sw: add NO_SWAP data for DATA endianess correction

In some SVEC+ADC designs data is swapped in HW, so there is no need to swap them again in software Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

sw: add NO_SWAP data for DATA endianess correction
In some SVEC+ADC designs data is swapped in HW, so there is no need to swap them again in software Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
ea4ad850 · Federico Vaga · 278dd55e · ea4ad850 · ea4ad850
Commit ea4ad850 authored Jul 06, 2021 by Federico Vaga
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Showing with 5 additions and 4 deletions

fa-dma.c software/kernel/fa-dma.c +3 -4

fmc-adc-100m14b4cha.h software/kernel/platform_data/fmc-adc-100m14b4cha.h +2 -0

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--- a/software/kernel/fa-dma.c
+++ b/software/kernel/fa-dma.c
@@ -322,11 +322,10 @@ static void zfad_dma_context_exit_svec(struct zio_cset *cset,
 {
 	struct fa_dev *fa = cset->zdev->priv_d;

-	if (fa_is_flag_set(fa, FMC_ADC_BIG_ENDIAN))
-		__endianness(zfad_block->block->datalen,
-					 zfad_block->block->data);
-
 	kfree(zfad_block->dma_ctx);
+	if (fa_is_flag_set(fa, FMC_ADC_DATA_NO_SWAP))
+		return;
+	__endianness(zfad_block->block->datalen, zfad_block->block->data);
 }

 static void zfad_dma_context_exit(struct zio_cset *cset,

--- a/software/kernel/platform_data/fmc-adc-100m14b4cha.h
+++ b/software/kernel/platform_data/fmc-adc-100m14b4cha.h
@@ -9,6 +9,8 @@

 #define FMC_ADC_BIG_ENDIAN BIT(0)
 #define FMC_ADC_NOSQUASH_SCATTERLIST BIT(1)
+#define FMC_ADC_DATA_NO_SWAP BIT(2)
+
 /*
 * In principle this should not be necessary. The two variants should
 * be as close as possible to each other. But this is not the case, the DMA