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drm/msm/dpu: drop VBIF_NRT handling

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The second VBIF instance, VBIF_NRT, is only used for the separate inline
rotator block. It is unsupported by the DPU driver and will require a
separate driver (or separate instance of the DPU device).

The only possible user of VBIF_NRT is writeback on MSM8996, however
writeback on that platform is currently unsupported and it's not worth
keeping extra complexity for the sake of that single legacy platform.

None of the hardware catalogs entries actually declare VBIF_NRT, so it
is left in its default state.

Stop pretending that DPU driver cares about VBIF_NRT and drop it.

Reported-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/707773/
Link: https://lore.kernel.org/r/20260227-drop-vbif-nrt-v1-1-2b97d0438182@oss.qualcomm.com
This commit is contained in:
Dmitry Baryshkov 2026-02-27 20:36:40 +02:00
parent 82159db437
commit cfb64b0926
3 changed files with 0 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
View File

@ -286,7 +286,6 @@ enum dpu_wd_timer {
enum dpu_vbif {
VBIF_RT,
VBIF_NRT,
VBIF_MAX,
};

14
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
View File

@ -1357,14 +1357,6 @@ static int dpu_kms_mmap_mdp5(struct dpu_kms *dpu_kms)
return ret;
}
dpu_kms->vbif[VBIF_NRT] = msm_ioremap_mdss(mdss_dev,
dpu_kms->pdev,
"vbif_nrt_phys");
if (IS_ERR(dpu_kms->vbif[VBIF_NRT])) {
dpu_kms->vbif[VBIF_NRT] = NULL;
DPU_DEBUG("VBIF NRT is not defined");
}
return 0;
}
@ -1390,12 +1382,6 @@ static int dpu_kms_mmap_dpu(struct dpu_kms *dpu_kms)
return ret;
}
dpu_kms->vbif[VBIF_NRT] = msm_ioremap_quiet(pdev, "vbif_nrt");
if (IS_ERR(dpu_kms->vbif[VBIF_NRT])) {
dpu_kms->vbif[VBIF_NRT] = NULL;
DPU_DEBUG("VBIF NRT is not defined");
}
return 0;
}

2
drivers/gpu/drm/msm/disp/dpu1/dpu_vbif.c
View File

@ -24,8 +24,6 @@ static const char *dpu_vbif_name(enum dpu_vbif idx)
switch (idx) {
case VBIF_RT:
return "VBIF_RT";
case VBIF_NRT:
return "VBIF_NRT";
default:
return "??";
}