Re: [PATCH 2/2] drm/i915: Do not enable IPS with the primary plane disabled.

[Jani Nikula <jani.nikula@linux.intel.com>]

On Wed, 26 Aug 2015, Maarten Lankhorst <maarten.lankhorst@linux.intel.com> wrote:
> This fixes kms_universal_plane.universal-plane-pipe-A-functional.
>
> IPS gets enabled even though the primary plane is disabled. This is
> not supported, and results in warnings like below:
>
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1707 at drivers/gpu/drm/i915/intel_display.c:1354
> assert_plane.constprop.66+0x70/0xa0 [i915]()
> plane A assertion failure (expected on, current off)
> Modules linked in: i915
> CPU: 0 PID: 1707 Comm: kms_universal_p Tainted: G        W
> 4.2.0-rc2-patser+ #4288
> Hardware name: NUC5i7RYB,
> BIOS RYBDWi35.86A.0246.2015.0309.1355 03/09/2015
>  ffffffffc01d3278 ffff8800ccc37c88 ffffffff816f6e74 0000000080000000
>  ffff8800ccc37cd8 ffff8800ccc37cc8 ffffffff8107bfe1 ffff8800ccc37ca8
>  0000000000000000 ffff880117aa4520 ffff8800d7435388 ffff8800d5170000
> Call Trace:
>  [<ffffffff816f6e74>] dump_stack+0x4f/0x7b
>  [<ffffffff8107bfe1>] warn_slowpath_common+0x81/0xc0
>  [<ffffffff8107c061>] warn_slowpath_fmt+0x41/0x50
>  [<ffffffffc016a270>] assert_plane.constprop.66+0x70/0xa0 [i915]
>  [<ffffffffc0173510>] hsw_enable_ips+0x50/0x150 [i915]
>  [<ffffffffc0128a63>] display_crc_ctl_write+0x623/0xbf0 [i915]
>  [<ffffffff81192153>] __vfs_write+0x23/0xe0
>  [<ffffffff81195334>] ? __sb_start_write+0x44/0xf0
>  [<ffffffff81277718>] ? security_file_permission+0x38/0xc0
>  [<ffffffff81192b34>] vfs_write+0xa4/0x190
>  [<ffffffff810d73de>] ? do_setitimer+0x12e/0x220
>  [<ffffffff81193741>] SyS_write+0x41/0xa0
>  [<ffffffff816fdad7>] entry_SYSCALL_64_fastpath+0x12/0x6a
> ---[ end trace 264b7f8804a754c3 ]---
>
> This can be fixed easily by checking primary->visible.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

Maarten, this series has no reviews and it no longer applies to v4.3
cleanly. Please rebase and repost if it's still valid.

BR,
Jani.


> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index caf1382116de..9abf70cb3525 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -3799,7 +3799,13 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe,
>  		 * user space can't make reliable use of the CRCs, so let's just
>  		 * completely disable it.
>  		 */
> -		hsw_disable_ips(crtc);
> +
> +		if (HAS_IPS(dev) && pipe == PIPE_A) {
> +			drm_modeset_lock(&crtc->base.primary->mutex, NULL);
> +			if (to_intel_plane_state(crtc->base.primary->state)->visible)
> +				hsw_disable_ips(crtc);
> +			drm_modeset_unlock(&crtc->base.primary->mutex);
> +		}
>  
>  		spin_lock_irq(&pipe_crc->lock);
>  		kfree(pipe_crc->entries);
> @@ -3843,8 +3849,12 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe,
>  			vlv_undo_pipe_scramble_reset(dev, pipe);
>  		else if (IS_HASWELL(dev) && pipe == PIPE_A)
>  			hsw_undo_trans_edp_pipe_A_crc_wa(dev);
> -
> -		hsw_enable_ips(crtc);
> +		else if (HAS_IPS(dev) && pipe == PIPE_A) {
> +			drm_modeset_lock(&crtc->base.primary->mutex, NULL);
> +			if (to_intel_plane_state(crtc->base.primary->state)->visible)
> +				hsw_enable_ips(crtc);
> +			drm_modeset_unlock(&crtc->base.primary->mutex);
> +		}
>  	}
>  
>  	return 0;
> -- 
> 2.1.0
>
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-- 
Jani Nikula, Intel Open Source Technology Center
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