[PATCH v2 11/40] drm/i915: Do not read PSR2 register in transcoders without PSR2

Lucas De Marchi
2019-08-17T09:39:32Z

From: José Roberto de Souza <jose.souza@intel.com>

This fix unclaimed access warnings:

[ 245.525788] ------------[ cut here ]------------
[ 245.525884] Unclaimed read from register 0x62900
[ 245.526154] WARNING: CPU: 0 PID: 1234 at drivers/gpu/drm/i915/intel_uncore.c:1100 __unclaimed_reg_debug+0x40/0x50 [i915]
[ 245.526160] Modules linked in: i915 x86_pkg_temp_thermal ax88179_178a coretemp usbnet crct10dif_pclmul mii crc32_pclmul ghash_clmulni_intel e1000e [last unloaded: i915]
[ 245.526191] CPU: 0 PID: 1234 Comm: kms_fullmodeset Not tainted 5.1.0-rc6+ #915
[ 245.526197] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake U DDR4 SODIMM RVP, BIOS TGLSFWR1.D00.2081.A10.1904182155 04/18/2019
[ 245.526273] RIP: 0010:__unclaimed_reg_debug+0x40/0x50 [i915]
[ 245.526281] Code: 74 05 5b 5d 41 5c c3 45 84 e4 48 c7 c0 76 97 21 a0 48 c7 c6 6c 97 21 a0 89 ea 48 0f 44 f0 48 c7 c7 7f 97 21 a0 e8 4f 1e fe e0 <0f> 0b 83 2d 6f d9 1c 00 01 5b 5d 41 5c c3 66 90 41 57 41 56 41 55
[ 245.526288] RSP: 0018:ffffc900006bf7d8 EFLAGS: 00010086
[ 245.526297] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 245.526304] RDX: 0000000000000007 RSI: 0000000000000000 RDI: 00000000ffffffff
[ 245.526310] RBP: 0000000000061900 R08: 0000000000000000 R09: 0000000000000001
[ 245.526317] R10: 0000000000000006 R11: 0000000000000000 R12: 0000000000000001
[ 245.526324] R13: 0000000000000000 R14: ffff8882914f0d58 R15: 0000000000000206
[ 245.526332] FS: 00007fed2a3c39c0(0000) GS:ffff8882a8600000(0000) knlGS:0000000000000000
[ 245.526340] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 245.526347] CR2: 00007fed28dff000 CR3: 00000002a086c006 CR4: 0000000000760ef0
[ 245.526354] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 245.526361] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 245.526367] PKRU: 55555554
[ 245.526373] Call Trace:
[ 245.526454] gen11_fwtable_read32+0x219/0x250 [i915]
[ 245.526576] intel_psr_activate+0x57/0x400 [i915]
[ 245.526697] intel_psr_enable_locked+0x367/0x4b0 [i915]
[ 245.526828] intel_psr_enable+0xa4/0xd0 [i915]
[ 245.526946] intel_enable_ddi+0x127/0x2f0 [i915]
[ 245.527075] intel_encoders_enable.isra.79+0x62/0x90 [i915]
[ 245.527202] haswell_crtc_enable+0x2a2/0x850 [i915]
[ 245.527337] intel_update_crtc+0x51/0x360 [i915]
[ 245.527466] skl_update_crtcs+0x26c/0x300 [i915]
[ 245.527603] intel_atomic_commit_tail+0x3e5/0x13c0 [i915]
[ 245.527757] intel_atomic_commit+0x24d/0x2d0 [i915]
[ 245.527782] drm_atomic_helper_set_config+0x7b/0x90
[ 245.527799] drm_mode_setcrtc+0x1b4/0x6f0
[ 245.527856] ? drm_mode_getcrtc+0x180/0x180
[ 245.527867] drm_ioctl_kernel+0xad/0xf0
[ 245.527886] drm_ioctl+0x2f4/0x3b0
[ 245.527902] ? drm_mode_getcrtc+0x180/0x180
[ 245.527935] ? rcu_read_lock_sched_held+0x6f/0x80
[ 245.527956] do_vfs_ioctl+0xa0/0x6d0
[ 245.527970] ? __task_pid_nr_ns+0xb6/0x200
[ 245.527991] ksys_ioctl+0x35/0x70
[ 245.528009] __x64_sys_ioctl+0x11/0x20
[ 245.528020] do_syscall_64+0x55/0x180
[ 245.528034] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 245.528042] RIP: 0033:0x7fed2cc7c3c7
[ 245.528050] Code: 00 00 90 48 8b 05 c9 3a 0d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 99 3a 0d 00 f7 d8 64 89 01 48
[ 245.528057] RSP: 002b:00007ffe36944378 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 245.528067] RAX: ffffffffffffffda RBX: 00007ffe369443b0 RCX: 00007fed2cc7c3c7
[ 245.528074] RDX: 00007ffe369443b0 RSI: 00000000c06864a2 RDI: 0000000000000003
[ 245.528081] RBP: 00007ffe369443b0 R08: 0000000000000000 R09: 0000564c0173ae98
[ 245.528088] R10: 0000564c0173aeb8 R11: 0000000000000246 R12: 00000000c06864a2
[ 245.528095] R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
[ 245.528128] irq event stamp: 140866
[ 245.528138] hardirqs last enabled at (140865): [<ffffffff819a63dc>] _raw_spin_unlock_irqrestore+0x4c/0x60
[ 245.528148] hardirqs last disabled at (140866): [<ffffffff819a624d>] _raw_spin_lock_irqsave+0xd/0x50
[ 245.528158] softirqs last enabled at (140860): [<ffffffff81c0038c>] __do_softirq+0x38c/0x499
[ 245.528170] softirqs last disabled at (140853): [<ffffffff810b4a09>] irq_exit+0xa9/0xc0
[ 245.528247] WARNING: CPU: 0 PID: 1234 at drivers/gpu/drm/i915/intel_uncore.c:1100 __unclaimed_reg_debug+0x40/0x50 [i915]
[ 245.528254] ---[ end trace 366069676e98a410 ]---

Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
drivers/gpu/drm/i915/display/intel_psr.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 5d5991057f07..66db9ce95da9 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -632,7 +632,8 @@ static void intel_psr_activate(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);

- if (INTEL_GEN(dev_priv) >= 9)
+ if (INTEL_GEN(dev_priv) >= 9 &&
+ _psr2_supported_in_trans(dev_priv, dev_priv->psr.transcoder))
WARN_ON(I915_READ(EDP_PSR2_CTL(dev_priv->psr.transcoder)) & EDP_PSR2_ENABLE);
WARN_ON(I915_READ(EDP_PSR_CTL(dev_priv->psr.transcoder)) & EDP_PSR_ENABLE);
WARN_ON(dev_priv->psr.active);
@@ -786,7 +787,8 @@ static void intel_psr_exit(struct drm_i915_private *dev_priv)
u32 val;

if (!dev_priv->psr.active) {
- if (INTEL_GEN(dev_priv) >= 9) {
+ if (INTEL_GEN(dev_priv) >= 9 &&
+ _psr2_supported_in_trans(dev_priv, dev_priv->psr.transcoder)) {
val = I915_READ(EDP_PSR2_CTL(dev_priv->psr.transcoder));
WARN_ON(val & EDP_PSR2_ENABLE);
}
--
2.21.0