[PATCH v4 04/16] spi: spi-mem: teach spi_mem_adjust_op_freq() about post-config ops

[Santhosh Kumar K]

When a device exposes both a conservative base speed (spi-max-frequency)
and a maximum post-configuration speed (spi-max-post-config-frequency),
operations validated after controller configuration must run at the
higher rate while all others are capped at the base rate.

Extend spi_mem_adjust_op_freq() with a bypass: if op->max_freq equals
post_config_max_speed_hz (the value written by execute_tuning on
success), return immediately leaving op->max_freq unchanged. All other
ops are capped to max_speed_hz, the always-reachable base rate. This
integrates the policy into the single existing frequency-adjustment
point so exec_op(), supports_op(), and calc_op_duration() all behave
consistently.

Signed-off-by: Santhosh Kumar K <s-k6@xxxxxx>
---
 drivers/spi/spi-mem.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index a88b9f038356..e20eca1b8245 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -591,9 +591,18 @@ EXPORT_SYMBOL_GPL(spi_mem_adjust_op_size);
  * Some chips have per-op frequency limitations and must adapt the maximum
  * speed. This function allows SPI mem drivers to set @op->max_freq to the
  * maximum supported value.
+ *
+ * When @mem->spi->post_config_max_speed_hz is set, ops with @op->max_freq
+ * equal to that value are treated as post-configuration ops (e.g. PHY-tuned)
+ * and are allowed to run at the full post-config rate. All other ops are
+ * capped to @mem->spi->max_speed_hz, the always-reachable base rate.
  */
 void spi_mem_adjust_op_freq(struct spi_mem *mem, struct spi_mem_op *op)
 {
+	if (mem->spi->post_config_max_speed_hz &&
+	    op->max_freq == mem->spi->post_config_max_speed_hz)
+		return;
+
 	if (!op->max_freq || op->max_freq > mem->spi->max_speed_hz)
 		op->max_freq = mem->spi->max_speed_hz;
 }
-- 
2.34.1