/* * Copyright (C) 2012-2013, Analog Devices Inc. * Author: Lars-Peter Clausen * * Licensed under the GPL-2. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define AXI_SPDIF_REG_CTRL 0x0 #define AXI_SPDIF_REG_STAT 0x4 #define AXI_SPDIF_REG_TX_FIFO 0xc #define AXI_SPDIF_CTRL_TXDATA BIT(1) #define AXI_SPDIF_CTRL_TXEN BIT(0) #define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8 #define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8) #define AXI_SPDIF_FREQ_44100 (0x0 << 6) #define AXI_SPDIF_FREQ_48000 (0x1 << 6) #define AXI_SPDIF_FREQ_32000 (0x2 << 6) #define AXI_SPDIF_FREQ_NA (0x3 << 6) struct axi_spdif { struct regmap *regmap; struct clk *clk; struct clk *clk_ref; struct snd_dmaengine_dai_dma_data dma_data; struct snd_ratnum ratnum; struct snd_pcm_hw_constraint_ratnums rate_constraints; }; static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); unsigned int val; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: val = AXI_SPDIF_CTRL_TXDATA; break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: val = 0; break; default: return -EINVAL; } regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, AXI_SPDIF_CTRL_TXDATA, val); return 0; } static int axi_spdif_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); unsigned int rate = params_rate(params); unsigned int clkdiv, stat; switch (params_rate(params)) { case 32000: stat = AXI_SPDIF_FREQ_32000; break; case 44100: stat = AXI_SPDIF_FREQ_44100; break; case 48000: stat = AXI_SPDIF_FREQ_48000; break; default: stat = AXI_SPDIF_FREQ_NA; break; } clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref), rate * 64 * 2) - 1; clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET; regmap_write(spdif->regmap, AXI_SPDIF_REG_STAT, stat); regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, AXI_SPDIF_CTRL_CLKDIV_MASK, clkdiv); return 0; } static int axi_spdif_dai_probe(struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL); return 0; } static int axi_spdif_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); int ret; ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &spdif->rate_constraints); if (ret) return ret; ret = clk_prepare_enable(spdif->clk_ref); if (ret) return ret; regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN); return 0; } static void axi_spdif_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, AXI_SPDIF_CTRL_TXEN, 0); clk_disable_unprepare(spdif->clk_ref); } static const struct snd_soc_dai_ops axi_spdif_dai_ops = { .startup = axi_spdif_startup, .shutdown = axi_spdif_shutdown, .trigger = axi_spdif_trigger, .hw_params = axi_spdif_hw_params, }; static struct snd_soc_dai_driver axi_spdif_dai = { .probe = axi_spdif_dai_probe, .playback = { .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_KNOT, .formats = SNDRV_PCM_FMTBIT_S16_LE, }, .ops = &axi_spdif_dai_ops, }; static const struct snd_soc_component_driver axi_spdif_component = { .name = "axi-spdif", }; static const struct regmap_config axi_spdif_regmap_config = { .reg_bits = 32, .reg_stride = 4, .val_bits = 32, .max_register = AXI_SPDIF_REG_STAT, }; static int axi_spdif_probe(struct platform_device *pdev) { struct axi_spdif *spdif; struct resource *res; void __iomem *base; int ret; spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL); if (!spdif) return -ENOMEM; platform_set_drvdata(pdev, spdif); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base, &axi_spdif_regmap_config); if (IS_ERR(spdif->regmap)) return PTR_ERR(spdif->regmap); spdif->clk = devm_clk_get(&pdev->dev, "axi"); if (IS_ERR(spdif->clk)) return PTR_ERR(spdif->clk); spdif->clk_ref = devm_clk_get(&pdev->dev, "ref"); if (IS_ERR(spdif->clk_ref)) return PTR_ERR(spdif->clk_ref); ret = clk_prepare_enable(spdif->clk); if (ret) return ret; spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO; spdif->dma_data.addr_width = 4; spdif->dma_data.maxburst = 1; spdif->ratnum.num = clk_get_rate(spdif->clk_ref) / 128; spdif->ratnum.den_step = 1; spdif->ratnum.den_min = 1; spdif->ratnum.den_max = 64; spdif->rate_constraints.rats = &spdif->ratnum; spdif->rate_constraints.nrats = 1; ret = devm_snd_soc_register_component(&pdev->dev, &axi_spdif_component, &axi_spdif_dai, 1); if (ret) goto err_clk_disable; ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); if (ret) goto err_clk_disable; return 0; err_clk_disable: clk_disable_unprepare(spdif->clk); return ret; } static int axi_spdif_dev_remove(struct platform_device *pdev) { struct axi_spdif *spdif = platform_get_drvdata(pdev); clk_disable_unprepare(spdif->clk); return 0; } static const struct of_device_id axi_spdif_of_match[] = { { .compatible = "adi,axi-spdif-tx-1.00.a", }, {}, }; MODULE_DEVICE_TABLE(of, axi_spdif_of_match); static struct platform_driver axi_spdif_driver = { .driver = { .name = "axi-spdif", .of_match_table = axi_spdif_of_match, }, .probe = axi_spdif_probe, .remove = axi_spdif_dev_remove, }; module_platform_driver(axi_spdif_driver); MODULE_AUTHOR("Lars-Peter Clausen "); MODULE_DESCRIPTION("AXI SPDIF driver"); MODULE_LICENSE("GPL"); 5_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/wireless/lib80211_crypt_ccmp.c')