From patchwork Fri Mar 11 10:25:24 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Deepak M X-Patchwork-Id: 8564171 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A66EA9F6E4 for ; Fri, 11 Mar 2016 10:25:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B610E20259 for ; Fri, 11 Mar 2016 10:25:24 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id A11B820219 for ; Fri, 11 Mar 2016 10:25:23 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id ADC366E0B0; Fri, 11 Mar 2016 10:25:18 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id 0C4EE6E0B0 for ; Fri, 11 Mar 2016 10:25:16 +0000 (UTC) Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP; 11 Mar 2016 02:25:16 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,320,1455004800"; d="scan'208";a="667618154" Received: from unknown (HELO mdeepakubuntudesk01-desktop.iind.intel.com) ([10.223.26.119]) by FMSMGA003.fm.intel.com with ESMTP; 11 Mar 2016 02:25:15 -0800 From: Deepak M To: intel-gfx@lists.freedesktop.org Date: Fri, 11 Mar 2016 15:55:24 +0530 Message-Id: <1457691925-10655-1-git-send-email-m.deepak@intel.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Cc: Deepak M , Jani Nikula Subject: [Intel-gfx] [PATCH 1/2] drm/i915: Get the i2c bus number from the ACPI X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently for executing the i2c MIPI sequence, we are relaying on the i2c bus bunmber which is specified in the VBT. But there are cases where different Fab versions of the board will drive the same chip with different i2c port, in which case the i2c bus number from the VBT cant be relied on. To overcome this the i2c bus number is read from the BIOS acpi table; BIOS can detect the Fab version in runtime and will store the correct i2c bus number in the ACPI table. v2 by Deepak: - Reading the i2c from the ACPI and storing them in list Cc: Jani Nikula Cc: Ville Syrjälä Signed-off-by: Deepak M --- drivers/gpu/drm/i915/i915_dma.c | 2 ++ drivers/gpu/drm/i915/i915_drv.h | 11 ++++++++ drivers/gpu/drm/i915/intel_acpi.c | 59 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 72 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 4aa3db6..57be99b 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -387,6 +387,8 @@ static int i915_load_modeset_init(struct drm_device *dev) intel_register_dsm_handler(); + intel_acpi_find_i2c(dev_priv); + ret = vga_switcheroo_register_client(dev->pdev, &i915_switcheroo_ops, false); if (ret) goto cleanup_vga_client; diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index f37ac12..5c6279d 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -41,6 +41,7 @@ #include "intel_lrc.h" #include "i915_gem_gtt.h" #include "i915_gem_render_state.h" +#include #include #include #include @@ -1739,6 +1740,12 @@ struct intel_wm_config { bool sprites_scaled; }; +struct acpi_i2c_data_node { + struct list_head head; + int i2c_bus_number; + int i2c_slave_address; +}; + struct drm_i915_private { struct drm_device *dev; struct kmem_cache *objects; @@ -1823,6 +1830,8 @@ struct drm_i915_private { /* backlight registers and fields in struct intel_panel */ struct mutex backlight_lock; + struct list_head acpi_i2c_list; + /* LVDS info */ bool no_aux_handshake; @@ -1892,6 +1901,7 @@ struct drm_i915_private { struct i915_workarounds workarounds; + /* Reclocking support */ bool render_reclock_avail; @@ -3439,6 +3449,7 @@ intel_opregion_notify_adapter(struct drm_device *dev, pci_power_t state) #ifdef CONFIG_ACPI extern void intel_register_dsm_handler(void); extern void intel_unregister_dsm_handler(void); +extern acpi_status intel_acpi_find_i2c(struct drm_i915_private *dev_priv); #else static inline void intel_register_dsm_handler(void) { return; } static inline void intel_unregister_dsm_handler(void) { return; } diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c index eb638a1..afe42ab 100644 --- a/drivers/gpu/drm/i915/intel_acpi.c +++ b/drivers/gpu/drm/i915/intel_acpi.c @@ -110,6 +110,65 @@ static void intel_dsm_platform_mux_info(void) ACPI_FREE(pkg); } +static int i2c_acpi_get_name(struct acpi_resource *ares, void *data) +{ + struct drm_i915_private *dev_priv = data; + struct acpi_resource_i2c_serialbus *sb; + unsigned int val; + char *resource; + int error; + + + if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { + sb = &ares->data.i2c_serial_bus; + + if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) { + struct acpi_i2c_data_node *i2c_entry = NULL; + + resource = sb->resource_source.string_ptr; + resource = strstr(resource, "I2C"); + error = kstrtouint(resource+3, 0, &val); + if (error) + return error; + + i2c_entry = kzalloc(sizeof(struct acpi_i2c_data_node), + GFP_NOWAIT); + i2c_entry->i2c_bus_number = val; + i2c_entry->i2c_slave_address = sb->slave_address; + + list_add_tail(&i2c_entry->head, + &dev_priv->acpi_i2c_list); + } + } + + return 1; +} + +acpi_status intel_acpi_find_i2c(struct drm_i915_private *dev_priv) +{ + struct pci_dev *pdev = dev_priv->dev->pdev; + struct list_head resource_list; + struct acpi_device *adev; + acpi_handle dhandle; + + dhandle = ACPI_HANDLE(&pdev->dev); + if (!dhandle) + return false; + + if (acpi_bus_get_device(dhandle, &adev)) + return AE_OK; + if (acpi_bus_get_status(adev) || !adev->status.present) + return AE_OK; + + INIT_LIST_HEAD(&resource_list); + INIT_LIST_HEAD(&dev_priv->acpi_i2c_list); + acpi_dev_get_resources(adev, &resource_list, + i2c_acpi_get_name, dev_priv); + acpi_dev_free_resource_list(&resource_list); + + return AE_OK; +} + static bool intel_dsm_pci_probe(struct pci_dev *pdev) { acpi_handle dhandle;