[Nouveau] [Bug 37669] [NVAC] problem when unplugging DP-1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37669

--- Comment #5 from Antoine Reversat <a.reversat at gmail.com> 2011-12-15 07:47:52 PST ---
So I've gotten a bit further.

I tracked down the code that triggers the issue : it's this part of nv50_sor.c
:

        if (!nv_wait(dev, NV50_PDISPLAY_SOR_DPMS_CTRL(or),
                    NV50_PDISPLAY_SOR_DPMS_CTRL_PENDING, 0)) {
            NV_ERROR(dev, "timeout: SOR_DPMS_CTRL_PENDING(%d) == 0\n", or);
            NV_ERROR(dev, "SOR_DPMS_CTRL(%d) = 0x%08x\n", or,
                    nv_rd32(dev, NV50_PDISPLAY_SOR_DPMS_CTRL(or)));
        }

        val = nv_rd32(dev, NV50_PDISPLAY_SOR_DPMS_CTRL(or));

        if (mode == DRM_MODE_DPMS_ON)
            val |= NV50_PDISPLAY_SOR_DPMS_CTRL_ON;
        else
            val &= ~NV50_PDISPLAY_SOR_DPMS_CTRL_ON;

        nv_wr32(dev, NV50_PDISPLAY_SOR_DPMS_CTRL(or), val |
                NV50_PDISPLAY_SOR_DPMS_CTRL_PENDING);
        if (!nv_wait(dev, NV50_PDISPLAY_SOR_DPMS_STATE(or),
                    NV50_PDISPLAY_SOR_DPMS_STATE_WAIT, 0)) {
            NV_ERROR(dev, "timeout: SOR_DPMS_STATE_WAIT(%d) == 0\n", or);
            NV_ERROR(dev, "SOR_DPMS_STATE(%d) = 0x%08x\n", or,
                    nv_rd32(dev, NV50_PDISPLAY_SOR_DPMS_STATE(or)));
        }


If I add an if to skip the code if the sor is going to DPMS off and the encoder
type is tmds then the bug doesn't happen anymore. I don't understand how this
affects sor0 (which the LVDS output is using) as the code seems pretty sane.

I also noted something and am not sure whether it's correct or not. My flat
panel is connected through a DP-DVI adapter but nv_encoder->dcb->type is
OUTPUT_TMDS not OUTPUT_DP. Is this due to the fact that it's "DVI over DP" ? Or
is this not normal ?

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