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received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: 2y+xCrMpiMr3ToPD2xXw0xvdY5Y568QEQ9gnmwXgc+KUenmAS93iS+uPVm7xIwsR0JgFTwDeXQ98t+ADOUHqiX7M+3D8Jx+TZdqR19vRdm8AyO0TNHsXMT04/6f1oMVdh0s/gQQTWZ/LUeOjfvQmKpbC9R2I23YX4uEL/bwJXVLsGYhIpCxVFFp68NVk6dDe9I4+L9iBzFdD/8rntiXWkF6zdczURByAaFbfKgno0xqo/Mx2flLKqzPwETCA3BnIAzJiRTcuLUK2aWarE0R8xe4G4XYBEDeK9fVaX0+sQ5A0TyotNqh2J497vnn+SJtlNbX6tDly7n3QqYhg9ymms6TY4DYMzR6MxVG5WOyMWDo= 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: 08b0333b-a1d4-478f-cf8a-08d639867df3 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Oct 2018 07:58:32.4003 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR04MB5176 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Remove Reset operation in fsl_lpspi_config(). This RST may cause both CLK and CS pins go from high to low level under cs-gpio mode. Add fsl_lpspi_reset() function after one message transfer to clear all flags in use. Signed-off-by: Xiaoning Wang Reviewed-by: Fugang Duan --- V2: - Wrong place to remove fsl_lpspi_txfifo_empty() code when I split patch from my work git tree Although the final code which after applying all these five patches is correct. --- drivers/spi/spi-fsl-lpspi.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c index 1be29daa9f92..3a7fe1c83aaa 100644 --- a/drivers/spi/spi-fsl-lpspi.c +++ b/drivers/spi/spi-fsl-lpspi.c @@ -282,10 +282,6 @@ static int fsl_lpspi_config(struct fsl_lpspi_data *fsl= _lpspi) u32 temp; int ret; =20 - temp =3D CR_RST; - writel(temp, fsl_lpspi->base + IMX7ULP_CR); - writel(0, fsl_lpspi->base + IMX7ULP_CR); - if (!fsl_lpspi->is_slave) { ret =3D fsl_lpspi_set_bitrate(fsl_lpspi); if (ret) @@ -376,6 +372,21 @@ static int fsl_lpspi_wait_for_completion(struct spi_co= ntroller *controller) return 0; } =20 +static int fsl_lpspi_reset(struct fsl_lpspi_data *fsl_lpspi) +{ + u32 temp; + + /* W1C for all flags in SR */ + temp =3D 0x3F << 8; + writel(temp, fsl_lpspi->base + IMX7ULP_SR); + + /* Clear FIFO and disable module */ + temp =3D CR_RRF | CR_RTF; + writel(temp, fsl_lpspi->base + IMX7ULP_CR); + + return 0; +} + static int fsl_lpspi_transfer_one(struct spi_controller *controller, struct spi_device *spi, struct spi_transfer *t) @@ -397,6 +408,8 @@ static int fsl_lpspi_transfer_one(struct spi_controller= *controller, if (ret) return ret; =20 + fsl_lpspi_reset(fsl_lpspi); + return 0; } =20 --=20 2.17.1