From c064bb5c78c1b1e11a359993e5022795c65c5475 Mon Sep 17 00:00:00 2001 From: Hector Martin Date: Thu, 16 Dec 2021 01:10:45 +0900 Subject: mmc: sdhci-pci-gli: GL975[50]: Issue 8/16-bit MMIO reads as 32-bit reads. For some reason, <32-bit reads do not work on Apple ARM64 platforms with these chips (even though they do on other PCIe devices). Issue them as 32-bit reads instead. This is done unconditionally, as it shouldn't hurt even if not necessary. Acked-by: Adrian Hunter Signed-off-by: Hector Martin Link: https://lore.kernel.org/r/20211215161045.38843-3-marcan@marcan.st Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci-pci-gli.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c index ad50f16658fe..97035d77c18c 100644 --- a/drivers/mmc/host/sdhci-pci-gli.c +++ b/drivers/mmc/host/sdhci-pci-gli.c @@ -902,7 +902,28 @@ static int gli_probe_slot_gl9763e(struct sdhci_pci_slot *slot) return 0; } +#define REG_OFFSET_IN_BITS(reg) ((reg) << 3 & 0x18) + +static u16 sdhci_gli_readw(struct sdhci_host *host, int reg) +{ + u32 val = readl(host->ioaddr + (reg & ~3)); + u16 word; + + word = (val >> REG_OFFSET_IN_BITS(reg)) & 0xffff; + return word; +} + +static u8 sdhci_gli_readb(struct sdhci_host *host, int reg) +{ + u32 val = readl(host->ioaddr + (reg & ~3)); + u8 byte = (val >> REG_OFFSET_IN_BITS(reg)) & 0xff; + + return byte; +} + static const struct sdhci_ops sdhci_gl9755_ops = { + .read_w = sdhci_gli_readw, + .read_b = sdhci_gli_readb, .set_clock = sdhci_gl9755_set_clock, .enable_dma = sdhci_pci_enable_dma, .set_bus_width = sdhci_set_bus_width, @@ -922,6 +943,8 @@ const struct sdhci_pci_fixes sdhci_gl9755 = { }; static const struct sdhci_ops sdhci_gl9750_ops = { + .read_w = sdhci_gli_readw, + .read_b = sdhci_gli_readb, .read_l = sdhci_gl9750_readl, .set_clock = sdhci_gl9750_set_clock, .enable_dma = sdhci_pci_enable_dma, -- cgit