From 03691bf3038250def574c78576a8be39133923fd Mon Sep 17 00:00:00 2001 From: Robin Gong Date: Tue, 6 Jun 2017 16:56:49 +0800 Subject: [PATCH] MLK-15014 dma: fsl-edma-v3: clear DONE before E_SG enabled Below described in RM, otherwise, channel error status(CHa_ES) may be triggered: The user must clear the CHa_CSR[DONE] bit before writing the TCDa_CSR[MAJORELINK] or TCDa_CSR[ESG] bits. Signed-off-by: Robin Gong (cherry picked from commit c4164d0a15306174056c6ff423ba2408dd901fcf) --- drivers/dma/fsl-edma-v3.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/dma/fsl-edma-v3.c +++ b/drivers/dma/fsl-edma-v3.c @@ -421,6 +421,11 @@ static void fsl_edma3_set_tcd_regs(struc writel(le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA); + /* Must clear CHa_CSR[DONE] bit before enable TCDa_CSR[ESG] */ + if ((EDMA_TCD_CSR_E_SG | le16_to_cpu(tcd->csr)) && + EDMA_CH_CSR_DONE | readl(addr + EDMA_CH_CSR)) + writel(EDMA_CH_CSR_DONE, addr + EDMA_CH_CSR); + writew(le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR); }