From 6b3374cb1c0bd4699ace03d7e0dc14b532e4f52e Mon Sep 17 00:00:00 2001 From: Niklas Cassel <niklas.cassel@axis.com> Date: Mon, 5 Dec 2016 18:12:54 +0100 Subject: [PATCH] net: stmmac: clear reset value of snps, wr_osr_lmt/snps, rd_osr_lmt before writing WR_OSR_LMT and RD_OSR_LMT have a reset value of 1. Since the reset value wasn't cleared before writing, the value in the register would be incorrect if specifying an uneven value for snps,wr_osr_lmt/snps,rd_osr_lmt. Zero is a valid value for the properties, since the databook specifies: maximum outstanding requests = WR_OSR_LMT + 1. We do not want to change the behavior for existing users when the property is missing. Therefore, default to 1 if the property is missing, since that is the same as the reset value. Signed-off-by: Niklas Cassel <niklas.cassel@axis.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 2 ++ drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 2 ++ drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 6 ++++-- 3 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c index 99074695521690..f35385266fbf04 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c @@ -43,9 +43,11 @@ static void dwmac1000_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi) if (axi->axi_xit_frm) value |= DMA_AXI_LPI_XIT_FRM; + value &= ~DMA_AXI_WR_OSR_LMT; value |= (axi->axi_wr_osr_lmt & DMA_AXI_WR_OSR_LMT_MASK) << DMA_AXI_WR_OSR_LMT_SHIFT; + value &= ~DMA_AXI_RD_OSR_LMT; value |= (axi->axi_rd_osr_lmt & DMA_AXI_RD_OSR_LMT_MASK) << DMA_AXI_RD_OSR_LMT_SHIFT; diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c index 116151cd6a9523..32bc2fc73cdc2b 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c @@ -30,9 +30,11 @@ static void dwmac4_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi) if (axi->axi_xit_frm) value |= DMA_AXI_LPI_XIT_FRM; + value &= ~DMA_AXI_WR_OSR_LMT; value |= (axi->axi_wr_osr_lmt & DMA_AXI_OSR_MAX) << DMA_AXI_WR_OSR_LMT_SHIFT; + value &= ~DMA_AXI_RD_OSR_LMT; value |= (axi->axi_rd_osr_lmt & DMA_AXI_OSR_MAX) << DMA_AXI_RD_OSR_LMT_SHIFT; diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c index a840818bf4df6a..ac3d39c69509a7 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c @@ -126,8 +126,10 @@ static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev) axi->axi_mb = of_property_read_bool(np, "snps,axi_mb"); axi->axi_rb = of_property_read_bool(np, "snps,axi_rb"); - of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt); - of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt); + if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt)) + axi->axi_wr_osr_lmt = 1; + if (of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt)) + axi->axi_rd_osr_lmt = 1; of_property_read_u32_array(np, "snps,blen", axi->axi_blen, AXI_BLEN); of_node_put(np); -- GitLab