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 E9E7DC19F2D for ; Sat, 6 Aug 2022 21:38:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231490AbiHFViQ (ORCPT ); Sat, 6 Aug 2022 17:38:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229740AbiHFViP (ORCPT ); Sat, 6 Aug 2022 17:38:15 -0400 Received: from mail-qk1-x730.google.com (mail-qk1-x730.google.com [IPv6:2607:f8b0:4864:20::730]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE53FB1CB; Sat, 6 Aug 2022 14:38:13 -0700 (PDT) Received: by mail-qk1-x730.google.com with SMTP id o1so4166653qkg.9; Sat, 06 Aug 2022 14:38:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc; bh=MfKNCdoirxc2xo2dJ2ZnrKHYVycXxfrXH8JNH8fm1Y8=; b=YBzle4Bzk8bMM2eG1wG0QftAx91m2KHC2NzsZY+bkn3ddnh1U940M/jxSnYcV7UjIc pKdr3JCm6dxKjr9Hb2YoyGGOlso4bztjd2UILk6zq6O2FGtlS2u6FlMhyadpHXVi+OQ4 VLFnXJt0xdQYzrfMfNi5GuvEG+2nm5LIWyd/WwVe/+vURptktX6hP5gZ+kqvBnq5GW/x uOYMEySPd9JJ4EjR9eel8ie2TJuDeTQgonSosqk441GIXY39IMjaq9ezX4siGpJPGaNe dumUqe4+XqL9xkAHhTVD7Bi6ZhQIocYnNbNY/wY9R8aWANkblzYAgHFibHzxlMWRpxl6 C9vw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc; bh=MfKNCdoirxc2xo2dJ2ZnrKHYVycXxfrXH8JNH8fm1Y8=; b=jhXM5SpUEo1eSYdwewxz8vqPPgQxhOtjLvk2RQ9XT9GeovHojp1n8IyQhoWaoDt351 NtFkS1z8g9qheIUKE14Z81XNPmrjf/+qQSIV4EMzYCoGYkiniaxgrSVXmggwBtGIzxWG 0ig8eQpBDnnFvtH/Mj/FUGC79hnEDLtp0XPC+iceRWD9Wd9L5uOzN6rXhtmfbBy0zcZ1 dIjmLThx4kmW0zhugu+YCSgfQEBxFTOlsUBOxlUVjktITgacOobFYRiFQ+IfNQjTnsvJ ketooLWNvWJdU4KyJVMx2JbcC3DO7GnQzi/ios7D9k2wPtuBMJduQfF4itSX+fvQAt2k 2Xhg== X-Gm-Message-State: ACgBeo3rPao2uXUDYvenAs/rDHa+mMWQbEiQmDPj36DVQZAO7IEcw+QD PX9Hg1x/2sUV7resEc7qTaNHSevmmAo3RY6VfL8= X-Google-Smtp-Source: AA6agR56Da74aJjiF+4nLUKRTvJqjbVZJG6Bbd44zgX3ASwhuBBjAStAwYDAMCCSp6ij5AOPtil/tLlaj2OWYcKKILA= X-Received: by 2002:a05:620a:8018:b0:6b6:5df:977 with SMTP id ee24-20020a05620a801800b006b605df0977mr9477710qkb.320.1659821892589; Sat, 06 Aug 2022 14:38:12 -0700 (PDT) MIME-Version: 1.0 References: <20220806163255.10404-1-markuss.broks@gmail.com> <20220806163255.10404-4-markuss.broks@gmail.com> In-Reply-To: <20220806163255.10404-4-markuss.broks@gmail.com> From: Andy Shevchenko Date: Sat, 6 Aug 2022 23:37:35 +0200 Message-ID: Subject: Re: [PATCH v2 3/3] efi: earlycon: Add support for generic framebuffers and move to console subsystem To: Markuss Broks Cc: Linux Kernel Mailing List , ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org, Jonathan Corbet , Ard Biesheuvel , Greg Kroah-Hartman , Jiri Slaby , Helge Deller , "Paul E. McKenney" , Borislav Petkov , Kees Cook , Andrew Morton , Randy Dunlap , Damien Le Moal , Thomas Zimmermann , Michal Suchanek , Javier Martinez Canillas , Arnd Bergmann , Maarten Lankhorst , Wei Ming Chen , Bartlomiej Zolnierkiewicz , Tony Lindgren , Linux Documentation List , linux-efi , "open list:SERIAL DRIVERS" , "open list:FRAMEBUFFER LAYER" , dri-devel Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org On Sat, Aug 6, 2022 at 6:38 PM Markuss Broks wrote: > > Add early console support for generic linear framebuffer devices. > This driver supports probing from cmdline early parameters > or from the device-tree using information in simple-framebuffer node. > The EFI functionality should be retained in whole. > The driver was disabled on ARM because of a bug in early_ioremap We refer to functions like func(). > implementation on ARM and on IA64 because of lack of early_memremap_prot. Ditto. ... > +#include Can it be placed after linux/* ones? > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include ... > +static int __init simplefb_earlycon_remap_fb(void) > +{ > + unsigned long mapping; + Blank line. > + /* bail if there is no bootconsole or it has been disabled already */ > + if (!earlycon_console || !(earlycon_console->flags & CON_ENABLED)) > + return 0; > + > + if (region_intersects(info.phys_base, info.size, > + IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE) == REGION_INTERSECTS) > + mapping = MEMREMAP_WB; > + else > + mapping = MEMREMAP_WC; > + info.virt_base = memremap(info.phys_base, info.size, mapping); > + > + return info.virt_base ? 0 : -ENOMEM; Easier to read the standard pattern: if (!info.virt_base) return -ENOMEM; return 0; > +} ... > +static void simplefb_earlycon_write_char(u8 *dst, unsigned char c, unsigned int h) > +{ > + const u8 *src; > + int m, n, bytes; > + u8 x; > + > + bytes = BITS_TO_BYTES(font->width); > + src = font->data + c * font->height * bytes + h * bytes; > + > + for (m = 0; m < font->width; m++) { > + n = m % 8; > + x = *(src + m / 8); I would write it as x = src[m / 8]; > + if ((x >> (7 - n)) & 1) > + memset(dst, 0xff, (info.depth / 8)); Too many parentheses. > + else > + memset(dst, 0, (info.depth / 8)); Ditto. > + dst += (info.depth / 8); Ditto. > + } > +} -- With Best Regards, Andy Shevchenko