From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Subject: [PATCH] bcma: get SoC device struct & copy its DMA params to the subdevices MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit For bus devices to be fully usable it's required to set their DMA parameters. For years it has been missing and remained unnoticed because of mips_dma_alloc_coherent() silently handling the empty coherent_dma_mask. Kernel 4.19 came with a lot of DMA changes and caused a regression on the bcm47xx. Starting with the commit f8c55dc6e828 ("MIPS: use generic dma noncoherent ops for simple noncoherent platforms") DMA coherent allocations just fail. Example: [ 1.114914] bgmac_bcma bcma0:2: Allocation of TX ring 0x200 failed [ 1.121215] bgmac_bcma bcma0:2: Unable to alloc memory for DMA [ 1.127626] bgmac_bcma: probe of bcma0:2 failed with error -12 [ 1.133838] bgmac_bcma: Broadcom 47xx GBit MAC driver loaded This change fixes above regression in addition to the MIPS bcm47xx commit 321c46b91550 ("MIPS: BCM47XX: Setup struct device for the SoC"). It also fixes another *old* GPIO regression caused by a parent pointing to the NULL: [ 0.157054] missing gpiochip .dev parent pointer [ 0.157287] bcma: bus0: Error registering GPIO driver: -22 introduced by the commit 74f4e0cc6108 ("bcma: switch GPIO portions to use GPIOLIB_IRQCHIP"). Fixes: f8c55dc6e828 ("MIPS: use generic dma noncoherent ops for simple noncoherent platforms") Fixes: 74f4e0cc6108 ("bcma: switch GPIO portions to use GPIOLIB_IRQCHIP") Cc: linux-mips@linux-mips.org Cc: Christoph Hellwig Cc: Linus Walleij Signed-off-by: Rafał Miłecki --- --- a/drivers/bcma/host_soc.c +++ b/drivers/bcma/host_soc.c @@ -191,6 +191,8 @@ int __init bcma_host_soc_init(struct bcm struct bcma_bus *bus = &soc->bus; int err; + bus->dev = soc->dev; + /* Scan bus and initialize it */ err = bcma_bus_early_register(bus); if (err) --- a/drivers/bcma/main.c +++ b/drivers/bcma/main.c @@ -236,13 +236,17 @@ EXPORT_SYMBOL(bcma_core_irq); void bcma_prepare_core(struct bcma_bus *bus, struct bcma_device *core) { - device_initialize(&core->dev); + struct device *dev = &core->dev; + + device_initialize(dev); core->dev.release = bcma_release_core_dev; core->dev.bus = &bcma_bus_type; - dev_set_name(&core->dev, "bcma%d:%d", bus->num, core->core_index); + dev_set_name(dev, "bcma%d:%d", bus->num, core->core_index); core->dev.parent = bus->dev; - if (bus->dev) + if (bus->dev) { bcma_of_fill_device(bus->dev, core); + dma_coerce_mask_and_coherent(dev, bus->dev->coherent_dma_mask); + } switch (bus->hosttype) { case BCMA_HOSTTYPE_PCI: