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Tue, 10 Nov 2026 16:25:53 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id uM4yLZFF82o0HwAAD6G6ig (envelope-from ); Tue, 10 Nov 2026 16:25:53 +0000 Message-ID: <31fdcc5a-c944-43cf-9390-60e8cdd964ed@suse.de> Date: Tue, 10 Nov 2026 17:25:53 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/6] LoongArch: efi: Provide sysfb_primary_display for screen_info users To: wuqianhai@loongson.cn, chenhuacai@kernel.org, kernel@xen0n.name, deller@gmx.de, bhelgaas@google.com Cc: ardb@kernel.org, ilias.apalodimas@linaro.org, javierm@redhat.com, loongarch@lists.linux.dev, linux-pci@vger.kernel.org, linux-efi@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20261029033440.973077-1-wuqianhai@loongson.cn> <20261110085617.2626835-1-wuqianhai@loongson.cn> <20261110085617.2626835-2-wuqianhai@loongson.cn> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-13.29 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; XM_UA_NO_VERSION(0.01)[]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_TO(0.00)[loongson.cn,kernel.org,xen0n.name,gmx.de,google.com]; ARC_NA(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmx.de]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; URIBL_BLOCKED(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:url,loongson.cn:email]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_TWELVE(0.00)[14]; RCVD_TLS_ALL(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:url,loongson.cn:email,imap1.dmz-prg2.suse.org:helo] X-Spam-Score: -13.29 X-Spam-Level: X-Spam-Flag: NO Hi Am 10.11.26 um 09:56 schrieb wuqianhai@loongson.cn: > From: wuqianhai > > LoongArch defines and initializes sysfb_primary_display only when > CONFIG_SYSFB or CONFIG_EFI_EARLYCON is enabled. The PCI VGA arbiter and > the framebuffer console need the firmware framebuffer information through > screen_info whenever CONFIG_SCREEN_INFO is enabled, even if neither of > those options is set. > > Drop the guards so sysfb_primary_display is always defined and > initialized, and its EFI stub alias is always provided, mirroring x86. > This avoids selecting SYSFB just to obtain the symbol. The idea is that you select SYSFB is you're interested in that information.  I guess we could make sysfb_primary_display available if CONFIG_VGA_ARB=y. Best regards Thomas > > Signed-off-by: wuqianhai > --- > arch/loongarch/kernel/efi.c | 5 +---- > arch/loongarch/kernel/image-vars.h | 2 -- > 2 files changed, 1 insertion(+), 6 deletions(-) > > diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c > index 69dd83f8082f..e491a82b2e0d 100644 > --- a/arch/loongarch/kernel/efi.c > +++ b/arch/loongarch/kernel/efi.c > @@ -74,10 +74,8 @@ bool efi_poweroff_required(void) > > unsigned long __initdata primary_display_table = EFI_INVALID_TABLE_ADDR; > > -#if defined(CONFIG_SYSFB) || defined(CONFIG_EFI_EARLYCON) > struct sysfb_display_info sysfb_primary_display __section(".data"); > EXPORT_SYMBOL_GPL(sysfb_primary_display); > -#endif > > static void __init init_primary_display(void) > { > @@ -129,8 +127,7 @@ void __init efi_init(void) > > set_bit(EFI_CONFIG_TABLES, &efi.flags); > > - if (IS_ENABLED(CONFIG_EFI_EARLYCON) || IS_ENABLED(CONFIG_SYSFB)) > - init_primary_display(); > + init_primary_display(); > > if (boot_memmap == EFI_INVALID_TABLE_ADDR) > return; > diff --git a/arch/loongarch/kernel/image-vars.h b/arch/loongarch/kernel/image-vars.h > index e557ebd46c2b..4d1d7978553a 100644 > --- a/arch/loongarch/kernel/image-vars.h > +++ b/arch/loongarch/kernel/image-vars.h > @@ -11,9 +11,7 @@ __efistub_strcmp = strcmp; > __efistub_kernel_entry = kernel_entry; > __efistub_kernel_asize = kernel_asize; > __efistub_kernel_fsize = kernel_fsize; > -#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB) > __efistub_sysfb_primary_display = sysfb_primary_display; > -#endif > > #endif > -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Stefan Gaiser, Jochen Jaser, Abhinav Puri, (HRB 36809, AG Nürnberg)