From patchwork Fri Mar 8 17:18:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Th=C3=A9o_Lebrun?= X-Patchwork-Id: 13587129 Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 26B7A5787D; Fri, 8 Mar 2024 17:18:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.198 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709918312; cv=none; b=mwXQfK6DLNhG40G56kjGfC2aTHbopSZSDTQqkUxbiyqR8Jt3ic/fIZA768WS9Bg6L8hbCobILaiDKTPB1twYQCaLMgudGLFBlXUcRgw/9/NiKEEiHckHSFZxkpPH3eK6E1MnmRIZhsPfVH7pAQnIPynORMq5P04IeBxQjGop0YM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709918312; c=relaxed/simple; bh=JTu/Ri2/gtdgFmXJ0bMlqA5f8zzCSoBcLIvuAlQqjTo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Ea3r1kHGCxCdZDfW68JD5ZH+zeBwb0E2uJaHg76qkCeZsq5Af2JpFyuktuN5kMgTfCJhElXgMcknb7SRBbS9w07v04tskI6NLLw+8wOK9KxuRv45EuvjgzErjC1rtc6/3pR33/jbnFjrbdRn5uQctGUXS1+KWO84yEaD5m9hoVU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=bfnk+POY; arc=none smtp.client-ip=217.70.183.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="bfnk+POY" Received: by mail.gandi.net (Postfix) with ESMTPSA id 59F23C000C; Fri, 8 Mar 2024 17:18:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1709918302; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=snXfAL/ISLez0yxPxF8EY5sTF1V0n6/HA3n4V2ckkr0=; b=bfnk+POYQxg+wF6/DDH5TiggB95GchX4TXSML6GfUQFSuHUXWBV/xCQ79HE3sYNqAJV7pF CrpyIWYL0Walp55NFYvO7PwLpew+nsdJ1FmaDHSqmkLZf0rLMb+4dbqeyXqoAZrkSAmfYu SLbCBf82xPFoHd5fho3lq8+ay3N6HMCNvjPZU/xToMQ6kjMVcz0wmITJ5rt9u48TR3YT94 FhX9/urFdFXj2j7sGpSSK9R656SwmZvzbF+1nyqOWCs3kjL2cG2f+vWwLsNp2bMJDvPraZ PWB4KBWVjSYq/TxTp/84BI+V6ZAFXA6DUZzIZ64KYNQptZjjeYM0fYojSqygqA== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Fri, 08 Mar 2024 18:18:23 +0100 Subject: [PATCH 08/11] spi: cadence-qspi: add early busywait to cqspi_wait_for_bit() Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240308-cdns-qspi-mbly-v1-8-a503856dd205@bootlin.com> References: <20240308-cdns-qspi-mbly-v1-0-a503856dd205@bootlin.com> In-Reply-To: <20240308-cdns-qspi-mbly-v1-0-a503856dd205@bootlin.com> To: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vaishnav Achath , Thomas Bogendoerfer Cc: linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, Vladimir Kondratiev , Gregory CLEMENT , Thomas Petazzoni , Tawfik Bayouk , =?utf-8?q?Th=C3=A9o_Lebrun?= X-Mailer: b4 0.13.0 X-GND-Sasl: theo.lebrun@bootlin.com If the CQSPI_BUSYWAIT_EARLY quirk flag is on, call readl_relaxed_poll_timeout() with no sleep at the start of cqspi_wait_for_bit(). If its short timeout expires, a sleeping readl_relaxed_poll_timeout() call takes the relay. Behavior is hidden behind a quirk flag to keep the previous behavior the same on all platforms. The reason is to avoid hrtimer interrupts on the system. All read operations take less than 100µs. Signed-off-by: Théo Lebrun --- drivers/spi/spi-cadence-quadspi.