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received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: xSsW1M8HR5saPfnQNyiSb4cfRebmhfAYhVBgNUo5P9tuWLlYP3pMXwStIz98jYAcArBAkwuXS5CANjkcbOe2qELcgNGE1QmqD3IuIJqOrh8zZODpDBpId+1w3b1yC4bODRSGOFXqL0/W6OO5Af3MGuL/vf9uVZUc3Du88m+FuS7zeF3qWCF5ZI6BJECWXRirGWBRlXdwFq531aTjCYSOugaTDvTCxIdsa8U1bL/ekh+ObS7XtbBoPk8Nzks9rt4C0KcXuDZNW4RV3IUIOW8+YcysL6QHDwk2IM27jxWk0f8xLBhNRgUfGsgjg+AHo6mx8y0rRWSi95ycWDrRtg/Av5t9oXo3Gi0zRAyfPiFRaTE= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: bba12499-7812-44aa-4b5a-08d65beec521 X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Dec 2018 02:50:38.9763 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR04MB4072 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Configure watermark to change with the length of the sent data. Support LPSPI sending message shorter than tx/rxfifosize. Signed-off-by: Clark Wang --- Change log: V2/V3: - No change. --- drivers/spi/spi-fsl-lpspi.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c index cbf165e7bd17..08dcc3c22e88 100644 --- a/drivers/spi/spi-fsl-lpspi.c +++ b/drivers/spi/spi-fsl-lpspi.c @@ -89,6 +89,7 @@ struct fsl_lpspi_data { void (*rx)(struct fsl_lpspi_data *); =20 u32 remain; + u8 watermark; u8 txfifosize; u8 rxfifosize; =20 @@ -235,7 +236,7 @@ static void fsl_lpspi_set_watermark(struct fsl_lpspi_da= ta *fsl_lpspi) { u32 temp; =20 - temp =3D fsl_lpspi->txfifosize >> 1 | (fsl_lpspi->rxfifosize >> 1) << 16; + temp =3D fsl_lpspi->watermark >> 1 | (fsl_lpspi->watermark >> 1) << 16; =20 writel(temp, fsl_lpspi->base + IMX7ULP_FCR); =20 @@ -261,7 +262,8 @@ static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data = *fsl_lpspi) if (prescale =3D=3D 8 && scldiv >=3D 256) return -EINVAL; =20 - writel(scldiv, fsl_lpspi->base + IMX7ULP_CCR); + writel(scldiv | (scldiv << 8) | ((scldiv >> 1) << 16), + fsl_lpspi->base + IMX7ULP_CCR); =20 dev_dbg(fsl_lpspi->dev, "perclk=3D%d, speed=3D%d, prescale =3D%d, scldiv= =3D%d\n", perclk_rate, config.speed_hz, prescale, scldiv); @@ -329,6 +331,11 @@ static void fsl_lpspi_setup_transfer(struct spi_device= *spi, fsl_lpspi->tx =3D fsl_lpspi_buf_tx_u32; } =20 + if (t->len <=3D fsl_lpspi->txfifosize) + fsl_lpspi->watermark =3D t->len; + else + fsl_lpspi->watermark =3D fsl_lpspi->txfifosize; + fsl_lpspi_config(fsl_lpspi); } =20 --=20 2.17.1