From: Pratyush Yadav Date: Fri, 5 Sep 2025 18:59:56 +0000 (+0530) Subject: spi: cadence-quadspi: Flush posted register writes before DAC access X-Git-Tag: v6.18-rc1~165^2~8^2~2 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1ad55767e77a853c98752ed1e33b68049a243bd7;p=thirdparty%2Fkernel%2Flinux.git spi: cadence-quadspi: Flush posted register writes before DAC access cqspi_read_setup() and cqspi_write_setup() program the address width as the last step in the setup. This is likely to be immediately followed by a DAC region read/write. On TI K3 SoCs the DAC region is on a different endpoint from the register region. This means that the order of the two operations is not guaranteed, and they might be reordered at the interconnect level. It is possible that the DAC read/write goes through before the address width update goes through. In this situation if the previous command used a different address width the OSPI command is sent with the wrong number of address bytes, resulting in an invalid command and undefined behavior. Read back the size register to make sure the write gets flushed before accessing the DAC region. Fixes: 140623410536 ("mtd: spi-nor: Add driver for Cadence Quad SPI Flash Controller") CC: stable@vger.kernel.org Reviewed-by: Pratyush Yadav Signed-off-by: Pratyush Yadav Signed-off-by: Santhosh Kumar K Message-ID: <20250905185958.3575037-3-s-k6@ti.com> Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index eaf9a0f522d50..447a32a08a934 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -719,6 +719,7 @@ static int cqspi_read_setup(struct cqspi_flash_pdata *f_pdata, reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; reg |= (op->addr.nbytes - 1); writel(reg, reg_base + CQSPI_REG_SIZE); + readl(reg_base + CQSPI_REG_SIZE); /* Flush posted write. */ return 0; } @@ -1063,6 +1064,7 @@ static int cqspi_write_setup(struct cqspi_flash_pdata *f_pdata, reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; reg |= (op->addr.nbytes - 1); writel(reg, reg_base + CQSPI_REG_SIZE); + readl(reg_base + CQSPI_REG_SIZE); /* Flush posted write. */ return 0; }