Daniel Vetter 2492935248 drm/i915: read out the modeset hw state at load and resume time ... ... instead of resetting a few things and hoping that this will work out. To properly disable the output pipelines at the initial modeset after resume or boot up we need to have an accurate picture of which outputs are enabled and connected to which crtcs. Otherwise we risk disabling things at the wrong time, which can lead to hangs (or at least royally confused panels), both requiring a walk to the reset button to fix. Hence read out the hw state with the freshly introduce get_hw_state functions and then sanitize it afterwards. For a full modeset readout (which would allow us to avoid the initial modeset at boot up) a few things are still missing: - Reading out the mode from the pipe, especially the dotclock computation is quite some fun. - Reading out the parameters for the stolen memory framebuffer and wrapping it up. - Reading out the pch pll connections - luckily the disable code simply bails out if the crtc doesn't have a pch pll attached (even for configurations that would need one). This patch here turned up tons of smelly stuff around resume: We restore tons of register in seemingly random way (well, not quite, but we're not too careful either), which leaves the hw in a rather ill-defined state: E.g. the port registers are sometimes unconditionally restore (lvds, crt), leaving us with an active encoder/connector but no active pipe connected to it. Luckily the hw state sanitizer detects this madness and fixes things up a bit. v2: When checking whether an encoder with active connectors has a crtc wire up to it, check for both the crtc _and_ it's active state. v3: - Extract intel_sanitize_encoder. - Manually disable active encoders without an active pipe. v4: Correclty fix up the pipe<->plane mapping on machines where we switch pipes/planes. Noticed by Chris Wilson, who also provided the fixup. v5: Spelling fix in a comment, noticed by Paulo Zanoni Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>		2012-09-06 07:59:24 +02:00
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drm	drm/i915: read out the modeset hw state at load and resume time	2012-09-06 07:59:24 +02:00
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vga	vga_switcheroo: Enable/disable audio clients at the right time	2012-06-09 12:14:43 +02:00
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