search for: drm_dp_dpcd_writeb

...gt; + * > + * Returns 0 on success or a negative error code on failure. > + */ > +int drm_dp_lttpr_set_transparent_mode(struct drm_dp_aux *aux, bool enable) > +{ > + u8 val = enable ? DP_PHY_REPEATER_MODE_TRANSPARENT : > + DP_PHY_REPEATER_MODE_NON_TRANSPARENT; > + int ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE, val); > + > + return ret == 1 ? 0 : ret; This looks correct, but I had to go look at drm_dp_dpcd_writeb() to make sure it never returns 0 (for short transfers). > +} > +EXPORT_SYMBOL(drm_dp_lttpr_set_transparent_mode); This appears to be what the driver cur...

...> > + */ > >> > +int drm_dp_lttpr_set_transparent_mode(struct drm_dp_aux *aux, bool enable) > >> > +{ > >> > + u8 val = enable ? DP_PHY_REPEATER_MODE_TRANSPARENT : > >> > + DP_PHY_REPEATER_MODE_NON_TRANSPARENT; > >> > + int ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE, val); > >> > + > >> > + return ret == 1 ? 0 : ret; > >> > >> This looks correct, but I had to go look at drm_dp_dpcd_writeb() to make > >> sure it never returns 0 (for short transfers). > > > > Will follow Dm...

...ror code on failure. >> > + */ >> > +int drm_dp_lttpr_set_transparent_mode(struct drm_dp_aux *aux, bool enable) >> > +{ >> > + u8 val = enable ? DP_PHY_REPEATER_MODE_TRANSPARENT : >> > + DP_PHY_REPEATER_MODE_NON_TRANSPARENT; >> > + int ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE, val); >> > + >> > + return ret == 1 ? 0 : ret; >> >> This looks correct, but I had to go look at drm_dp_dpcd_writeb() to make >> sure it never returns 0 (for short transfers). > > Will follow Dmitry's proposal here. > >...

...success or a negative error code on failure. > > + */ > > +int drm_dp_lttpr_set_transparent_mode(struct drm_dp_aux *aux, bool enable) > > +{ > > + u8 val = enable ? DP_PHY_REPEATER_MODE_TRANSPARENT : > > + DP_PHY_REPEATER_MODE_NON_TRANSPARENT; > > + int ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE, val); > > + > > + return ret == 1 ? 0 : ret; > > This looks correct, but I had to go look at drm_dp_dpcd_writeb() to make > sure it never returns 0 (for short transfers). Will follow Dmitry's proposal here. if (ret < 0) return ret;...

This fixes some annoying issues on the P50-P52 with displays not being detected if they aren't plugged in at boot, and sometimes even when they are plugged in at boot. See: https://bugzilla.redhat.com/show_bug.cgi?id=1477182 Lyude Paul (2): drm/nouveau: Only write DP_MSTM_CTRL when needed drm/nouveau: Reset MST branching unit before enabling drivers/gpu/drm/nouveau/dispnv50/disp.c | 65

...g suspend?\n"); + goto out_fail; + } - sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); - if (sret != DP_RECEIVER_CAP_SIZE) { - DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); - ret = -1; - goto out_unlock; - } + ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, + DP_MST_EN | + DP_UP_REQ_EN | + DP_UPSTREAM_IS_SRC); + if (ret < 0) { + DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); + goto out_fail; + } - ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, - DP_MST_EN | DP_UP_REQ_E...

...t;type == DCB_OUTPUT_DP) { + int ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr); - if (nv_encoder->dcb->type == DCB_OUTPUT_DP) { - int ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr); - - if (ret == 0) { - pwr &= ~DP_SET_POWER_MASK; - pwr |= DP_SET_POWER_D3; - drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr); - } + if (ret == 0) { + pwr &= ~DP_SET_POWER_MASK; + pwr |= DP_SET_POWER_D3; + drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr); } - - nv_encoder->update(nv_encoder, nv_crtc->index, NULL, 0, 0); - nv50_audio_disable(encoder, nv_crtc); - nv50_hdmi_disable...

Looking at both i915 and nouveau DP drivers, both are setting the first LTTPR (if found) in transparent mode first and then in non-transparent mode, just like the DP v2.0 specification mentions in section 3.6.6.1. Being part of the standard, setting the LTTPR in a specific operation mode can be easily moved in the generic framework. So do that by adding a new helper. Then, the msm DP driver is

Looking at both i915 and nouveau DP drivers, both are setting the first LTTPR (if found) in transparent mode first and then in non-transparent mode, just like the DP v2.0 specification mentions in section 3.6.6.1. Being part of the standard, setting the LTTPR in a specific operation mode can be easily moved in the generic framework. So do that by adding a new helper. Then, the msm DP driver is

Looking at both i915 and nouveau DP drivers, both are setting the first LTTPR (if found) in transparent mode first and then in non-transparent mode, just like the DP v2.0 specification mentions in section 3.6.6.1. Being part of the standard, setting the LTTPR in a specific operation mode can be easily moved in the generic framework. So do that by adding a new helper. Then, the msm DP driver is

...} > > - sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); > - if (sret != DP_RECEIVER_CAP_SIZE) { > - DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); > - ret = -1; > - goto out_unlock; > - } > + ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, > + DP_MST_EN | > + DP_UP_REQ_EN | > + DP_UPSTREAM_IS_SRC); > + if (ret < 0) { > + DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); > + goto out_fail; > + } > > - ret = drm_dp_dpcd_writeb(mgr->aux,...

