On ti, 2016-04-19 at 13:48 +0530, Ramalingam C wrote:
> Retriving the horizontal timings from the port registers as
> part of get_config()
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
I saw the crash below with current -nightly on a BXT-M board and Jani
pointed me to these two patches which get rid of it, so
Acked-by: Imre Deak <imre.deak@xxxxxxxxx>
[ 56.916557] divide error: 0000 [#1] PREEMPT SMP
[ 56.921741] Modules linked in: i915(+) drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm intel_gtt agpgart cf
g80211 rfkill binfmt_misc ax88179_178a kvm_intel kvm irqbypass crc32c_intel efivars tpm_tis tpm fuse
[ 56.944106] CPU: 3 PID: 1097 Comm: modprobe Not tainted 4.6.0-rc4+ #433
[ 56.951501] Hardware name: Intel Corp. Broxton M/RVP, BIOS BXT1RVPA.X64.0131.B30.1604142217 04/14/2016
[ 56.961908] task: ffff88007a854d00 ti: ffff88007aea0000 task.ti: ffff88007aea0000
[ 56.970273] RIP: 0010:[<ffffffffa01235b2>] [<ffffffffa01235b2>] drm_mode_hsync+0x22/0x40 [drm]
[ 56.980043] RSP: 0018:ffff88007aea3788 EFLAGS: 00010206
[ 56.985982] RAX: 000000000788b600 RBX: ffff880073c22108 RCX: 0000000000000000
[ 56.993957] RDX: 0000000000000000 RSI: ffff88007ab06800 RDI: ffff880073c22108
[ 57.001935] RBP: ffff88007aea3788 R08: 0000000000000001 R09: ffff880073c221e8
[ 57.009903] R10: ffff880073c22108 R11: 0000000000000001 R12: ffff88007a300000
[ 57.017872] R13: ffff880073c22000 R14: ffff880175f78000 R15: ffff880175f78798
[ 57.025849] FS: 00007f105d3e6700(0000) GS:ffff88017fd80000(0000) knlGS:0000000000000000
[ 57.034894] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 57.041317] CR2: 00007f4d485101d0 CR3: 000000007a820000 CR4: 00000000003406e0
[ 57.049292] Stack:
[ 57.051539] ffff88007aea37a0 ffffffffa043b632 ffff880175f787c8 ffff88007aea3810
[ 57.059825] ffffffffa043d59e ffff880175f787b0 ffff88007ab68c00 ffff88007aea37f0
[ 57.068128] ffff880073c221e8 ffff880073c22108 ffff880175f78780 ffff880100000000
[ 57.076430] Call Trace:
[ 57.079254] [<ffffffffa043b632>] intel_mode_from_pipe_config+0x82/0xb0 [i915]
[ 57.087405] [<ffffffffa043d59e>] intel_modeset_setup_hw_state+0x55e/0xd60 [i915]
[ 57.095847] [<ffffffffa043ff94>] intel_modeset_init+0x8e4/0x1630 [i915]
[ 57.103415] [<ffffffffa047bcf0>] i915_driver_load+0xbe0/0x1980 [i915]
[ 57.110745] [<ffffffffa0116c19>] drm_dev_register+0xa9/0xc0 [drm]
[ 57.117681] [<ffffffffa011921d>] drm_get_pci_dev+0x8d/0x1e0 [drm]
[ 57.124600] [<ffffffff8195f942>] ? _raw_spin_unlock_irqrestore+0x42/0x70
[ 57.132253] [<ffffffffa03b0384>] i915_pci_probe+0x34/0x50 [i915]
[ 57.139070] [<ffffffff8149c375>] local_pci_probe+0x45/0xa0
[ 57.145303] [<ffffffff8149d300>] ? pci_match_device+0xe0/0x110
[ 57.151924] [<ffffffff8149d6cb>] pci_device_probe+0xdb/0x130
[ 57.158355] [<ffffffff81579b93>] driver_probe_device+0x223/0x440
[ 57.165169] [<ffffffff81579e85>] __driver_attach+0xd5/0x100
[ 57.171500] [<ffffffff81579db0>] ? driver_probe_device+0x440/0x440
[ 57.178510] [<ffffffff81577736>] bus_for_each_dev+0x66/0xa0
[ 57.184841] [<ffffffff815793de>] driver_attach+0x1e/0x20
[ 57.190881] [<ffffffff81578d6e>] bus_add_driver+0x1ee/0x280
[ 57.197212] [<ffffffff8157abc0>] driver_register+0x60/0xe0
[ 57.203447] [<ffffffff8149bc50>] __pci_register_driver+0x60/0x70
[ 57.210285] [<ffffffffa0119450>] drm_pci_init+0xe0/0x110 [drm]
[ 57.216911] [<ffffffff810dcd8d>] ? trace_hardirqs_on+0xd/0x10
[ 57.223434] [<ffffffffa023a000>] ? 0xffffffffa023a000
[ 57.229237] [<ffffffffa023a092>] i915_init+0x92/0x99 [i915]
[ 57.235570] [<ffffffff810003db>] do_one_initcall+0xab/0x1d0
[ 57.241900] [<ffffffff810f9eef>] ? rcu_read_lock_sched_held+0x7f/0x90
[ 57.249205] [<ffffffff81204f18>] ? kmem_cache_alloc_trace+0x248/0x2b0
[ 57.256509] [<ffffffff811a5eee>] ? do_init_module+0x27/0x1d9
[ 57.262934] [<ffffffff811a5f26>] do_init_module+0x5f/0x1d9
[ 57.269167] [<ffffffff8112392f>] load_module+0x20ef/0x27b0
[ 57.275401] [<ffffffff8111f8e0>] ? store_uevent+0x40/0x40
