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net: stmmac: stmmac_platform: fix parsing of DT binding
commit64c3b252e9
("net: stmmac: fixed the pbl setting with DT") changed the parsing of the DT binding. Before64c3b252e9
, snps,fixed-burst and snps,mixed-burst were parsed regardless if the property snps,pbl existed or not. After the commit, fixed burst and mixed burst are only parsed if snps,pbl exists. Now when snps,aal has been added, it too is only parsed if snps,pbl exists. Since the DT binding does not specify that fixed burst, mixed burst or aal depend on snps,pbl being specified, undo changes introduced by64c3b252e9
. The issue commit64c3b252e9
("net: stmmac: fixed the pbl setting with DT") tries to address is solved in another way: The databook specifies that all values other than 1, 2, 4, 8, 16, or 32 results in undefined behavior, so snps,pbl = <0> is invalid. If pbl is 0 after parsing, set pbl to DEFAULT_DMA_PBL. This handles the case where the property is omitted, and also handles the case where the property is specified without any data. Signed-off-by: Niklas Cassel <niklas.cassel@axis.com> Acked-by: Alexandre Torgue <alexandre.torgue@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
50ca903afc
commit
a332e2fa56
@ -1581,8 +1581,8 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
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int atds = 0;
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int ret = 0;
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if (!priv->plat->dma_cfg) {
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dev_err(priv->device, "DMA configuration not found\n");
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if (!priv->plat->dma_cfg || !priv->plat->dma_cfg->pbl) {
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dev_err(priv->device, "Invalid DMA configuration\n");
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return -EINVAL;
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}
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@ -304,21 +304,22 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
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plat->force_sf_dma_mode = 1;
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}
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if (of_find_property(np, "snps,pbl", NULL)) {
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dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
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GFP_KERNEL);
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if (!dma_cfg) {
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stmmac_remove_config_dt(pdev, plat);
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return ERR_PTR(-ENOMEM);
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}
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plat->dma_cfg = dma_cfg;
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of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
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dma_cfg->aal = of_property_read_bool(np, "snps,aal");
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dma_cfg->fixed_burst =
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of_property_read_bool(np, "snps,fixed-burst");
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dma_cfg->mixed_burst =
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of_property_read_bool(np, "snps,mixed-burst");
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dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
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GFP_KERNEL);
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if (!dma_cfg) {
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stmmac_remove_config_dt(pdev, plat);
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return ERR_PTR(-ENOMEM);
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}
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plat->dma_cfg = dma_cfg;
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of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
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if (!dma_cfg->pbl)
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dma_cfg->pbl = DEFAULT_DMA_PBL;
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dma_cfg->aal = of_property_read_bool(np, "snps,aal");
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dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
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dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");
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plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
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if (plat->force_thresh_dma_mode) {
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plat->force_sf_dma_mode = 0;
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