commit 2410974084fef2b9c03890347093a3a78a0f57e7
author Ashok Reddy Soma <ashok.reddy.soma@xilinx.com> Fri Jul 15 19:31:19 2022 +0530
committer Michal Simek <michal.simek@amd.com> Tue Jul 26 09:34:21 2022 +0200
tree 852732e3a6aed34836e1e6650eda62cbbe02eeb2
parent 525a8e46b61feb55a4239ecd4a0a976afd70ed19

spi: zynq_qspi: Fix programming qspi speed

When programming qspi flash speed we need to check the requested flash
speed not to exceed the spi max frequency. In the current implementation
we are checking qspi ref clk instead. This commit fixes the issue by
checking the requested speed and programs the specified max frequency.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/1657893679-20039-5-git-send-email-ashok.reddy.soma@xilinx.com
Signed-off-by: Michal Simek <michal.simek@amd.com>

drivers/spi/zynq_qspi.c

diff --git a/drivers/spi/zynq_qspi.c b/drivers/spi/zynq_qspi.c
index 52db7b3..00e3ffc 100644
--- a/drivers/spi/zynq_qspi.c
+++ b/drivers/spi/zynq_qspi.c
@@ -622,15 +622,12 @@
 	uint32_t confr;
 	u8 baud_rate_val = 0;
 
-	if (speed > plat->frequency)
-		speed = plat->frequency;
+	if (!speed || speed > priv->max_hz)
+		speed = priv->max_hz;
 
 	/* Set the clock frequency */
 	confr = readl(&regs->cr);
-	if (speed == 0) {
-		/* Set baudrate x8, if the freq is 0 */
-		baud_rate_val = 0x2;
-	} else if (plat->speed_hz != speed) {
+	if (plat->speed_hz != speed) {
 		while ((baud_rate_val < ZYNQ_QSPI_CR_BAUD_MAX) &&
 		       ((plat->frequency /
 		       (2 << baud_rate_val)) > speed))