| Message ID | 1691533190-19335-1-git-send-email-quic_khsieh@quicinc.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [v1] drm/msm/dp: do not reinitialize phy unless retry during link training | expand |
On 8/8/2023 3:19 PM, Kuogee Hsieh wrote: > DP PHY re-initialization done using dp_ctrl_reinitialize_mainlink() will > cause PLL unlocked initially and then PLL gets locked at the end of > initialization. PLL_UNLOCKED interrupt will fire during this time if the > interrupt mask is enabled. There should be a line break here. > However currently DP driver link training implementation incorrectly > re-initializes PHY unconditionally during link training as the PHY was > already configured in dp_ctrl_enable_mainlink_clocks(). > > Fix this by re-initializing the PHY only if the previous link training > failed. > > [drm:dp_aux_isr] *ERROR* Unexpected DP AUX IRQ 0x01000000 when not busy > > Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") > Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/30 > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> I tested and confirm that without this patch, I see this spam atleast once per reboot but after this patch, I have not seen this for 5 consecutive reboots. Hence, Tested-by: Abhinav Kumar <quic_abhinavk@quicinc.com> # sc7280 Looking at the code flow, the dp_ctrl_reinitialize_mainlink() certainly looks redundant where it is, considering that the clks were enabled just a couple of lines above in dp_ctrl_enable_mainlink_clocks(). Hence with the minor fix in the commit, Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> > --- > drivers/gpu/drm/msm/dp/dp_ctrl.c | 13 ++++++------- > 1 file changed, 6 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c > index a7a5c7e..77a8d93 100644 > --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c > +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c > @@ -1774,13 +1774,6 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) > return rc; > > while (--link_train_max_retries) { > - rc = dp_ctrl_reinitialize_mainlink(ctrl); > - if (rc) { > - DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n", > - rc); > - break; > - } > - > training_step = DP_TRAINING_NONE; > rc = dp_ctrl_setup_main_link(ctrl, &training_step); > if (rc == 0) { > @@ -1832,6 +1825,12 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) > /* stop link training before start re training */ > dp_ctrl_clear_training_pattern(ctrl); > } > + > + rc = dp_ctrl_reinitialize_mainlink(ctrl); > + if (rc) { > + DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n", rc); > + break; > + } > } > > if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
Quoting Kuogee Hsieh (2023-08-08 15:19:50) > DP PHY re-initialization done using dp_ctrl_reinitialize_mainlink() will > cause PLL unlocked initially and then PLL gets locked at the end of > initialization. PLL_UNLOCKED interrupt will fire during this time if the > interrupt mask is enabled. > However currently DP driver link training implementation incorrectly > re-initializes PHY unconditionally during link training as the PHY was > already configured in dp_ctrl_enable_mainlink_clocks(). > > Fix this by re-initializing the PHY only if the previous link training > failed. > > [drm:dp_aux_isr] *ERROR* Unexpected DP AUX IRQ 0x01000000 when not busy > > Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") > Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/30 > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > --- Reviewed-by: Stephen Boyd <swboyd@chromium.org>
On 09/08/2023 01:19, Kuogee Hsieh wrote: > DP PHY re-initialization done using dp_ctrl_reinitialize_mainlink() will > cause PLL unlocked initially and then PLL gets locked at the end of > initialization. PLL_UNLOCKED interrupt will fire during this time if the > interrupt mask is enabled. > However currently DP driver link training implementation incorrectly > re-initializes PHY unconditionally during link training as the PHY was > already configured in dp_ctrl_enable_mainlink_clocks(). > > Fix this by re-initializing the PHY only if the previous link training > failed. > > [drm:dp_aux_isr] *ERROR* Unexpected DP AUX IRQ 0x01000000 when not busy > > Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") > Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/30 > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > --- > drivers/gpu/drm/msm/dp/dp_ctrl.c | 13 ++++++------- > 1 file changed, 6 insertions(+), 7 deletions(-) Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