...g suspend?\n"); + goto out_fail; + } - sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); - if (sret != DP_RECEIVER_CAP_SIZE) { - DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); - ret = -1; - goto out_unlock; - } + ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, + DP_MST_EN | + DP_UP_REQ_EN | + DP_UPSTREAM_IS_SRC); + if (ret < 0) { + DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); + goto out_fail; + } - ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, - DP_MST_EN | DP_UP_REQ_E...

...d failed\n"); > return false; > } > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h > index 0c141fc81aaa8..11649e93e5bb6 100644 > --- a/include/drm/drm_dp_helper.h > +++ b/include/drm/drm_dp_helper.h > @@ -1607,6 +1607,9 @@ static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux, > return drm_dp_dpcd_write(aux, offset, &value, 1); > } > > +int drm_dp_read_dpcd_caps(struct drm_dp_aux *aux, > + u8 dpcd[DP_RECEIVER_CAP_SIZE]); > + > int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, > u8 status[DP_LINK_S...

Here's some fixes for the less important DP AUX issues I mentioned a while back. Lyude Paul (2): drm/dp: Add ->pre/post_transfer() hooks for drm_dp_aux drm/nouveau: Grab an rpm reference before/after DP AUX transactions drivers/gpu/drm/drm_dp_helper.c | 5 ++ drivers/gpu/drm/nouveau/nouveau_connector.c | 36 ++++++++ drivers/gpu/drm/nouveau/nouveau_drm.c | 12 ++-

...le: Enable or disable transparent mode + * + * Returns 0 on success or a negative error code on failure. + */ +int drm_dp_lttpr_set_transparent_mode(struct drm_dp_aux *aux, bool enable) +{ + u8 val = enable ? DP_PHY_REPEATER_MODE_TRANSPARENT : + DP_PHY_REPEATER_MODE_NON_TRANSPARENT; + int ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE, val); + + if (ret < 0) + return ret; + + return (ret == 1) ? 0 : -EIO; +} +EXPORT_SYMBOL(drm_dp_lttpr_set_transparent_mode); + +/** + * drm_dp_lttpr_init - init LTTPR transparency mode according to DP standard + * + * @aux: DisplayPort AUX channel + * @lttpr_count: Nu...

This is the large series for adding MST suspend/resume reprobing that I've been working on for quite a while now. In addition, I: - Refactored and cleaned up any code I ended up digging through in the process of understanding how some parts of these helpers worked. - Added some debugging tools along the way that I ended up needing to figure out some issues in my own code Note that

...DRM_ERROR("LSPCON DPCD read failed\n"); return false; } diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 0c141fc81aaa8..11649e93e5bb6 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1607,6 +1607,9 @@ static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux, return drm_dp_dpcd_write(aux, offset, &value, 1); } +int drm_dp_read_dpcd_caps(struct drm_dp_aux *aux, + u8 dpcd[DP_RECEIVER_CAP_SIZE]); + int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, u8 status[DP_LINK_STATUS_SIZE]); -- 2.26.2

...truct drm_dp_sideband_msg_hdr hdr; + struct drm_dp_sideband_msg_req_body msg; + struct list_head next; +}; + static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, char *buf); @@ -3109,6 +3115,7 @@ void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, DP_MST_EN | DP_UPSTREAM_IS_SRC); mutex_unlock(&mgr->lock); + flush_work(&mgr->up_req_work); flush_work(&mgr->work); flush_work(&mgr->delayed_destroy_work); } @@ -3281,12 +3288,70 @@ static int drm_dp_mst_handle_down_rep(struct drm...

...truct drm_dp_sideband_msg_hdr hdr; + struct drm_dp_sideband_msg_req_body msg; + struct list_head next; +}; + static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, char *buf); @@ -3091,6 +3097,7 @@ void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, DP_MST_EN | DP_UPSTREAM_IS_SRC); mutex_unlock(&mgr->lock); + flush_work(&mgr->up_req_work); flush_work(&mgr->work); flush_work(&mgr->delayed_destroy_work); } @@ -3263,12 +3270,70 @@ static int drm_dp_mst_handle_down_rep(struct drm...

Most of the reason I'm asking for an RFC here is because this code pulls a lot of code out of i915 and into shared DP helpers. Anyway-nouveau's HPD related code has been collecting dust for a while. Other then the occasional runtime PM related and MST related fixes, we're missing a lot of nice things that have been added to DRM since this was originally written. Additionally, the code