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[34.78.140.88]) by smtp.gmail.com with ESMTPSA id p21-20020a05600c359500b0040e3488f16dsm42457536wmq.12.2024.01.23.07.34.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Jan 2024 07:34:38 -0800 (PST) From: Tudor Ambarus To: broonie@kernel.org, andi.shyti@kernel.org, arnd@arndb.de Cc: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, alim.akhtar@samsung.com, linux-spi@vger.kernel.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org, andre.draszik@linaro.org, peter.griffin@linaro.org, semen.protsenko@linaro.org, kernel-team@android.com, willmcvicker@google.com, Tudor Ambarus Subject: [PATCH 15/21] spi: s3c64xx: simplify s3c64xx_wait_for_pio() Date: Tue, 23 Jan 2024 15:34:14 +0000 Message-ID: <20240123153421.715951-16-tudor.ambarus@linaro.org> X-Mailer: git-send-email 2.43.0.429.g432eaa2c6b-goog In-Reply-To: <20240123153421.715951-1-tudor.ambarus@linaro.org> References: <20240123153421.715951-1-tudor.ambarus@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" s3c64xx_spi_transfer_one() makes sure that for PIO the xfer->len is always smaller than the fifo size. Clean s3c64xx_wait_for_pio() and emphasize that it works with lengths smaller than the fifo size. Signed-off-by: Tudor Ambarus --- drivers/spi/spi-s3c64xx.c | 75 +++++++++------------------------------ 1 file changed, 17 insertions(+), 58 deletions(-) diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index fd0e62ff8968..f5474f3b3920 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -484,26 +484,6 @@ static int s3c64xx_enable_datapath(struct s3c64xx_spi_= driver_data *sdd, return 0; } =20 -static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sd= d, - int timeout_ms) -{ - void __iomem *regs =3D sdd->regs; - unsigned long val =3D 1; - u32 status; - u32 max_fifo =3D FIFO_DEPTH(sdd); - - if (timeout_ms) - val =3D msecs_to_loops(timeout_ms); - - do { - status =3D readl(regs + S3C64XX_SPI_STATUS); - } while (FIELD_GET(S3C64XX_SPI_ST_RX_FIFO_LVL, status) < max_fifo && - --val); - - /* return the actual received data length */ - return FIELD_GET(S3C64XX_SPI_ST_RX_FIFO_LVL, status); -} - static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd, struct spi_transfer *xfer) { @@ -547,13 +527,11 @@ static int s3c64xx_wait_for_pio(struct s3c64xx_spi_dr= iver_data *sdd, struct spi_transfer *xfer, bool use_irq) { void __iomem *regs =3D sdd->regs; + u8 *buf =3D xfer->rx_buf; + unsigned long time_us; unsigned long val; - u32 status; - int loops; - u32 cpy_len; - u8 *buf; + u32 status, len; int ms; - unsigned long time_us; =20 /* microsecs to xfer 'len' bytes @ 'cur_speed' */ time_us =3D (xfer->len * 8 * 1000 * 1000) / sdd->cur_speed; @@ -576,48 +554,29 @@ static int s3c64xx_wait_for_pio(struct s3c64xx_spi_dr= iver_data *sdd, status =3D readl(regs + S3C64XX_SPI_STATUS); } while (FIELD_GET(S3C64XX_SPI_ST_RX_FIFO_LVL, status) < xfer->len && --val); - if (!val) return -EIO; =20 /* If it was only Tx */ - if (!xfer->rx_buf) { + if (!buf) { sdd->state &=3D ~TXBUSY; return 0; } =20 - /* - * If the receive length is bigger than the controller fifo - * size, calculate the loops and read the fifo as many times. - * loops =3D length / max fifo size (calculated by using the - * fifo mask). - * For any size less than the fifo size the below code is - * executed atleast once. - */ - loops =3D xfer->len / FIFO_DEPTH(sdd); - buf =3D xfer->rx_buf; - do { - /* wait for data to be received in the fifo */ - cpy_len =3D s3c64xx_spi_wait_for_timeout(sdd, - (loops ? ms : 0)); - - switch (sdd->cur_bpw) { - case 32: - ioread32_rep(regs + S3C64XX_SPI_RX_DATA, - buf, cpy_len / 4); - break; - case 16: - ioread16_rep(regs + S3C64XX_SPI_RX_DATA, - buf, cpy_len / 2); - break; - default: - ioread8_rep(regs + S3C64XX_SPI_RX_DATA, - buf, cpy_len); - break; - } + len =3D FIELD_GET(S3C64XX_SPI_ST_RX_FIFO_LVL, status); + + switch (sdd->cur_bpw) { + case 32: + ioread32_rep(regs + S3C64XX_SPI_RX_DATA, buf, len / 4); + break; + case 16: + ioread16_rep(regs + S3C64XX_SPI_RX_DATA, buf, len / 2); + break; + default: + ioread8_rep(regs + S3C64XX_SPI_RX_DATA, buf, len); + break; + } =20 - buf =3D buf + cpy_len; - } while (loops--); sdd->state &=3D ~RXBUSY; =20 return 0; --=20 2.43.0.429.g432eaa2c6b-goog