From patchwork Fri Feb 11 03:49:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Lin X-Patchwork-Id: 12742818 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 1E486C433F5 for ; Fri, 11 Feb 2022 03:49:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236995AbiBKDtu (ORCPT ); Thu, 10 Feb 2022 22:49:50 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:36618 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236927AbiBKDtt (ORCPT ); Thu, 10 Feb 2022 22:49:49 -0500 Received: from mail-m17664.qiye.163.com (mail-m17664.qiye.163.com [59.111.176.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABE0926E7; Thu, 10 Feb 2022 19:49:48 -0800 (PST) Received: from localhost.localdomain (unknown [58.22.7.114]) by mail-m17664.qiye.163.com (Hmail) with ESMTPA id B89EF14017A; Fri, 11 Feb 2022 11:49:46 +0800 (CST) From: Jon Lin To: broonie@kernel.org Cc: heiko@sntech.de, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, Jon Lin Subject: [RFC PATCH v1 2/6] spi: rockchip: Preset cs-high and clk polarity in setup progress Date: Fri, 11 Feb 2022 11:49:34 +0800 Message-Id: <20220211034938.25097-3-jon.lin@rock-chips.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220211034938.25097-1-jon.lin@rock-chips.com> References: <20220211034938.25097-1-jon.lin@rock-chips.com> X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgPGg8OCBgUHx5ZQUlOS1dZCBgUCR5ZQVlLVUtZV1 kWDxoPAgseWUFZKDYvK1lXWShZQUhPN1dZLVlBSVdZDwkaFQgSH1lBWRoeT0JWGEoYH0xOQh5JGE xPVRMBExYaEhckFA4PWVdZFhoPEhUdFFlBWVVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OiI6Qgw6Hj5WKB4fTUgrDTwi SQlPFBZVSlVKTU9PTk5KSENMSk5OVTMWGhIXVREUFVUXEhU7CRQYEFYYExILCFUYFBZFWVdZEgtZ QVlOQ1VJSVVMVUpKT1lXWQgBWUFJQ01NNwY+ X-HM-Tid: 0a7ee6e6b726da2fkuwsb89ef14017a Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org After power up, the cs and clock is in default status, and the cs-high and clock polarity dts property configuration will take no effect until the calling of rockchip_spi_config in the first transmission. So preset them to make sure a correct voltage before the first transmission coming. Signed-off-by: Jon Lin --- drivers/spi/spi-rockchip.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 7ac07569e103..1738a2611a2b 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -711,6 +711,26 @@ static bool rockchip_spi_can_dma(struct spi_controller *ctlr, return xfer->len / bytes_per_word >= rs->fifo_len; } +static int rockchip_spi_setup(struct spi_device *spi) +{ + struct rockchip_spi *rs = spi_controller_get_devdata(spi->controller); + u32 cr0; + + pm_runtime_get_sync(rs->dev); + + cr0 = readl_relaxed(rs->regs + ROCKCHIP_SPI_CTRLR0); + + cr0 |= ((spi->mode & 0x3) << CR0_SCPH_OFFSET); + if (spi->mode & SPI_CS_HIGH) + cr0 |= BIT(spi->chip_select) << CR0_SOI_OFFSET; + + writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0); + + pm_runtime_put(rs->dev); + + return 0; +} + static int rockchip_spi_probe(struct platform_device *pdev) { int ret; @@ -837,6 +857,7 @@ static int rockchip_spi_probe(struct platform_device *pdev) ctlr->min_speed_hz = rs->freq / BAUDR_SCKDV_MAX; ctlr->max_speed_hz = min(rs->freq / BAUDR_SCKDV_MIN, MAX_SCLK_OUT); + ctlr->setup = rockchip_spi_setup; ctlr->set_cs = rockchip_spi_set_cs; ctlr->transfer_one = rockchip_spi_transfer_one; ctlr->max_transfer_size = rockchip_spi_max_transfer_size;