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index 973ea4edbe3a..2ad9c736f85f 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -44,6 +44,7 @@ static_assert(CQSPI_MAX_CHIPSELECT <= SPI_CS_CNT_MAX); #define CQSPI_NEEDS_APB_AHB_HAZARD_WAR BIT(5) #define CQSPI_DETECT_FIFO_DEPTH BIT(6) #define CQSPI_RD_NO_IRQ BIT(7) +#define CQSPI_BUSYWAIT_EARLY BIT(8) /* Capabilities */ #define CQSPI_SUPPORTS_OCTAL BIT(0) @@ -110,7 +111,7 @@ struct cqspi_st { struct cqspi_driver_platdata { u32 hwcaps_mask; - u8 quirks; + u16 quirks; int (*indirect_read_dma)(struct cqspi_flash_pdata *f_pdata, u_char *rxbuf, loff_t from_addr, size_t n_rx); u32 (*get_dma_status)(struct cqspi_st *cqspi); @@ -121,6 +122,7 @@ struct cqspi_driver_platdata { /* Operation timeout value */ #define CQSPI_TIMEOUT_MS 500 #define CQSPI_READ_TIMEOUT_MS 10 +#define CQSPI_BUSYWAIT_TIMEOUT_US 500 /* Runtime_pm autosuspend delay */ #define CQSPI_AUTOSUSPEND_TIMEOUT 2000 @@ -299,13 +301,27 @@ struct cqspi_driver_platdata { #define CQSPI_REG_VERSAL_DMA_VAL 0x602 -static int cqspi_wait_for_bit(void __iomem *reg, const u32 mask, bool clr) +static int cqspi_wait_for_bit(const struct cqspi_driver_platdata *ddata, + void __iomem *reg, const u32 mask, bool clr, + bool busywait) { + u64 timeout_us = CQSPI_TIMEOUT_MS * USEC_PER_MSEC; u32 val; + if (busywait && ddata && ddata->quirks & CQSPI_BUSYWAIT_EARLY) { + int ret = readl_relaxed_poll_timeout(reg, val, + (((clr ? ~val : val) & mask) == mask), + 0, CQSPI_BUSYWAIT_TIMEOUT_US); + + if (ret != -ETIMEDOUT) + return ret; + + timeout_us -= CQSPI_BUSYWAIT_TIMEOUT_US; + } + return readl_relaxed_poll_timeout(reg, val, (((clr ? ~val : val) & mask) == mask), - 10, CQSPI_TIMEOUT_MS * 1000); + 10, timeout_us); } static bool cqspi_is_idle(struct cqspi_st *cqspi) @@ -435,8 +451,8 @@ static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg) writel(reg, reg_base + CQSPI_REG_CMDCTRL); /* Polling for completion. */ - ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_CMDCTRL, - CQSPI_REG_CMDCTRL_INPROGRESS_MASK, 1); + ret = cqspi_wait_for_bit(cqspi->ddata, reg_base + CQSPI_REG_CMDCTRL, + CQSPI_REG_CMDCTRL_INPROGRESS_MASK, 1, true); if (ret) { dev_err(&cqspi->pdev->dev, "Flash command execution timed out.\n"); @@ -791,8 +807,8 @@ static int cqspi_indirect_read_execute(struct cqspi_flash_pdata *f_pdata, } /* Check indirect done status */ - ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTRD, - CQSPI_REG_INDIRECTRD_DONE_MASK, 0); + ret = cqspi_wait_for_bit(cqspi->ddata, reg_base + CQSPI_REG_INDIRECTRD, + CQSPI_REG_INDIRECTRD_DONE_MASK, 0, true); if (ret) { dev_err(dev, "Indirect read completion error (%i)\n", ret); goto failrd; @@ -1092,8 +1108,8 @@ static int cqspi_indirect_write_execute(struct cqspi_flash_pdata *f_pdata, } /* Check indirect done status */ - ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTWR, - CQSPI_REG_INDIRECTWR_DONE_MASK, 0); + ret = cqspi_wait_for_bit(cqspi->ddata, reg_base + CQSPI_REG_INDIRECTWR, + CQSPI_REG_INDIRECTWR_DONE_MASK, 0, false); if (ret) { dev_err(dev, "Indirect write completion error (%i)\n", ret); goto failwr;