From: Dhruva Gole <d-gole@ti.com>
Date: Wed, 12 Apr 2023 10:58:56 +0000 (+0530)
Subject: spi: cadence-quadspi: Reset CMD_CTRL Reg on cmd r/w completion
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=08b3098eadc7f826c3e6fb9d184cf6d82f5028fe;p=u-boot.git

spi: cadence-quadspi: Reset CMD_CTRL Reg on cmd r/w completion

If one leaves the CQSPI_REG_CMDCTRL in an unclean state this may cause
issues in future command reads. This issue came to light when some flash
reads in STIG mode were coming back dirty.

Co-developed-by: Apurva Nandan <a-nandan@ti.com>
Signed-off-by: Apurva Nandan <a-nandan@ti.com>
Signed-off-by: Dhruva Gole <d-gole@ti.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
---

diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c
index 4c055a0580..9ce2c0f254 100644
--- a/drivers/spi/cadence_qspi_apb.c
+++ b/drivers/spi/cadence_qspi_apb.c
@@ -376,6 +376,9 @@ int cadence_qspi_apb_exec_flash_cmd(void *reg_base, unsigned int reg)
 	if (!cadence_qspi_wait_idle(reg_base))
 		return -EIO;
 
+	/* Flush the CMDCTRL reg after the execution */
+	writel(0, reg_base + CQSPI_REG_CMDCTRL);
+
 	return 0;
 }