[Bug 99178] New: [SKL BAT] *ERROR* LSPCON resume failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99178

            Bug ID: 99178
           Summary: [SKL BAT] *ERROR* LSPCON resume failed
           Product: DRI
           Version: XOrg git
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: imre.deak at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

LSPCON initialization still fails sometimes during system resume. The machine
is an SKL-6770HQ, LSPCON is MegaChips with revisions HW-rev 2.1 SW-rev 1.29.
The plan is to fix this by waiting with the intialization of the chip until it
asserts HPD. 

[  205.411044] [drm:lspcon_resume [i915]] LSPCON recovering in PCON mode after
356 ms
[  205.411530] [drm:drm_dp_i2c_do_msg] native defer
[  205.412726] [drm:drm_dp_i2c_do_msg] native defer
[  205.413961] [drm:drm_dp_i2c_do_msg] native defer
[  205.415168] [drm:drm_dp_i2c_do_msg] native defer
[  205.416398] [drm:drm_dp_i2c_do_msg] native defer
[  205.417594] [drm:drm_dp_i2c_do_msg] native defer
[  205.418797] [drm:drm_dp_i2c_do_msg] native defer
[  205.419504] [drm:drm_dp_i2c_do_msg] too many retries, giving up
[  205.420002] [drm:drm_dp_i2c_do_msg] native defer
[  205.421198] [drm:drm_dp_i2c_do_msg] native defer
[  205.422418] [drm:drm_dp_i2c_do_msg] native defer
[  205.423622] [drm:drm_dp_i2c_do_msg] native defer
[  205.424817] [drm:drm_dp_i2c_do_msg] native defer
[  205.426014] [drm:drm_dp_i2c_do_msg] native defer
[  205.427225] [drm:drm_dp_i2c_do_msg] native defer
[  205.427930] [drm:drm_dp_i2c_do_msg] too many retries, giving up
[  205.427937] [drm:drm_lspcon_get_mode] *ERROR* LSPCON read(0x80, 0x41) failed
[  205.428000] [drm:lspcon_wait_mode [i915]] *ERROR* Error reading LSPCON mode
[  205.428055] [drm:lspcon_wait_mode [i915]] Current LSPCON mode INVALID
[  205.428553] [drm:drm_dp_i2c_do_msg] native defer
[  205.429750] [drm:drm_dp_i2c_do_msg] native defer
[  205.430961] [drm:drm_dp_i2c_do_msg] native defer
[  205.432158] [drm:drm_dp_i2c_do_msg] native defer
[  205.433350] [drm:drm_dp_i2c_do_msg] native defer
[  205.434564] [drm:drm_dp_i2c_do_msg] native defer
[  205.435762] [drm:drm_dp_i2c_do_msg] native defer
[  205.436468] [drm:drm_dp_i2c_do_msg] too many retries, giving up
[  205.436967] [drm:drm_dp_i2c_do_msg] native defer
[  205.438159] [drm:drm_dp_i2c_do_msg] native defer
[  205.439399] [drm:drm_dp_i2c_do_msg] native defer
[  205.440594] [drm:drm_dp_i2c_do_msg] native defer
[  205.441797] [drm:drm_dp_i2c_do_msg] native defer
[  205.443005] [drm:drm_dp_i2c_do_msg] native defer
[  205.444202] [drm:drm_dp_i2c_do_msg] native defer
[  205.444930] [drm:drm_dp_i2c_do_msg] too many retries, giving up
[  205.444936] [drm:drm_lspcon_get_mode] *ERROR* LSPCON read(0x80, 0x41) failed
[  205.445013] [drm:lspcon_change_mode.constprop.4 [i915]] *ERROR* Error
reading LSPCON mode
[  205.445062] [drm:lspcon_resume [i915]] *ERROR* LSPCON resume failed

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