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serial: imx: only set receiver level if it is zero
commit 9706fc8 upstream. With commit a81dbd0 ("serial: imx: set receiver level before starting uart") we set the receiver level to its default value. This caused a regression when using SDMA, where the receiver level is 9 instead of 8 (default). This change will first check if the receiver level is zero and only then set it to the default. This still avoids the interrupt storm when the receiver level is zero. Fixes: a81dbd0 ("serial: imx: set receiver level before starting uart") Cc: stable <stable@kernel.org> Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com> Link: https://lore.kernel.org/r/20240703112543.148304-1-eichest@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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