From: Patrice Chotard <patrice.chotard@foss.st.com>
Date: Thu, 12 May 2022 07:17:37 +0000 (+0200)
Subject: spi: stm32_qspi: Always check SR_TCF flags in stm32_qspi_wait_cmd()
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=a6d7eeb66db720e77aba587fce6cc88a2003e8ab;p=u-boot.git

spi: stm32_qspi: Always check SR_TCF flags in stm32_qspi_wait_cmd()

Currently, SR_TCF flag is checked in case there is data, this criteria
is not correct.

SR_TCF flags is set when programmed number of bytes have been transferred
to the memory device ("bytes" comprised command and data send to the
SPI device).
So even if there is no data, we must check SR_TCF flag.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
---

diff --git a/drivers/spi/stm32_qspi.c b/drivers/spi/stm32_qspi.c
index 8f4aabc3d1..3c8faecb54 100644
--- a/drivers/spi/stm32_qspi.c
+++ b/drivers/spi/stm32_qspi.c
@@ -150,20 +150,19 @@ static int _stm32_qspi_wait_cmd(struct stm32_qspi_priv *priv,
 	u32 sr;
 	int ret = 0;
 
-	if (op->data.nbytes) {
-		ret = readl_poll_timeout(&priv->regs->sr, sr,
-					 sr & STM32_QSPI_SR_TCF,
-					 STM32_QSPI_CMD_TIMEOUT_US);
-		if (ret) {
-			log_err("cmd timeout (stat:%#x)\n", sr);
-		} else if (readl(&priv->regs->sr) & STM32_QSPI_SR_TEF) {
-			log_err("transfer error (stat:%#x)\n", sr);
-			ret = -EIO;
-		}
-		/* clear flags */
-		writel(STM32_QSPI_FCR_CTCF | STM32_QSPI_FCR_CTEF, &priv->regs->fcr);
+	ret = readl_poll_timeout(&priv->regs->sr, sr,
+				 sr & STM32_QSPI_SR_TCF,
+				 STM32_QSPI_CMD_TIMEOUT_US);
+	if (ret) {
+		log_err("cmd timeout (stat:%#x)\n", sr);
+	} else if (readl(&priv->regs->sr) & STM32_QSPI_SR_TEF) {
+		log_err("transfer error (stat:%#x)\n", sr);
+		ret = -EIO;
 	}
 
+	/* clear flags */
+	writel(STM32_QSPI_FCR_CTCF | STM32_QSPI_FCR_CTEF, &priv->regs->fcr);
+
 	if (!ret)
 		ret = _stm32_qspi_wait_for_not_busy(priv);