1. 02 Oct, 2015 7 commits
  2. 01 Oct, 2015 4 commits
  3. 30 Sep, 2015 20 commits
  4. 29 Sep, 2015 3 commits
  5. 28 Sep, 2015 2 commits
    • Michel Thierry's avatar
      drm/i915: Consider HW CSB write pointer before resetting the sw read pointer · dfc53c5e
      Michel Thierry authored
      A previous commit resets the Context Status Buffer (CSB) read pointer in
      ring init
          commit c0a03a2e ("drm/i915: Reset CSB read pointer in ring init")
      
      This is generally correct, but this pointer is not reset after
      suspend/resume in some platforms (cht). In this case, the driver should
      read the register value instead of resetting the sw read counter to 0.
      Otherwise we process old events, leading to unwanted pre-emptions or
      something worse.
      
      But in other platforms (bdw) and also during GPU reset or power up, the
      CSBWP is reset to 0x7 (an invalid number), and in this case the read
      pointer should be set to 5 (the interrupt code will increment this
      counter one more time, and will start reading from CSB[0]).
      
      v2: When the CSB registers are reset, the read pointer needs to be set
      to 5, otherwise the first write (CSB[0]) won't be read (Mika).
      Replace magic numbers with GEN8_CSB_ENTRIES (6) and GEN8_CSB_PTR_MASK
      (0x07).
      
      Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
      Cc: stable@vger.kernel.org # v4.0+
      Signed-off-by: default avatarLei Shen <lei.shen@intel.com>
      Signed-off-by: default avatarDeepak S <deepak.s@intel.com>
      Signed-off-by: default avatarMichel Thierry <michel.thierry@intel.com>
      Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@intel.com>
      Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
      dfc53c5e
    • Rodrigo Vivi's avatar
      drm/i915/skl: Don't call intel_prepare_ddi when encoder list isn't yet initialized. · bc5f2ab1
      Rodrigo Vivi authored
      In case something goes wrong with power well initialization we were calling
      intel_prepare_ddi during boot while encoder list isnt't initilized.
      
      [    9.618747] i915 0000:00:02.0: Invalid ROM contents
      [    9.631446] [drm] failed to find VBIOS tables
      [    9.720036] BUG: unable to handle kernel NULL pointer dereference at 00000000
      00000058
      [    9.721986] IP: [<ffffffffa014eb72>] ddi_get_encoder_port+0x82/0x190 [i915]
      [    9.723736] PGD 0
      [    9.724286] Oops: 0000 [#1] PREEMPT SMP
      [    9.725386] Modules linked in: intel_powerclamp snd_hda_intel(+) coretemp crc
      32c_intel snd_hda_codec snd_hda_core serio_raw snd_pcm snd_timer i915(+) parport
      _pc parport pinctrl_sunrisepoint pinctrl_intel nfsd nfs_acl
      [    9.730635] CPU: 0 PID: 497 Comm: systemd-udevd Not tainted 4.3.0-rc2-eywa-10
      967-g72de2cfd-dirty #2
      [    9.732785] Hardware name: Intel Corporation Cannonlake Client platform/Skyla
      ke DT DDR4 RVP8, BIOS CNLSE2R1.R00.X021.B00.1508040310 08/04/2015
      [    9.735785] task: ffff88008a704700 ti: ffff88016a1ac000 task.ti: ffff88016a1a
      c000
      [    9.737584] RIP: 0010:[<ffffffffa014eb72>]  [<ffffffffa014eb72>] ddi_get_enco
      der_port+0x82/0x190 [i915]
      [    9.739934] RSP: 0000:ffff88016a1af710  EFLAGS: 00010296
      [    9.741184] RAX: 000000000000004e RBX: ffff88008a9edc98 RCX: 0000000000000001
      [    9.742934] RDX: 000000000000004e RSI: ffffffff81fc1e82 RDI: 00000000ffffffff
      [    9.744634] RBP: ffff88016a1af730 R08: 0000000000000000 R09: 0000000000000578
      [    9.746333] R10: 0000000000001065 R11: 0000000000000578 R12: fffffffffffffff8
      [    9.748033] R13: ffff88016a1af7a8 R14: ffff88016a1af794 R15: 0000000000000000
      [    9.749733] FS:  00007eff2e1e07c0(0000) GS:ffff88016fc00000(0000) knlGS:00000
      00000000000
      [    9.751683] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [    9.753083] CR2: 0000000000000058 CR3: 000000016922b000 CR4: 00000000003406f0
      [    9.754782] Stack:
      [    9.755332]  ffff88008a9edc98 ffff88008a9ed800 ffffffffa01d07b0 00000000fffb9
      09e
      [    9.757232]  ffff88016a1af7d8 ffffffffa0154ea7 0000000000000246 ffff88016a370
      080
      [    9.759182]  ffff88016a370080 ffff88008a9ed800 0000000000000246 ffff88008a9ed
      c98
      [    9.761132] Call Trace:
      [    9.761782]  [<ffffffffa0154ea7>] intel_prepare_ddi+0x67/0x860 [i915]
      [    9.763332]  [<ffffffff81a56996>] ? _raw_spin_unlock_irqrestore+0x26/0x40
      [    9.765031]  [<ffffffffa00fad01>] ? gen9_read32+0x141/0x360 [i915]
      [    9.766531]  [<ffffffffa00b43e1>] skl_set_power_well+0x431/0xa80 [i915]
      [    9.768181]  [<ffffffffa00b4a63>] skl_power_well_enable+0x13/0x20 [i915]
      [    9.769781]  [<ffffffffa00b2188>] intel_power_well_enable+0x28/0x50 [i915]
      [    9.771481]  [<ffffffffa00b4d52>] intel_display_power_get+0x92/0xc0 [i915]
      [    9.773180]  [<ffffffffa00b4fcb>] intel_display_set_init_power+0x3b/0x40 [i91
      5]
      [    9.774980]  [<ffffffffa00b5170>] intel_power_domains_init_hw+0x120/0x520 [i9
      15]
      [    9.776780]  [<ffffffffa0194c61>] i915_driver_load+0xb21/0xf40 [i915]
      
      So let's protect this case.
      
      My first attempt was to remove the intel_prepare_ddi, but Daniel had pointed out
      this is really needed to restore those registers values. And Imre pointed out
      that this case was without the flag protection and this was actually where things
      were going bad. So I've just checked and this indeed solves my issue.
      
      The regressing intel_prepare_ddi call was added in
      
      commit 1d2b9526
      Author: Damien Lespiau <damien.lespiau@intel.com>
      Date:   Fri Mar 6 18:50:53 2015 +0000
      
          drm/i915/skl: Restore the DDI translation tables when enabling PW1
      
      Cc: Imre Deak <imre.deak@intel.com>
      Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
      Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
      Reviewed-by: default avatarImre Deak <imre.deak@intel.com>
      [Jani: regression reference]
      Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
      bc5f2ab1
  6. 27 Sep, 2015 4 commits