[ 57.281541] [<ffffffff81124243>] SYSC_finit_module+0xc3/0xf0
[ 57.287969] [<ffffffff8112428e>] SyS_finit_module+0xe/0x10
[ 57.294203] [<ffffffff81960069>] entry_SYSCALL_64_fastpath+0x1c/0xac
[ 57.301406] Code: ff 5d c3 66 0f 1f 44 00 00 0f 1f 44 00 00 8b 87 d8 00 00 00 55 48 89 e5 85 c0 75 22 8b 4f 68 85 c9 78 1b 69 47 58 e8 03 00 00 99 <f7> f9 b9 d3 4d 62 10 05 f4 01 00 00 f7 e1 89 d0 c1 e8 06 5d c3
[ 57.322964] RIP [<ffffffffa01235b2>] drm_mode_hsync+0x22/0x40 [drm]
[ 57.330103] RSP <ffff88007aea3788>
[ 57.334276] ---[ end trace d414224cb2e2a4cf ]---
[ 57.339861] modprobe (1097) used greatest stack depth: 12048 bytes left
> ---
> drivers/gpu/drm/i915/intel_dsi.c | 44 ++++++++++++++++++++++++++++++++------
> 1 file changed, 37 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index 9ff6435..e0259e6 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -46,6 +46,14 @@ static const struct {
> },
> };
>
> +/* return pixels equvalent to txbyteclkhs */
> +static u16 pixels_from_txbyteclkhs(u16 clk_hs, int bpp, int lane_count,
> + u16 burst_mode_ratio)
> +{
> + return DIV_ROUND_UP((clk_hs * lane_count * 8 * 100),
> + (bpp * burst_mode_ratio));
> +}
> +
> enum mipi_dsi_pixel_format pixel_format_from_register_bits(u32 fmt)
> {
> /* It just so happens the VBT matches register contents. */
> @@ -772,9 +780,10 @@ static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
> struct drm_display_mode *adjusted_mode =
> &pipe_config->base.adjusted_mode;
> struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> + unsigned int lane_count = intel_dsi->lane_count;
> unsigned int bpp, fmt;
> enum port port;
> - u16 vfp, vsync, vbp;
> + u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
>
> /*
> * Atleast one port is active as encoder->get_config called only if
> @@ -799,22 +808,43 @@ static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
> adjusted_mode->crtc_vtotal =
> I915_READ(BXT_MIPI_TRANS_VTOTAL(port));
>
> + hactive = adjusted_mode->crtc_hdisplay;
> + hfp = I915_READ(MIPI_HFP_COUNT(port));
> +
> /*
> - * TODO: Retrieve hfp, hsync and hbp. Adjust them for dual link and
> - * calculate hsync_start, hsync_end, htotal and hblank_end
> + * Meaningful for video mode non-burst sync pulse mode only,
> + * can be zero for non-burst sync events and burst modes
> */
> + hsync = I915_READ(MIPI_HSYNC_PADDING_COUNT(port));
> + hbp = I915_READ(MIPI_HBP_COUNT(port));
> +
> + /* harizontal values are in terms of high speed byte clock */
> + hfp = pixels_from_txbyteclkhs(hfp, bpp, lane_count,
> + intel_dsi->burst_mode_ratio);
> + hsync = pixels_from_txbyteclkhs(hsync, bpp, lane_count,
> + intel_dsi->burst_mode_ratio);
> + hbp = pixels_from_txbyteclkhs(hbp, bpp, lane_count,
> + intel_dsi->burst_mode_ratio);
> +
> + if (intel_dsi->dual_link) {
> + hfp *= 2;
> + hsync *= 2;
> + hbp *= 2;
> + }
>
> /* vertical values are in terms of lines */
> vfp = I915_READ(MIPI_VFP_COUNT(port));
> vsync = I915_READ(MIPI_VSYNC_PADDING_COUNT(port));
> vbp = I915_READ(MIPI_VBP_COUNT(port));
>
> + adjusted_mode->crtc_htotal = hactive + hfp + hsync + hbp;
> + adjusted_mode->crtc_hsync_start = hfp + adjusted_mode->crtc_hdisplay;
> + adjusted_mode->crtc_hsync_end = hsync + adjusted_mode->crtc_hsync_start;
> adjusted_mode->crtc_hblank_start = adjusted_mode->crtc_hdisplay;
> + adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_htotal;
>
> - adjusted_mode->crtc_vsync_start =
> - vfp + adjusted_mode->crtc_vdisplay;
> - adjusted_mode->crtc_vsync_end =
> - vsync + adjusted_mode->crtc_vsync_start;
> + adjusted_mode->crtc_vsync_start = vfp + adjusted_mode->crtc_vdisplay;
> + adjusted_mode->crtc_vsync_end = vsync + adjusted_mode->crtc_vsync_start;
> adjusted_mode->crtc_vblank_start = adjusted_mode->crtc_vdisplay;
> adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vtotal;
> }
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