| Message ID | 1638985262-2072-1-git-send-email-quic_khsieh@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v5] drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read failed | expand |
Quoting Kuogee Hsieh (2021-12-08 09:41:02) > Add checking aux read/write status at both dp_link_parse_sink_count() > and dp_link_parse_sink_status_filed() to avoid long timeout delay if > dp aux read/write failed at timeout due to cable unplugged. > > Changes in V4: > -- split this patch as stand alone patch > > Changes in v5: > -- rebase on msm-next branch > > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > Remove this newline please. > Reviewed-by: Stephen Boyd <swboyd@chromium.org> > Tested-by: Stephen Boyd <swboyd@chromium.org> > --- > drivers/gpu/drm/msm/dp/dp_display.c | 12 +++++++++--- > drivers/gpu/drm/msm/dp/dp_link.c | 19 ++++++++++++++----- > 2 files changed, 23 insertions(+), 8 deletions(-) > > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c > index 3d61459..0766752 100644 > --- a/drivers/gpu/drm/msm/dp/dp_display.c > +++ b/drivers/gpu/drm/msm/dp/dp_display.c > @@ -692,9 +692,15 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data) > return 0; > } > > - ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); > - if (ret == -ECONNRESET) { /* cable unplugged */ > - dp->core_initialized = false; > + /* > + * dp core (ahb/aux clks) must be initialized before > + * irq_hpd be handled > + */ > + if (dp->core_initialized) { This part of the commit isn't described in the commit text. Can you add some more details in the commit text about this? > + ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); > + if (ret == -ECONNRESET) { /* cable unplugged */ > + dp->core_initialized = false; > + } > } > DRM_DEBUG_DP("hpd_state=%d\n", state); >
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 3d61459..0766752 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -692,9 +692,15 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data) return 0; } - ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); - if (ret == -ECONNRESET) { /* cable unplugged */ - dp->core_initialized = false; + /* + * dp core (ahb/aux clks) must be initialized before + * irq_hpd be handled + */ + if (dp->core_initialized) { + ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); + if (ret == -ECONNRESET) { /* cable unplugged */ + dp->core_initialized = false; + } } DRM_DEBUG_DP("hpd_state=%d\n", state); diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c index a5bdfc5..d4d31e5 100644 --- a/drivers/gpu/drm/msm/dp/dp_link.c +++ b/drivers/gpu/drm/msm/dp/dp_link.c @@ -737,18 +737,25 @@ static int dp_link_parse_sink_count(struct dp_link *dp_link) return 0; } -static void dp_link_parse_sink_status_field(struct dp_link_private *link) +static int dp_link_parse_sink_status_field(struct dp_link_private *link) { int len = 0; link->prev_sink_count = link->dp_link.sink_count; - dp_link_parse_sink_count(&link->dp_link); + len = dp_link_parse_sink_count(&link->dp_link); + if (len < 0) { + DRM_ERROR("DP parse sink count failed\n"); + return len; + } len = drm_dp_dpcd_read_link_status(link->aux, link->link_status); - if (len < DP_LINK_STATUS_SIZE) + if (len < DP_LINK_STATUS_SIZE) { DRM_ERROR("DP link status read failed\n"); - dp_link_parse_request(link); + return len; + } + + return dp_link_parse_request(link); } /** @@ -1023,7 +1030,9 @@ int dp_link_process_request(struct dp_link *dp_link) dp_link_reset_data(link); - dp_link_parse_sink_status_field(link); + ret = dp_link_parse_sink_status_field(link); + if (ret) + return ret; if (link->request.test_requested == DP_TEST_LINK_EDID_READ) { dp_link->sink_request |= DP_TEST_LINK_EDID_READ;