mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency (15bed0f2) · Commits · 戴 / test

Ricoh 1180:e823 does not recognize certain types of SD/MMC cards, as reported at http://launchpad.net/bugs/773524 . Lowering the SD base clock frequency from 200Mhz to 50Mhz fixes this issue. This solution was suggest by Koji Matsumuro, Ricoh Company, Ltd. This change has no negative performance effect on standard SD cards, though it's quite possible that there will be one on UHS-1 cards. Signed-off-by:

Manoj Iyer <manoj.iyer@canonical.com> Tested-by:

Daniel Manrique <daniel.manrique@canonical.com> Cc: Koji Matsumuro <matsumur@nts.ricoh.co.jp> Cc: <stable@kernel.org> Acked-by:

Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by:

Chris Ball <cjb@laptop.org>

drivers/pci/quirks.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -2758,6 +2758,29 @@ static void ricoh_mmc_fixup_r5c832(struct pci_dev *dev)

		dev_notice(&dev->dev, "proprietary Ricoh MMC controller disabled (via firewire function)\n");
		dev_notice(&dev->dev, "MMC cards are now supported by standard SDHCI controller\n");

		/*
		* RICOH 0xe823 SD/MMC card reader fails to recognize
		* certain types of SD/MMC cards. Lowering the SD base
		* clock frequency from 200Mhz to 50Mhz fixes this issue.
		*
		* 0x150 - SD2.0 mode enable for changing base clock
		* frequency to 50Mhz
		* 0xe1 - Base clock frequency
		* 0x32 - 50Mhz new clock frequency
		* 0xf9 - Key register for 0x150
		* 0xfc - key register for 0xe1
		*/
		if (dev->device == PCI_DEVICE_ID_RICOH_R5CE823) {
		pci_write_config_byte(dev, 0xf9, 0xfc);
		pci_write_config_byte(dev, 0x150, 0x10);
		pci_write_config_byte(dev, 0xf9, 0x00);
		pci_write_config_byte(dev, 0xfc, 0x01);
		pci_write_config_byte(dev, 0xe1, 0x32);
		pci_write_config_byte(dev, 0xfc, 0x00);

		dev_notice(&dev->dev, "MMC controller base frequency changed to 50Mhz.\n");
		}
		}
		DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_R5C832, ricoh_mmc_fixup_r5c832);
		DECLARE_PCI_FIXUP_RESUME_EARLY(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_R5C832, ricoh_mmc_fixup_r5c832);

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