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SubjectRe: [ 005/117] drm/i915: make user mode sync polarity setting explicit
Date
On 2013-09-25 02:17 +0200, Greg Kroah-Hartman wrote:

> 3.11-stable review patch. If anyone has any objections, please let me know.

Sorry for being a bit late, I was traveling last week and only upgraded
my kernel yesterday.

> From: Imre Deak <imre.deak@intel.com>
>
> commit 2960bc9cceecb5d556ce1c07656a6609e2f7e8b0 upstream.
>
> Userspace can pass a mode with an unspecified vsync/hsync polarity
> setting. All encoders in the Intel driver take this to mean a negative
> polarity setting. The HW readout/state checker code on the other hand
> needs these flags to be explicitly set, otherwise the state checker will
> WARN about the mismatch.
>
> Get rid of the WARN by making the polarity setting explicit in the
> adjusted mode flags based on the requested mode flags. This will keep
> the existing behavior otherwise.
>
> Note that we could guess from the other timing parameters whether the
> user wanted a VESA or other standard mode and set the polarity
> accordingly. This is what the NV driver does
> (drivers/gpu/drm/nouveau/dispnv04/crtc.c), but I think that's not very
> exact and would change the existing behavior of the Intel driver.
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65442
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> Tested-by: cancan,feng <cancan.feng@intel.com>
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>
> ---
> drivers/gpu/drm/i915/intel_display.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -7809,6 +7809,19 @@ intel_modeset_pipe_config(struct drm_crt
> pipe_config->cpu_transcoder = to_intel_crtc(crtc)->pipe;
> pipe_config->shared_dpll = DPLL_ID_PRIVATE;
>
> + /*
> + * Sanitize sync polarity flags based on requested ones. If neither
> + * positive or negative polarity is requested, treat this as meaning
> + * negative polarity.
> + */
> + if (!(pipe_config->adjusted_mode.flags &
> + (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC)))
> + pipe_config->adjusted_mode.flags |= DRM_MODE_FLAG_NHSYNC;
> +
> + if (!(pipe_config->adjusted_mode.flags &
> + (DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)))
> + pipe_config->adjusted_mode.flags |= DRM_MODE_FLAG_NVSYNC;
> +
> /* Compute a starting value for pipe_config->pipe_bpp taking the source
> * plane pixel format and any sink constraints into account. Returns the
> * source plane bpp so that dithering can be selected on mismatches

After this patch I'm getting a drm error message on my laptop:

,----
| [ 0.840472] [drm:intel_pipe_config_compare] *ERROR* mismatch in adjusted_mode.flags (expected 2, found 0)
| [ 0.840533] ------------[ cut here ]------------
| [ 0.840583] WARNING: CPU: 0 PID: 66 at drivers/gpu/drm/i915/intel_display.c:8292 check_crtc_state+0x5f4/0x64a [i915]()
| [ 0.840585] pipe state doesn't match!
| [ 0.840587] Modules linked in: b44(+) mii sg sr_mod cdrom ssb ehci_pci(+) uhci_hcd ehci_hcd usbcore i915(+) cfbfillrect cfbimgblt video backlight usb_common thermal i2c_algo_bit cfbcopyarea drm_kms_helper drm button i2c_core
| [ 0.840610] CPU: 0 PID: 66 Comm: modprobe Not tainted 3.11.3-kms #1
| [ 0.840613] Hardware name: Acer TravelMate 2490 /Grapevine, BIOS V3.00 10/17/2006
| [ 0.840616] 00000000 ddabb884 c101d20e 00002064 e011e074 ddbcc000 dd9ca400 ddacc000
| [ 0.840622] ddabb89c c101d249 00000009 ddabb894 e01553ed ddabb8b0 ddabbaf0 e011e074
| [ 0.840627] e0154612 00002064 e01553ed dd9ca66c ddbcc640 ddacc000 0000000a c1340bfc
| [ 0.840633] Call Trace:
| [ 0.840643] [<c101d20e>] ? warn_slowpath_common+0x5e/0x73
| [ 0.840680] [<e011e074>] ? check_crtc_state+0x5f4/0x64a [i915]
| [ 0.840685] [<c101d249>] ? warn_slowpath_fmt+0x26/0x2a
| [ 0.840721] [<e011e074>] ? check_crtc_state+0x5f4/0x64a [i915]
| [ 0.840765] [<e0126d2a>] ? intel_modeset_check_state+0x305/0x54d [i915]
| [ 0.840803] [<e0126fe0>] ? intel_set_mode+0x21/0x2a [i915]
| [ 0.840841] [<e0127d13>] ? intel_get_load_detect_pipe+0x295/0x2e9 [i915]
| [ 0.840884] [<e013ef89>] ? intel_tv_detect+0xc6/0x3b1 [i915]
| [ 0.840893] [<dfef84c4>] ? drm_helper_probe_single_connector_modes+0x97/0x265 [drm_kms_helper]
| [ 0.840900] [<dfef6260>] ? drm_fb_helper_probe_connector_modes+0x32/0x40 [drm_kms_helper]
| [ 0.840907] [<dfef76b9>] ? drm_fb_helper_initial_config+0x148/0x3a9 [drm_kms_helper]
| [ 0.840940] [<e010b6e1>] ? i915_driver_load+0x912/0xa60 [i915]
| [ 0.840959] [<dff890b9>] ? drm_get_pci_dev+0x12e/0x20e [drm]
| [ 0.840966] [<c1129620>] ? pci_device_probe+0x4c/0x83
| [ 0.840974] [<c118bdf1>] ? driver_probe_device+0x7b/0x16d
| [ 0.840979] [<c118bf4f>] ? __driver_attach+0x44/0x5f
| [ 0.840984] [<c118ac13>] ? bus_for_each_dev+0x50/0x5a
| [ 0.840988] [<c118ba8a>] ? driver_attach+0x14/0x17
| [ 0.840993] [<c118bf0b>] ? __device_attach+0x28/0x28
| [ 0.840997] [<c118b785>] ? bus_add_driver+0xc1/0x1b6
| [ 0.841002] [<c118c300>] ? driver_register+0x70/0xc9
| [ 0.841006] [<e0169000>] ? 0xe0168fff
| [ 0.841011] [<c100039e>] ? do_one_initcall+0x6a/0xdf
| [ 0.841018] [<c104688f>] ? load_module+0x1241/0x172d
| [ 0.841023] [<c101884d>] ? vmalloc_sync_all+0xa8/0xa8
| [ 0.841028] [<c1046ded>] ? SyS_init_module+0x72/0x88
| [ 0.841037] [<c124c220>] ? syscall_call+0x7/0xb
| [ 0.841040] ---[ end trace ad1362eaaa8201e6 ]---
`----

See also https://bugs.freedesktop.org/show_bug.cgi?id=65442#c16.

Cheers,
Sven


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