From patchwork Tue Jul 27 13:47:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 12402781 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 EABD9C4338F for ; Tue, 27 Jul 2021 13:49:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C3F78619F5 for ; Tue, 27 Jul 2021 13:49:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236922AbhG0Ntm (ORCPT ); Tue, 27 Jul 2021 09:49:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38252 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237050AbhG0Ntg (ORCPT ); Tue, 27 Jul 2021 09:49:36 -0400 Received: from baptiste.telenet-ops.be (baptiste.telenet-ops.be [IPv6:2a02:1800:120:4::f00:13]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 056BFC0619DC for ; Tue, 27 Jul 2021 06:47:37 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed20:b0a9:7e88:5ca4:551a]) by baptiste.telenet-ops.be with bizsmtp id aDnb2500B1fSPfK01DnbQn; Tue, 27 Jul 2021 15:47:35 +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 1m8NQk-001Pc7-W3; Tue, 27 Jul 2021 15:47:34 +0200 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1m8NQk-00Fnhe-FW; Tue, 27 Jul 2021 15:47:34 +0200 From: Geert Uytterhoeven To: Sam Ravnborg , Maxime Ripard Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v2 5/5] video: fbdev: ssd1307fb: Cache address ranges Date: Tue, 27 Jul 2021 15:47:30 +0200 Message-Id: <20210727134730.3765898-6-geert@linux-m68k.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210727134730.3765898-1-geert@linux-m68k.org> References: <20210727134730.3765898-1-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 Acked-by: Sam Ravnborg --- v2: - Add Acked-by, - Rebase. --- drivers/video/fbdev/ssd1307fb.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c index 9aed5ee0094f2d95..1e2f71c2f8a8bc78 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 { @@ -158,6 +163,9 @@ static int ssd1307fb_set_col_range(struct ssd1307fb_par *par, u8 col_start, u8 col_end = col_start + cols - 1; int ret; + if (col_start == par->col_start && col_end == par->col_end) + return 0; + ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE); if (ret < 0) return ret; @@ -166,7 +174,13 @@ static int ssd1307fb_set_col_range(struct ssd1307fb_par *par, u8 col_start, if (ret < 0) return ret; - return ssd1307fb_write_cmd(par->client, col_end); + ret = ssd1307fb_write_cmd(par->client, col_end); + if (ret < 0) + return ret; + + par->col_start = col_start; + par->col_end = col_end; + return 0; } static int ssd1307fb_set_page_range(struct ssd1307fb_par *par, u8 page_start, @@ -175,6 +189,9 @@ static int ssd1307fb_set_page_range(struct ssd1307fb_par *par, u8 page_start, u8 page_end = page_start + pages - 1; int ret; + if (page_start == par->page_start && page_end == par->page_end) + return 0; + ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE); if (ret < 0) return ret; @@ -183,7 +200,13 @@ static int ssd1307fb_set_page_range(struct ssd1307fb_par *par, u8 page_start, if (ret < 0) return ret; - return ssd1307fb_write_cmd(par->client, page_end); + ret = ssd1307fb_write_cmd(par->client, page_end); + if (ret < 0) + return ret; + + par->page_start = page_start; + par->page_end = page_end; + return 0; } static int ssd1307fb_update_rect(struct ssd1307fb_par *par, unsigned int x,