From patchwork Tue Jul 19 14:49:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 591811 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 05BD2C433EF for ; Tue, 19 Jul 2022 14:49:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235040AbiGSOtn (ORCPT ); Tue, 19 Jul 2022 10:49:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239452AbiGSOtR (ORCPT ); Tue, 19 Jul 2022 10:49:17 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3C2BEEAC; Tue, 19 Jul 2022 07:49:16 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.92,284,1650898800"; d="scan'208";a="126656675" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 19 Jul 2022 23:49:16 +0900 Received: from localhost.localdomain (unknown [10.226.92.160]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 27854400C4DD; Tue, 19 Jul 2022 23:49:12 +0900 (JST) From: Biju Das To: Mark Brown Cc: Biju Das , linux-spi@vger.kernel.org, Vinod Koul , Geert Uytterhoeven , Chris Paterson , Biju Das , Prabhakar Mahadev Lad , linux-renesas-soc@vger.kernel.org Subject: [PATCH 2/2] spi: spi-rspi: Add need_dmar_clr to spi_ops Date: Tue, 19 Jul 2022 15:49:06 +0100 Message-Id: <20220719144906.382548-2-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220719144906.382548-1-biju.das.jz@bp.renesas.com> References: <20220719144906.382548-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org RSPI IP on RZ/{A, G2L} SoC's has the same signal for both interrupt and DMA transfer request. Setting DMARS register for DMA transfer makes the signal to work as a DMA transfer request signal and subsequent interrupt requests to the interrupt controller are masked. Currently, DMA to interrupt mode switching does not work because of this masking. This patch adds need_dmar_clr device configuration flag to spi_ops and it makes the signal to work as an interrupt request by clearing DMARS after DMA callback. Signed-off-by: Biju Das --- drivers/spi/spi-rspi.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 7a014eeec2d0..8637be53bb8d 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -249,6 +249,7 @@ struct spi_ops { u16 flags; u16 fifo_size; u8 num_hw_ss; + bool need_dmar_clr; }; static void rspi_set_rate(struct rspi_data *rspi) @@ -613,6 +614,12 @@ static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx, rspi->dma_callbacked, HZ); if (ret > 0 && rspi->dma_callbacked) { ret = 0; + if (need_dmar_clr) { + if (tx) + dmaengine_synchronize(rspi->ctlr->dma_tx); + if (rx) + dmaengine_synchronize(rspi->ctlr->dma_rx); + } } else { if (!ret) { dev_err(&rspi->ctlr->dev, "DMA timeout\n"); @@ -1196,6 +1203,7 @@ static const struct spi_ops rspi_rz_ops = { .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX, .fifo_size = 8, /* 8 for TX, 32 for RX */ .num_hw_ss = 1, + .need_dmar_clr = true, }; static const struct spi_ops qspi_ops = {