From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B3C53922F for ; Wed, 7 Jun 2023 21:00:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DD9F7C433D2; Wed, 7 Jun 2023 21:00:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1686171616; bh=QXOmpFfrX6WqPjEMMraE5Lk9ZwBNgRHBGUmGtOqvR3Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F8ZI2YuHN61kPKrkyAg89lUxbNRyMTikjpfnifC/mMQl0A1+yJLzi26hYeHGfQY0M Az5YMkZkViBMEyzyYr8h37bOTpDRIDgDbrHHvoPepscGbYEJlfTUUJNpNj710TfFPS V9ba8l4bELDYmMr+bdke+0V2FXQNw8SByzBUKHqo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jammy Huang , Thomas Zimmermann , Sasha Levin Subject: [PATCH 5.15 045/159] drm/ast: Fix ARM compatibility Date: Wed, 7 Jun 2023 22:15:48 +0200 Message-ID: <20230607200905.162455675@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230607200903.652580797@linuxfoundation.org> References: <20230607200903.652580797@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jammy Huang [ Upstream commit 4327a6137ed43a091d900b1ac833345d60f32228 ] ARM architecture only has 'memory', so all devices are accessed by MMIO if possible. Signed-off-by: Jammy Huang Reviewed-by: Thomas Zimmermann Signed-off-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20230421003354.27767-1-jammy_huang@aspeedtech.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/ast/ast_main.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c index 79a3618679554..754a08c92d3d1 100644 --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -423,11 +423,12 @@ struct ast_private *ast_device_create(const struct drm_driver *drv, return ERR_PTR(-EIO); /* - * If we don't have IO space at all, use MMIO now and - * assume the chip has MMIO enabled by default (rev 0x20 - * and higher). + * After AST2500, MMIO is enabled by default, and it should be adopted + * to be compatible with Arm. */ - if (!(pci_resource_flags(pdev, 2) & IORESOURCE_IO)) { + if (pdev->revision >= 0x40) { + ast->ioregs = ast->regs + AST_IO_MM_OFFSET; + } else if (!(pci_resource_flags(pdev, 2) & IORESOURCE_IO)) { drm_info(dev, "platform has no IO space, trying MMIO\n"); ast->ioregs = ast->regs + AST_IO_MM_OFFSET; } -- 2.39.2