sw: spi: Add check for Divider value

Adding condition to warn about 0 divider value. It was observed while accessing svec-flash, if frequency for flash is not defined correctly i.e in operation range of chip and host(i.e vme or pci), divider value 0 doesn't allow flash transfers. Signed-off-by Mamta Shukla <mamta.ramendra.shukla@cern.ch> Suggested-by: Federico Vaga <federico.vaga@cern.ch>

sw: spi: Add check for Divider value
Adding condition to warn about 0 divider value. It was observed while accessing svec-flash, if frequency for flash is not defined correctly i.e in operation range of chip and host(i.e vme or pci), divider value 0 doesn't allow flash transfers. Signed-off-by Mamta Shukla <mamta.ramendra.shukla@cern.ch> Suggested-by: Federico Vaga <federico.vaga@cern.ch>
e57a80e9 · Mamta Shukla · 347e0de1 · e57a80e9
Commit e57a80e9 authored Oct 22, 2020 by Mamta Shukla
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spi-ocores.c software/spi-ocores/drivers/spi/spi-ocores.c +6 -0

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--- a/software/spi-ocores/drivers/spi/spi-ocores.c
+++ b/software/spi-ocores/drivers/spi/spi-ocores.c
@@ -481,6 +481,12 @@ static int spi_ocores_sw_xfer_next_init(struct spi_ocores *sp)
 	else
 		hz = sp->master->cur_msg->spi->max_speed_hz;
 	divider = (sp->clock_hz / (hz * 2)) - 1;
+
+	if (WARN_ON(divider == 0)) {
+		dev_warn(&sp->master->dev, "divider value is 0\n");
+		divider =1;
+	}
+
 	spi_ocores_hw_xfer_config(sp, ctrl, divider);