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spi: dw: Fix spi registration for controllers overriding CS 

When SPI DW memory ops support was introduced, there was a check for
excluding controllers which supplied their own CS function. Even so,
the mem_ops pointer is *always* presented to the SPI core.

This causes the SPI core sanity check in spi_controller_check_ops() to
refuse registration, since a mem_ops pointer is being supplied without
an exec_op member function.

The end result is failure of the SPI DW driver on sparx5 and similar
platforms.

The fix in the core SPI DW driver is to avoid presenting the mem_ops
pointer if the exec_op function is not set.

Fixes: 6423207e57 (spi: dw: Add memory operations support)
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20201120213414.339701-1-lars.povlsen@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
zero-sugar-mainline-defconfig
Lars Povlsen 2020-11-20 22:34:14 +01:00 committed by Mark Brown
parent 7cd7120296
commit 0abdb0fba0
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1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi-dw-core.c
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@ -875,7 +875,8 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
master->set_cs = dw_spi_set_cs;
master->transfer_one = dw_spi_transfer_one;
master->handle_err = dw_spi_handle_err;
master->mem_ops = &dws->mem_ops;
if (dws->mem_ops.exec_op)
master->mem_ops = &dws->mem_ops;
master->max_speed_hz = dws->max_freq;
master->dev.of_node = dev->of_node;
master->dev.fwnode = dev->fwnode;