/* * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved. * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved. * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; * either version 2, or (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even * the implied warranty of MERCHANTABILITY or FITNESS FOR * A PARTICULAR PURPOSE.See the GNU General Public License * for more details. * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include #include /* * There can only be one set of these, so there's no point in having * them be dynamically allocated... */ #define VIAFB_NUM_I2C 5 static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C]; static struct viafb_dev *i2c_vdev; /* Passed in from core */ static void via_i2c_setscl(void *data, int state) { u8 val; struct via_port_cfg *adap_data = data; unsigned long flags; spin_lock_irqsave(&i2c_vdev->reg_lock, flags); val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0; if (state) val |= 0x20; else val &= ~0x20; switch (adap_data->type) { case VIA_PORT_I2C: val |= 0x01; break; case VIA_PORT_GPIO: val |= 0x82; break; default: printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n"); } via_write_reg(adap_data->io_port, adap_data->ioport_index, val); spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags); } static int via_i2c_getscl(void *data) { struct via_port_cfg *adap_data = data; unsigned long flags; int ret = 0; spin_lock_irqsave(&i2c_vdev->reg_lock, flags); if (adap_data->type == VIA_PORT_GPIO) via_write_reg_mask(adap_data->io_port, adap_data->ioport_index, 0, 0x80); if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08) ret = 1; spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags); return ret; } static int via_i2c_getsda(void *data) { struct via_port_cfg *adap_data = data; unsigned long flags; int ret = 0; spin_lock_irqsave(&i2c_vdev->reg_lock, flags); if (adap_data->type == VIA_PORT_GPIO) via_write_reg_mask(adap_data->io_port, adap_data->ioport_index, 0, 0x40); if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04) ret = 1; spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags); return ret; } static void via_i2c_setsda(void *data, int state) { u8 val; struct via_port_cfg *adap_data = data; unsigned long flags; spin_lock_irqsave(&i2c_vdev->reg_lock, flags); val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0; if (state) val |= 0x10; else val &= ~0x10; switch (adap_data->type) { case VIA_PORT_I2C: val |= 0x01; break; case VIA_PORT_GPIO: val |= 0x42; break; default: printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n"); } via_write_reg(adap_data->io_port, adap_data->ioport_index, val); spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags); } int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata) { int ret; u8 mm1[] = {0x00}; struct i2c_msg msgs[2]; if (!via_i2c_par[adap].is_active) return -ENODEV; *pdata = 0; msgs[0].flags = 0; msgs[1].flags = I2C_M_RD; msgs[0].addr = msgs[1].addr = slave_addr / 2; mm1[0] = index; msgs[0].len = 1; msgs[1].len = 1; msgs[0].buf = mm1; msgs[1].buf = pdata; ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2); if (ret == 2) ret = 0; else if (ret >= 0) ret = -EIO; return ret; } int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data) { int ret; u8 msg[2] = { index, data }; struct i2c_msg msgs; if (!via_i2c_par[adap].is_active) return -ENODEV; msgs.flags = 0; msgs.addr = slave_addr / 2; msgs.len = 2; msgs.buf = msg; ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1); if (ret == 1) ret = 0; else if (ret >= 0) ret = -EIO; return ret; } int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len) { int ret; u8 mm1[] = {0x00}; struct i2c_msg msgs[2]; if (!via_i2c_par[adap].is_active) return -ENODEV; msgs[0].flags = 0; msgs[1].flags = I2C_M_RD; msgs[0].addr = msgs[1].addr = slave_addr / 2; mm1[0] = index; msgs[0].len = 1; msgs[1].len = buff_len; msgs[0].buf = mm1; msgs[1].buf = buff; ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2); if (ret == 2) ret = 0; else if (ret >= 0) ret = -EIO; return ret; } /* * Allow other viafb subdevices to look up a specific adapter * by port name. */ struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which) { struct via_i2c_stuff *stuff = &via_i2c_par[which]; return &stuff->adapter; } EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter); static int create_i2c_bus(struct i2c_adapter *adapter, struct i2c_algo_bit_data *algo, struct via_port_cfg *adap_cfg, struct pci_dev *pdev) { algo->setsda = via_i2c_setsda; algo->setscl = via_i2c_setscl; algo->getsda = via_i2c_getsda; algo->getscl = via_i2c_getscl; algo->udelay = 10; algo->timeout = 2; algo->data = adap_cfg; sprintf(adapter->name, "viafb i2c io_port idx 0x%02x", adap_cfg->ioport_index); adapter->owner = THIS_MODULE; adapter->class = I2C_CLASS_DDC; adapter->algo_data = algo; if (pdev) adapter->dev.parent = &pdev->dev; else adapter->dev.parent = NULL; /* i2c_set_adapdata(adapter, adap_cfg); */ /* Raise SCL and SDA */ via_i2c_setsda(adap_cfg, 1); via_i2c_setscl(adap_cfg, 1); udelay(20); return i2c_bit_add_bus(adapter); } static int viafb_i2c_probe(struct platform_device *platdev) { int i, ret; struct via_port_cfg *configs; i2c_vdev = platdev->dev.platform_data; configs = i2c_vdev->port_cfg; for (i = 0; i < VIAFB_NUM_PORTS; i++) { struct via_port_cfg *adap_cfg = configs++; struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i]; i2c_stuff->is_active = 0; if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C) continue; ret = create_i2c_bus(&i2c_stuff->adapter, &i2c_stuff->algo, adap_cfg, NULL); /* FIXME: PCIDEV */ if (ret < 0) { printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n", i, ret); continue; /* Still try to make the rest */ } i2c_stuff->is_active = 1; } return 0; } static int viafb_i2c_remove(struct platform_device *platdev) { int i; for (i = 0; i < VIAFB_NUM_PORTS; i++) { struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i]; /* * Only remove those entries in the array that we've * actually used (and thus initialized algo_data) */ if (i2c_stuff->is_active) i2c_del_adapter(&i2c_stuff->adapter); } return 0; } static struct platform_driver via_i2c_driver = { .driver = { .name = "viafb-i2c", }, .probe = viafb_i2c_probe, .remove = viafb_i2c_remove, }; int viafb_i2c_init(void) { return platform_driver_register(&via_i2c_driver); } void viafb_i2c_exit(void) { platform_driver_unregister(&via_i2c_driver); } 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 'tools/build/tests/ex/arch/Build')