From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D92EC28B2B for ; Fri, 19 Aug 2022 16:44:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353833AbiHSQoh (ORCPT ); Fri, 19 Aug 2022 12:44:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32864 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353778AbiHSQkw (ORCPT ); Fri, 19 Aug 2022 12:40:52 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EC558124F1C; Fri, 19 Aug 2022 09:09:17 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id BB00CB8281F; Fri, 19 Aug 2022 16:08:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14A40C433D7; Fri, 19 Aug 2022 16:08:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660925316; bh=2/L29mzLUGWxBty/CKSXc4bgzSJhfSHaQ+Q+8OtgU8I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e+7S0pEoHbH3hDG5tNr79SOFPqRC1BUi+/4Q6Uk4A3RmmUMgdUF3ityAJIujttrOt 2CLa4ZmY2e9jFcBWW/OU/E/9++DEHhggvlaXEgi5sjElQalypI9TpORF3E4RIb0ciD JlmC6drGyCev3U1dhg3dKdfzPiwNb0mS14L1URYc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julien STEPHAN , Mattijs Korpershoek , AngeloGioacchino Del Regno , Chun-Kuang Hu , Sasha Levin Subject: [PATCH 5.10 453/545] drm/mediatek: Allow commands to be sent during video mode Date: Fri, 19 Aug 2022 17:43:43 +0200 Message-Id: <20220819153849.669537539@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220819153829.135562864@linuxfoundation.org> References: <20220819153829.135562864@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Julien STEPHAN [ Upstream commit 81cc7e51c4f1686b71e30046437056ece6b2cb4d ] Mipi dsi panel drivers can use mipi_dsi_dcs_{set,get}_display_brightness() to request backlight changes. This can be done during panel initialization (dsi is in command mode) or afterwards (dsi is in Video Mode). When the DSI is in Video Mode, all commands are rejected. Detect current DSI mode in mtk_dsi_host_transfer() and switch modes temporarily to allow commands to be sent. Signed-off-by: Julien STEPHAN Signed-off-by: Mattijs Korpershoek Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Chun-Kuang Hu Signed-off-by: Sasha Levin --- drivers/gpu/drm/mediatek/mtk_dsi.c | 33 ++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index f39785934999..9d54bb6aec30 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -910,24 +910,33 @@ static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host, u8 read_data[16]; void *src_addr; u8 irq_flag = CMD_DONE_INT_FLAG; + u32 dsi_mode; + int ret; - if (readl(dsi->regs + DSI_MODE_CTRL) & MODE) { - DRM_ERROR("dsi engine is not command mode\n"); - return -EINVAL; + dsi_mode = readl(dsi->regs + DSI_MODE_CTRL); + if (dsi_mode & MODE) { + mtk_dsi_stop(dsi); + ret = mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500); + if (ret) + goto restore_dsi_mode; } if (MTK_DSI_HOST_IS_READ(msg->type)) irq_flag |= LPRX_RD_RDY_INT_FLAG; - if (mtk_dsi_host_send_cmd(dsi, msg, irq_flag) < 0) - return -ETIME; + ret = mtk_dsi_host_send_cmd(dsi, msg, irq_flag); + if (ret) + goto restore_dsi_mode; - if (!MTK_DSI_HOST_IS_READ(msg->type)) - return 0; + if (!MTK_DSI_HOST_IS_READ(msg->type)) { + recv_cnt = 0; + goto restore_dsi_mode; + } if (!msg->rx_buf) { DRM_ERROR("dsi receive buffer size may be NULL\n"); - return -EINVAL; + ret = -EINVAL; + goto restore_dsi_mode; } for (i = 0; i < 16; i++) @@ -952,7 +961,13 @@ static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host, DRM_INFO("dsi get %d byte data from the panel address(0x%x)\n", recv_cnt, *((u8 *)(msg->tx_buf))); - return recv_cnt; +restore_dsi_mode: + if (dsi_mode & MODE) { + mtk_dsi_set_mode(dsi); + mtk_dsi_start(dsi); + } + + return ret < 0 ? ret : recv_cnt; } static const struct mipi_dsi_host_ops mtk_dsi_ops = { -- 2.35.1