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c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1712329340; 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=D3TlB4DpD1JnUAQGSHUPmeuRrja5TpZ3NixofruQ0EE=; b=EjGfpTRHJNzjvcKzdqxSPjpu/sg6m4z/X/aGKA9zIscyiH46cSFfgFPNyw8gJWAWIQ4xDO mgRbsz+n6Hucfamf0MOLKzGFnk+k77IqGCjNjCXkFN9yR3q6sji+03wz+34xZf4VTra5JV EQ/7vv4Pqblu98yO81vm23fdeKx9P+kKHFjQoNiYML0QEIi3vCLhO9tya5BtQTVpF8d1ks 8X3A/afkl4Ii0y/7g6Qt4VKo3KnO5SA3wN+K86Nx+0qx16JrG/wSROAVUAqnmAqCcu6yoD DUwbW3mN2zvF/MSfHDFUK13BR5plKcOqc2WK3V+je8n2meCRw7VIRfxlcEUFxA== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Fri, 05 Apr 2024 17:02:18 +0200 Subject: [PATCH v2 08/11] spi: cadence-qspi: add early busywait to cqspi_wait_for_bit() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20240405-cdns-qspi-mbly-v2-8-956679866d6d@bootlin.com> References: <20240405-cdns-qspi-mbly-v2-0-956679866d6d@bootlin.com> In-Reply-To: <20240405-cdns-qspi-mbly-v2-0-956679866d6d@bootlin.com> To: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vaishnav Achath , Thomas Bogendoerfer , Rob Herring 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 ebb8c35f50fd..230aad490e03 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; -- 2.44.0