Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753003AbbBWUwM (ORCPT ); Mon, 23 Feb 2015 15:52:12 -0500 Received: from hygieia.santi-shop.eu ([78.46.175.2]:59385 "EHLO hygieia.santi-shop.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752370AbbBWUwK convert rfc822-to-8bit (ORCPT ); Mon, 23 Feb 2015 15:52:10 -0500 Date: Mon, 23 Feb 2015 21:51:55 +0100 From: Bruno =?UTF-8?B?UHLDqW1vbnQ=?= To: Darren Hart Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, Petri Hodju , Bjorn Helgaas , Matthew Garrett Subject: [Patch] apple-gmux: lock iGP IO to protect from vgaarb changes Message-ID: <20150223215155.18444386@neptune.home> X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.25; i686-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4744 Lines: 137 As GMUX depends on IO for iGP to be enabled and active, lock the IO at vgaarb level. This should prevent GPU driver for dGPU to disable IO for iGP while it tries to own legacy VGA IO. This fixes usage of backlight control combined with closed nvidia driver on some Apple dual-GPU (intel/nvidia) systems. On those systems loading nvidia driver disables intel IO decoding, disabling the gmux backlight controls as a side effect. Prior to commits moving boot_vga from (optional) efifb to less optional vgaarb this mis-behavior could be avoided by using right kernel config (efifb enabled but vgaarb disabled). This patch explicitly does not try to trigger vgaarb changes in order to avoid confusing already running graphics drivers. If IO has been mis-configured by vgaarb gmux will thus fail to probe. It is expected to load/probe gmux prior to graphics drivers. Fixes: ce027dac592c0ada241ce0f95ae65856828ac450 # nvidia interaction Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=86121 Reported-by: Petri Hodju Tested-by: Petri Hodju Cc: Bjorn Helgaas Cc: Matthew Garrett Signed-off-by: Bruno Prémont --- drivers/platform/x86/apple-gmux.c | 43 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c index b9429fb..22da6a3 100644 --- a/drivers/platform/x86/apple-gmux.c +++ b/drivers/platform/x86/apple-gmux.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include @@ -31,6 +32,7 @@ struct apple_gmux_data { bool indexed; struct mutex index_lock; + struct pci_dev *pdev; struct backlight_device *bdev; /* switcheroo data */ @@ -415,6 +417,22 @@ static int gmux_resume(struct device *dev) return 0; } +static struct pci_dev *gmux_find_pdev(void) +{ + struct pci_dev *pdev = NULL; + while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev))) { + u16 cmd; + + pci_read_config_word(pdev, PCI_COMMAND, &cmd); + if (!(cmd & PCI_COMMAND_IO)) + continue; + + return pdev; + } + + return NULL; +} + static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) { struct apple_gmux_data *gmux_data; @@ -425,6 +443,7 @@ static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) int ret = -ENXIO; acpi_status status; unsigned long long gpe; + struct pci_dev *pdev = NULL; if (apple_gmux_data) return -EBUSY; @@ -475,7 +494,7 @@ static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) ver_minor = (version >> 16) & 0xff; ver_release = (version >> 8) & 0xff; } else { - pr_info("gmux device not present\n"); + pr_info("gmux device not present or IO disabled\n"); ret = -ENODEV; goto err_release; } @@ -483,6 +502,22 @@ static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor, ver_release, (gmux_data->indexed ? "indexed" : "classic")); + /* + * Apple systems with gmux are EFI based and normally don't use + * VGA. In addition changing IO+MEM ownership between IGP and dGPU + * disables IO/MEM used for backlight control on some systems. + * Lock IO+MEM to GPU with active IO to prevent switch. + */ + pdev = gmux_find_pdev(); + if (pdev && vga_tryget(pdev, + VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM)) { + pr_err("gmux boot_vga IO+MEM vgaarb-locking failed\n"); + ret = -EBUSY; + goto err_release; + } else if (pdev) + pr_info("gmux: locked IO for PCI:%s\n", pci_name(pdev)); + gmux_data->pdev = pdev; + memset(&props, 0, sizeof(props)); props.type = BACKLIGHT_PLATFORM; props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS); @@ -574,6 +609,7 @@ err_enable_gpe: err_notify: backlight_device_unregister(bdev); err_release: + pci_dev_put(pdev); release_region(gmux_data->iostart, gmux_data->iolen); err_free: kfree(gmux_data); @@ -593,6 +629,11 @@ static void gmux_remove(struct pnp_dev *pnp) &gmux_notify_handler); } + if (gmux_data->pdev) { + vga_put(gmux_data->pdev, + VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM); + pci_dev_put(gmux_data->pdev); + } backlight_device_unregister(gmux_data->bdev); release_region(gmux_data->iostart, gmux_data->iolen); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/