On Tue, Aug 08, 2023 at 03:19:50PM -0700, Kuogee Hsieh wrote: > DP PHY re-initialization done using dp_ctrl_reinitialize_mainlink() will > cause PLL unlocked initially and then PLL gets locked at the end of > initialization. PLL_UNLOCKED interrupt will fire during this time if the > interrupt mask is enabled. > However currently DP driver link training implementation incorrectly > re-initializes PHY unconditionally during link training as the PHY was > already configured in dp_ctrl_enable_mainlink_clocks(). > > Fix this by re-initializing the PHY only if the previous link training > failed. > > [drm:dp_aux_isr] *ERROR* Unexpected DP AUX IRQ 0x01000000 when not busy > > Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") > Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/30 > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> This fixes the above warning and avoids the unnecessary PHY power-off and power-on during boot of the ThinkPad X13s: Reviewed-by: Johan Hovold <johan+linaro@kernel.org> Tested-by: Johan Hovold <johan+linaro@kernel.org> I guess this one should go to stable as well: Cc: stable@vger.kernel.org # 5.10 Is anyone planning on getting this fixed in 6.6-rc? I noticed that this one still hasn't shown up linux-next. > --- > drivers/gpu/drm/msm/dp/dp_ctrl.c | 13 ++++++------- > 1 file changed, 6 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c > index a7a5c7e..77a8d93 100644 > --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c > +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c > @@ -1774,13 +1774,6 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) > return rc; > > while (--link_train_max_retries) { > - rc = dp_ctrl_reinitialize_mainlink(ctrl); > - if (rc) { > - DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n", > - rc); > - break; > - } > - > training_step = DP_TRAINING_NONE; > rc = dp_ctrl_setup_main_link(ctrl, &training_step); > if (rc == 0) { > @@ -1832,6 +1825,12 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) > /* stop link training before start re training */ > dp_ctrl_clear_training_pattern(ctrl); > } > + > + rc = dp_ctrl_reinitialize_mainlink(ctrl); > + if (rc) { > + DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n", rc); > + break; > + } > } > > if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) Johan
On Tue, Oct 03, 2023 at 11:10:59AM +0200, Johan Hovold wrote: > On Tue, Aug 08, 2023 at 03:19:50PM -0700, Kuogee Hsieh wrote: > > DP PHY re-initialization done using dp_ctrl_reinitialize_mainlink() will > > cause PLL unlocked initially and then PLL gets locked at the end of > > initialization. PLL_UNLOCKED interrupt will fire during this time if the > > interrupt mask is enabled. > > However currently DP driver link training implementation incorrectly > > re-initializes PHY unconditionally during link training as the PHY was > > already configured in dp_ctrl_enable_mainlink_clocks(). > > > > Fix this by re-initializing the PHY only if the previous link training > > failed. > > > > [drm:dp_aux_isr] *ERROR* Unexpected DP AUX IRQ 0x01000000 when not busy > > > > Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") > > Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/30 > > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > > This fixes the above warning and avoids the unnecessary PHY power-off > and power-on during boot of the ThinkPad X13s: > > Reviewed-by: Johan Hovold <johan+linaro@kernel.org> > Tested-by: Johan Hovold <johan+linaro@kernel.org> > > I guess this one should go to stable as well: > > Cc: stable@vger.kernel.org # 5.10 > > Is anyone planning on getting this fixed in 6.6-rc? I noticed that this > one still hasn't shown up linux-next. For the record, this one showed up in a PR from Rob and has now been forwarded to Linus. No stable tag included, but I guess we can ping the stable team unless AUTOSEL picks this up. Johan
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index a7a5c7e..77a8d93 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1774,13 +1774,6 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) return rc; while (--link_train_max_retries) { - rc = dp_ctrl_reinitialize_mainlink(ctrl); - if (rc) { - DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n", - rc); - break; - } - training_step = DP_TRAINING_NONE; rc = dp_ctrl_setup_main_link(ctrl, &training_step); if (rc == 0) { @@ -1832,6 +1825,12 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) /* stop link training before start re training */ dp_ctrl_clear_training_pattern(ctrl); } + + rc = dp_ctrl_reinitialize_mainlink(ctrl); + if (rc) { + DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n", rc); + break; + } } if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
DP PHY re-initialization done using dp_ctrl_reinitialize_mainlink() will cause PLL unlocked initially and then PLL gets locked at the end of initialization. PLL_UNLOCKED interrupt will fire during this time if the interrupt mask is enabled. However currently DP driver link training implementation incorrectly re-initializes PHY unconditionally during link training as the PHY was already configured in dp_ctrl_enable_mainlink_clocks(). Fix this by re-initializing the PHY only if the previous link training failed. [drm:dp_aux_isr] *ERROR* Unexpected DP AUX IRQ 0x01000000 when not busy Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/30 Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-)