From patchwork Tue May 18 08:28:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 12264279 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF1C5C433B4 for ; Tue, 18 May 2021 09:06:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C652761209 for ; Tue, 18 May 2021 09:06:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347768AbhERJHi (ORCPT ); Tue, 18 May 2021 05:07:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347707AbhERJHS (ORCPT ); Tue, 18 May 2021 05:07:18 -0400 Received: from xavier.telenet-ops.be (xavier.telenet-ops.be [IPv6:2a02:1800:120:4::f00:14]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 52106C06138F for ; Tue, 18 May 2021 02:05:57 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed20:c161:a89e:52bd:1787]) by xavier.telenet-ops.be with bizsmtp id 695s2500Q446CkP0195sBf; Tue, 18 May 2021 11:05:55 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1livfk-006q2F-4x; Tue, 18 May 2021 11:05:52 +0200 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1liv5J-0069nz-PT; Tue, 18 May 2021 10:28:13 +0200 From: Geert Uytterhoeven To: Maxime Ripard , David Airlie , Daniel Vetter Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 5/5] video: fbdev: ssd1307fb: Cache address ranges Date: Tue, 18 May 2021 10:28:09 +0200 Message-Id: <20210518082809.1467549-6-geert@linux-m68k.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210518082809.1467549-1-geert@linux-m68k.org> References: <20210518082809.1467549-1-geert@linux-m68k.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Cache the column and page ranges, to avoid doing unneeded I2C transfers when the values haven't changed. Signed-off-by: Geert Uytterhoeven --- drivers/video/fbdev/ssd1307fb.c | 52 +++++++++++++++++++++++---------- 1 file changed, 36 insertions(+), 16 deletions(-) diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c index 8e3d4be74723b9bf..23b43ce479898813 100644 --- a/drivers/video/fbdev/ssd1307fb.c +++ b/drivers/video/fbdev/ssd1307fb.c @@ -82,6 +82,11 @@ struct ssd1307fb_par { struct regulator *vbat_reg; u32 vcomh; u32 width; + /* Cached address ranges */ + u8 col_start; + u8 col_end; + u8 page_start; + u8 page_end; }; struct ssd1307fb_array { @@ -160,28 +165,43 @@ static int ssd1307fb_set_address_range(struct ssd1307fb_par *par, u8 col_start, int ret; /* Set column range */ - ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE); - if (ret < 0) - return ret; + if (col_start != par->col_start || col_end != par->col_end) { + ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE); + if (ret < 0) + return ret; - ret = ssd1307fb_write_cmd(par->client, col_start); - if (ret < 0) - return ret; + ret = ssd1307fb_write_cmd(par->client, col_start); + if (ret < 0) + return ret; - ret = ssd1307fb_write_cmd(par->client, col_end); - if (ret < 0) - return ret; + ret = ssd1307fb_write_cmd(par->client, col_end); + if (ret < 0) + return ret; + + par->col_start = col_start; + par->col_end = col_end; + } /* Set page range */ - ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE); - if (ret < 0) - return ret; + if (page_start != par->page_start || page_end != par->page_end) { + ret = ssd1307fb_write_cmd(par->client, + SSD1307FB_SET_PAGE_RANGE); + if (ret < 0) + return ret; - ret = ssd1307fb_write_cmd(par->client, page_start); - if (ret < 0) - return ret; + ret = ssd1307fb_write_cmd(par->client, page_start); + if (ret < 0) + return ret; + + ret = ssd1307fb_write_cmd(par->client, page_end); + if (ret < 0) + return ret; - return ssd1307fb_write_cmd(par->client, page_end); + par->page_start = page_start; + par->page_end = page_end; + } + + return 0; } static int ssd1307fb_update_rect(struct ssd1307fb_par *par, unsigned int x,