote: > 2015-05-27 16:35 GMT-03:00 Rodrigo Vivi <rodrigo.vivi@gmail.com>: > > I didn't face this since I was letting IPS disabled on my tests here > > and the platforms that I'm mostly concerned about sink CRC not working > > well are the ones that doesn't have IPS. Bummer, I was hopeful this would help. I guess we need to dig more and need to try to figure out what more is broken here. Maybe some panels just have broken CRCs? > > I'm not sure this is the right way to solve this issue. Maybe we want > > to know the sink CRC when IPS is on. > > I believe the right approach is to provide a sysfs interface to toggle > > ips off so testcase can disabled ips to not get impacted by it when > > reading sink CRC. and than, enable it back if it was enabled after > > test is concluded. > > > > But anyway, this is a simple solution that we have right now and we > > can change it once we have the sysfs interface, so: > > Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> > > We do have the sysfs interface: > echo 0 > /sys/module/i915/parameters/enable_ips > > I think we should have consistency between both source and sink CRCs. > So if we decide to go for the sysfs solution we need to revert the > "disable IPS while getting the source CRCs" patch and then fix IGT so > it always disables IPS for all CRC tests. > > I prefer the Kernel solution since IMHO it is much simpler and makes > sure IGT is always correct, but if we decide to go for the sysfs > solution I can write the patches. I guess a third (and fourth and > fifth) opinion from someone else here would help. Anybody? I agree with Paulo that the kernel solution seems to be the best. We already have similar tricks on some platforms for crcs where we e.g. need to put the scrambler into a non-compliant mode or switch to a different output routing/power well config for edp. If this kind of magic ever becomes a problem then we can look into adding more raw crc interfaces. But I honestly don't expect this to happen - we want to make sure that the right picture gets composited, validating individual parts of the hw pipeline (like whether ips or a different routing or whatever works correctly) is a job for SV, not us. Queued for -next, thanks for the patch. -Daniel > > > > > > > > > On Mon, May 25, 2015 at 2:52 PM, Paulo Zanoni <przanoni@gmail.com> wrote: > >> From: Paulo Zanoni <paulo.r.zanoni@intel.com> > >> > >> This commit is the "sink CRC" version of: > >> > >> commit 8c740dcea254a1472df2c0ac5ac585412a2507ec > >> Author: Paulo Zanoni <paulo.r.zanoni@intel.com> > >> Date: Fri Oct 17 18:42:03 2014 -0300 > >> drm/i915: disable IPS while getting the pipe CRCs. > >> > >> For some unknown reason, when IPS gets enabled, the sink CRC changes. > >> Since hsw_enable_ips() doesn't really guarantee to enable IPS (it > >> depends on package C-states), we can't really predict if IPS is > >> enabled or disabled while running our CRC tests, so let's just > >> completely disable IPS while sink CRCs are being used. > >> > >> If we find a way to make IPS not change the pipe CRC result, we may > >> want to fix IPS and then revert this patch (and 8c740dcea too). While > >> this doesn't happen, let's merge this patch, so the IGT tests relying > >> on sink CRCs can work properly. > >> > >> This was discovered while developing a new IGT test, which will > >> probably be called kms_frontbuffer_tracking. > >> > >> Testcase: igt/kms_frontbuffer_tracking (not on upstream IGT yet) > >> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> > >> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> > >> --- > >> drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++------------- > >> 1 file changed, 45 insertions(+), 21 deletions(-) > >> > >> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c > >> index abd442a..62662de 100644 > >> --- a/drivers/gpu/drm/i915/intel_dp.c > >> +++ b/drivers/gpu/drm/i915/intel_dp.c > >> @@ -4041,46 +4041,70 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) > >> u8 buf; > >> int test_crc_count; > >> int attempts = 6; > >> + int ret = 0; > >> > >> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) > >> - return -EIO; > >> + hsw_disable_ips(intel_crtc); > >> > >> - if (!(buf & DP_TEST_CRC_SUPPORTED)) > >> - return -ENOTTY; > >> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { > >> + ret = -EIO; > >> + goto out; > >> + } > >> + > >> + if (!(buf & DP_TEST_CRC_SUPPORTED)) { > >> + ret = -ENOTTY; > >> + goto out; > >> + } > >> > >> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) > >> - return -EIO; > >> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { > >> + ret = -EIO; > >> + goto out; > >> + } > >> > >> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, > >> - buf | DP_TEST_SINK_START) < 0) > >> - return -EIO; > >> + buf | DP_TEST_SINK_START) < 0) { > >> + ret = -EIO; > >> + goto out; > >> + } > >> + > >> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) { > >> + ret = -EIO; > >> + goto out; > >> + } > >> > >> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) > >> - return -EIO; > >> test_crc_count = buf & DP_TEST_COUNT_MASK; > >> > >> do { > >> if (drm_dp_dpcd_readb(&intel_dp->aux, > >> - DP_TEST_SINK_MISC, &buf) < 0) > >> - return -EIO; > >> + DP_TEST_SINK_MISC, &buf) < 0) { > >> + ret = -EIO; > >> + goto out; > >> + } > >> intel_wait_for_vblank(dev, intel_crtc->pipe); > >> } while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count); > >> > >> if (attempts == 0) { > >> DRM_DEBUG_KMS("Panel is unable to calculate CRC after 6 vblanks\n"); > >> - return -ETIMEDOUT; > >> + ret = -ETIMEDOUT; > >> + goto out; > >> } > >> > >> - if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) > >> - return -EIO; > >> + if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) { > >> + ret = -EIO; > >> + goto out; > >> + } > >> > >> - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) > >> - return -EIO; > >> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { > >> + ret = -EIO; > >> + goto out; > >> + } > >> if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, > >> - buf & ~DP_TEST_SINK_START) < 0) > >> - return -EIO; > >> - > >> - return 0; > >> + buf & ~DP_TEST_SINK_START) < 0) { > >> + ret = -EIO; > >> + goto out; > >> + } > >> +out: > >> + hsw_enable_ips(intel_crtc); > >> + return ret; > >> } > >> > >> static bool > >> -- > >> 2.1.4 > >> > >> _______________________________________________ > >> Intel-gfx mailing list > >> Intel-gfx@lists.freedesktop.org > >> http://lists.freedesktop.org/mailman/listinfo/intel-gfx > > > > > > > > -- > > Rodrigo Vivi > > Blog: http://blog.vivi.eng.br > > > > -- > Paulo Zanoni > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2015-05-28 8:02 UTC | newest] Thread overview: 7+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2015-05-25 21:52 [PATCH] drm/i915: disable IPS while getting the sink CRCs Paulo Zanoni 2015-05-27 19:35 ` Rodrigo Vivi 2015-05-27 19:42 ` Paulo Zanoni 2015-05-27 20:06 ` Rodrigo Vivi 2015-05-27 20:14 ` Paulo Zanoni 2015-05-27 20:25 ` Rodrigo Vivi 2015-05-28 8:05 ` Daniel Vetter
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