From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1265CA0FE9 for ; Mon, 4 Sep 2023 19:58:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237066AbjIDT6P (ORCPT ); Mon, 4 Sep 2023 15:58:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237330AbjIDT6O (ORCPT ); Mon, 4 Sep 2023 15:58:14 -0400 Received: from out-210.mta1.migadu.com (out-210.mta1.migadu.com [95.215.58.210]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6298DE42 for ; Mon, 4 Sep 2023 12:57:54 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1693857472; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=F94OEAVhjRPNan81JT9jYKc/35rAAkFMKn0HnOUomvI=; b=GnSWs3Th21KoWg3GlauP3qiIOfTQOIrowoSQabwTLw+lmR60Zkz6STabaEZAnjCGxkeJj7 3JZwsA+Ed49UQWdSv8QN1222rpeBrwhEKmFkowFHEmI3Xv35ckwzuofdSFTolilLKKXFoF 0kP5vMu/6Z3tploGLiaOXmyG8Od7rYc= From: Sui Jingfeng To: Bjorn Helgaas Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-pci@vger.kernel.org, Sui Jingfeng Subject: [RFC,drm-misc-next v4 8/9] drm/hibmc: Register as a VGA client by calling vga_client_register() Date: Tue, 5 Sep 2023 03:57:23 +0800 Message-Id: <20230904195724.633404-9-sui.jingfeng@linux.dev> In-Reply-To: <20230904195724.633404-1-sui.jingfeng@linux.dev> References: <20230904195724.633404-1-sui.jingfeng@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Sui Jingfeng Because the display controller in the Hibmc chip is a VGA compatible display controller. Because ARM64 doesn't need the VGA console. It does not need to worry about the side effects that come with the VGA compatible. However, the real problem is that some ARM64 PCs and servers do not have good UEFI firmware support. At least, it is not as good as UEFI firmware for x86. The Huawei KunPeng 920 PC and Taishan 100 server are examples. When a discrete GPU is mounted on such machines, the UEFI firmware still selects the integrated display controller (in the BMC) as the primary GPU. It is hardcoded, no options are provided for selection. A Linux user has no control at all. Signed-off-by: Sui Jingfeng --- drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c index 8a98fa276e8a..73a3f1cb109a 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c @@ -13,6 +13,7 @@ #include #include +#include #include #include @@ -27,6 +28,10 @@ #include "hibmc_drm_drv.h" #include "hibmc_drm_regs.h" +static int hibmc_modeset = -1; +MODULE_PARM_DESC(modeset, "Disable/Enable modesetting"); +module_param_named(modeset, hibmc_modeset, int, 0400); + DEFINE_DRM_GEM_FOPS(hibmc_fops); static irqreturn_t hibmc_interrupt(int irq, void *arg) @@ -299,6 +304,14 @@ static int hibmc_load(struct drm_device *dev) return ret; } +static bool hibmc_want_to_be_primary(struct pci_dev *pdev) +{ + if (hibmc_modeset == 10) + return true; + + return false; +} + static int hibmc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { @@ -339,6 +352,8 @@ static int hibmc_pci_probe(struct pci_dev *pdev, goto err_unload; } + vga_client_register(pdev, NULL, hibmc_want_to_be_primary); + drm_fbdev_generic_setup(dev, 32); return 0; -- 2.34.1