From: Chee Hong Ang chee.hong.ang@intel.com
QSPI driver perform chip select on every flash read/write access. The driver need to disable/enable the QSPI controller while performing chip select. This may cause some data lost especially the QSPI controller is configured to run at slower speed as it may take longer time to access the flash device. This patch prevent the driver from disable/enable the QSPI controller too soon and inadvertently halting any ongoing flash read/write access by ensuring the QSPI controller is always in idle mode after each read/write access.
Signed-off-by: Chee Hong Ang chee.hong.ang@intel.com Signed-off-by: Ooi, Joyce joyce.ooi@intel.com --- drivers/spi/cadence_qspi_apb.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c index 55a7501..ab14a5f 100644 --- a/drivers/spi/cadence_qspi_apb.c +++ b/drivers/spi/cadence_qspi_apb.c @@ -676,6 +676,10 @@ int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat, writel(CQSPI_REG_INDIRECTRD_DONE, plat->regbase + CQSPI_REG_INDIRECTRD);
+ /* Wait til QSPI is idle */ + if (!cadence_qspi_wait_idle(plat->regbase)) + return -EIO; + return 0;
failrd: @@ -782,6 +786,11 @@ int cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata *plat, plat->regbase + CQSPI_REG_INDIRECTWR); if (bounce_buf) free(bounce_buf); + + /* Wait til QSPI is idle */ + if (!cadence_qspi_wait_idle(plat->regbase)) + return -EIO; + return 0;
failwr: