From patchwork Tue Jan 10 05:54:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?WGlubGVpIExlZSAo5p2O5piV56OKKQ==?= X-Patchwork-Id: 13094733 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6E383C54EBE for ; Tue, 10 Jan 2023 06:17:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ncGPgRvysTufZi8LUt0hskEj6uht4e5qpgEiJMfXaMw=; b=NtY2jIZzjV2hLp hfVwYh/QElo77Rw05lpemQeKJH7YvQCLouHhzJ2vd8tWsj0fcd0+oXVBUbLHuqvUcXKsiuz2FxoTP xhFVctLA3OSepqqPSLaASoIFaoO0m+j43w6YvrB+HRkmauXuCgHiWFMPOzDgpUMh7KdiPRvYQaeWp mE9eDfxpY1A4lPlxZMfD2eUsrAQA2VUdcFAGMd7zKEm8rtNN3HkDnxVcMz8Mzv/6CHsCX5Na9KuYo YbapKYh5EKorgtIaS7XUipqRYR0l+RUoQhzmE1raU1+rjfXqgCzlX440OBqyP8eYAuqsaRTkamb86 sTvASgwgw14PWKrmaaig==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pF7vi-005Ryc-0m; Tue, 10 Jan 2023 06:16:14 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pF7ve-005RxQ-Ea; Tue, 10 Jan 2023 06:16:11 +0000 X-UUID: 4354913090ae11ed9febb318cfc39896-20230109 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=LY4G6QzuBSZZIXQ8TTtTbpZjrWuqx7+js+6/78ZfUYM=; b=cVCHp3JtxJne7COAK8VeVtmMNT78Czxb+5iskzVJTeoBp0a5obkmAI5z1iAnOuA6CD769nFRtPj6RG7pbpobkzqJ5o8pZ3m3fJ0DoS2ptxx9+OPXWZrKx9yj/P+JKSxMgdLt0BPSDWI5TlFEq8MIHU17Ez7as6gOHdkjX2kNMWU=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.17,REQID:878033a4-9c26-4246-bc15-afe8ee1d4b39,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:543e81c,CLOUDID:bcf0cc8b-8530-4eff-9f77-222cf6e2895b,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0 X-CID-BVR: 0 X-UUID: 4354913090ae11ed9febb318cfc39896-20230109 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 2051301718; Mon, 09 Jan 2023 23:16:04 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.186) by mtkmbs13n1.mediatek.inc (172.21.101.193) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Tue, 10 Jan 2023 13:54:58 +0800 Received: from mszsdaap41.gcn.mediatek.inc (10.16.6.141) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Tue, 10 Jan 2023 13:54:57 +0800 From: To: , , , , , , , , CC: , , , , , Xinlei Lee Subject: [PATCH v2 1/3] drm/mediatek: dsi: Reduce the time of dsi from LP11 to sending cmd Date: Tue, 10 Jan 2023 13:54:51 +0800 Message-ID: <1673330093-6771-2-git-send-email-xinlei.lee@mediatek.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1673330093-6771-1-git-send-email-xinlei.lee@mediatek.com> References: <1673330093-6771-1-git-send-email-xinlei.lee@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230109_221610_498496_545E1E17 X-CRM114-Status: GOOD ( 14.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Xinlei Lee According to Figure 16 Turnaround Procedure on page 36 in [1], you can see the status of LP-00 -> LP10 -> LP11. This state can correspond to the state of DSI from LP00 -> LP11 in mtk_dsi_lane_ready function in mtk_dsi.c. LP-00 -> LP10 -> LP11 takes about 2*TLPX time (refer to [1] page 51 to see that TLPX is 50ns) The delay at the end of the mtk_dsi_lane_ready function should be greater than the 2*TLPX specified by the DSI spec, and less than the time specified by the DSI_RX (generally 6ms to 40ms), to avoid problems caused by the RX specification [1]:mipi_D-PHY_specification_v1-1 Fixes: 39e8d062b03c ("drm/mediatek: Keep dsi as LP00 before dcs cmds transfer") Signed-off-by: Xinlei Lee Acked-by: Sam Ravnborg Reviewed-by: AngeloGioacchino Del Regno --- drivers/gpu/drm/mediatek/mtk_dsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 3b7d13028fb6..9e1363c9fcdb 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -721,7 +721,7 @@ static void mtk_dsi_lane_ready(struct mtk_dsi *dsi) mtk_dsi_clk_ulp_mode_leave(dsi); mtk_dsi_lane0_ulp_mode_leave(dsi); mtk_dsi_clk_hs_mode(dsi, 0); - msleep(20); + usleep_range(1000, 3000); /* The reaction time after pulling up the mipi signal for dsi_rx */ } }