From: Boris Brezillon <boris.brezillon@collabora.com>
To: <patrice.chotard@foss.st.com>
Cc: Mark Brown <broonie@kernel.org>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Vignesh Raghavendra <vigneshr@ti.com>,
<linux-mtd@lists.infradead.org>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
<linux-spi@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <christophe.kerello@foss.st.com>
Subject: Re: [PATCH v2 1/3] spi: spi-mem: add automatic poll status functions
Date: Mon, 17 May 2021 09:41:40 +0200 [thread overview]
Message-ID: <20210517094140.53cb643a@collabora.com> (raw)
In-Reply-To: <20210507131756.17028-2-patrice.chotard@foss.st.com>
On Fri, 7 May 2021 15:17:54 +0200
<patrice.chotard@foss.st.com> wrote:
> +/**
> + * spi_mem_poll_status() - Poll memory device status
> + * @mem: SPI memory device
> + * @op: the memory operation to execute
> + * @mask: status bitmask to ckeck
> + * @match: (status & mask) expected value
> + * @timeout_ms: timeout in milliseconds
> + *
> + * This function send a polling status request to the controller driver
> + *
> + * Return: 0 in case of success, -ETIMEDOUT in case of error,
> + * -EOPNOTSUPP if not supported.
> + */
> +int spi_mem_poll_status(struct spi_mem *mem,
> + const struct spi_mem_op *op,
> + u16 mask, u16 match, u16 timeout_ms)
Maybe you should pass a delay_us too, to poll the status at the right
rate in the SW-based case (can also be used by drivers if they need to
configure the polling rate). You could also add an initial_delay_us to
avoid polling the status too early: an erase operation will take longer
than a write which will take longer than a read. No need to check the
status just after issuing the command, especially if the polling is
done in SW. Those 2 arguments should also be passed to the driver.
> +{
> + struct spi_controller *ctlr = mem->spi->controller;
> + unsigned long ms;
> + int ret = -EOPNOTSUPP;
> + int exec_op_ret;
> + u16 *status;
> +
> + if (!spi_mem_supports_op(mem, op))
> + return ret;
> +
> + if (ctlr->mem_ops && ctlr->mem_ops->poll_status) {
> + ret = spi_mem_access_start(mem);
> + if (ret)
> + return ret;
> +
> + reinit_completion(&ctlr->xfer_completion);
> +
> + ret = ctlr->mem_ops->poll_status(mem, op, mask, match,
> + timeout_ms);
> +
> + ms = wait_for_completion_timeout(&ctlr->xfer_completion,
> + msecs_to_jiffies(timeout_ms));
> +
> + spi_mem_access_end(mem);
> + if (!ms)
> + return -ETIMEDOUT;
> + } else {
> + status = (u16 *)op->data.buf.in;
> + ret = read_poll_timeout(spi_mem_exec_op, exec_op_ret,
> + ((*status) & mask) == match, 20,
> + timeout_ms * 1000, false, mem, op);
> + if (exec_op_ret)
> + return exec_op_ret;
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(spi_mem_poll_status);
> +
next prev parent reply other threads:[~2021-05-17 7:42 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-07 13:17 [PATCH v2 0/3] MTD: spinand: Add spi_mem_poll_status() support patrice.chotard
2021-05-07 13:17 ` [PATCH v2 1/3] spi: spi-mem: add automatic poll status functions patrice.chotard
2021-05-08 7:55 ` Boris Brezillon
2021-05-10 8:46 ` Patrice CHOTARD
2021-05-10 9:22 ` Boris Brezillon
2021-05-17 7:29 ` Patrice CHOTARD
2021-05-17 7:41 ` Boris Brezillon [this message]
2021-05-17 9:24 ` Patrice CHOTARD
2021-05-17 11:25 ` Boris Brezillon
2021-05-17 11:59 ` Patrice CHOTARD
2021-05-17 12:24 ` Boris Brezillon
2021-05-17 12:04 ` Patrice CHOTARD
2021-05-07 13:17 ` [PATCH v2 2/3] mtd: spinand: use the spi-mem poll status APIs patrice.chotard
2021-05-07 13:17 ` [PATCH v2 3/3] spi: stm32-qspi: add automatic poll status feature patrice.chotard
2021-05-07 19:29 ` kernel test robot
2021-05-07 22:16 ` kernel test robot
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