I have a RHEL 6 system with kernel 2.6.32 that is currently exhibiting problems with the sdhci driver.
When I first load the sdhci_pci kernel module (after loading the sdhci module) when an SD card is inserted, I observe a large number of I/O errors and the device is not enumerated.
Oct 13 02:52:57 localhost kernel: sdhci: Secure Digital Host Controller Interface driver
Oct 13 02:52:57 localhost kernel: sdhci: Copyright(c) Pierre Ossman
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1b.0: SDHCI controller found [8086:5aca] (rev b)
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1b.0: power state changed by ACPI to D0
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1b.0: power state changed by ACPI to D0
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1b.0: PCI INT A -> GSI 3 (level, low) -> IRQ 3
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1b.0: Invalid iomem size. You may experience problems.
Oct 13 02:52:57 localhost kernel: Registered led device: mmc0::
Oct 13 02:52:57 localhost kernel: mmc0: SDHCI controller on PCI [0000:00:1b.0] using ADMA
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1c.0: SDHCI controller found [8086:5acc] (rev b)
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1c.0: power state changed by ACPI to D0
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1c.0: power state changed by ACPI to D0
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1c.0: PCI INT A -> GSI 39 (level, low) -> IRQ 39
Oct 13 02:52:57 localhost kernel: sdhci-pci 0000:00:1c.0: Invalid iomem size. You may experience problems.
Oct 13 02:52:57 localhost kernel: Registered led device: mmc1::
Oct 13 02:52:57 localhost kernel: mmc1: SDHCI controller on PCI [0000:00:1c.0] using ADMA
Oct 13 02:52:57 localhost kernel: mmc0: new ultra high speed SDHC card at address 59b4
Oct 13 02:52:57 localhost kernel: mmcblk0: mmc0:59b4 SD 14.7 GiB
Oct 13 02:52:57 localhost kernel: mmcblk0:
Oct 13 02:52:57 localhost kernel: mmcblk0: retrying using single block read
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 sending status comand
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 sending read/write command, response 0x0, card status 0x0
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 transferring data, sector 0, nr 8, card status 0x0
Oct 13 02:52:57 localhost kernel: __ratelimit: 577 callbacks suppressed
Oct 13 02:52:57 localhost kernel: end_request: I/O error, dev mmcblk0, sector 0
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 sending status comand
Oct 13 02:52:57 localhost kernel: mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 transferring data, sector 1, nr 7, card status 0x0
Oct 13 02:52:57 localhost kernel: end_request: I/O error, dev mmcblk0, sector 1
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 sending status comand
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 sending read/write command, response 0x0, card status 0x0
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 transferring data, sector 2, nr 6, card status 0x0
Oct 13 02:52:57 localhost kernel: end_request: I/O error, dev mmcblk0, sector 2
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 sending status comand
Oct 13 02:52:57 localhost kernel: mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 transferring data, sector 3, nr 5, card status 0x0
Oct 13 02:52:57 localhost kernel: end_request: I/O error, dev mmcblk0, sector 3
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 sending status comand
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 sending read/write command, response 0x0, card status 0x0
Oct 13 02:52:57 localhost kernel: mmcblk0: error -84 transferring data, sector 4, nr 4, card status 0x0
Oct 13 02:52:57 localhost kernel: end_request: I/O error, dev mmcblk0, sector 4
...
If I subsequently unload and reload those kernel modules - with the SD card still inserted - the errors are not reported and the device is enumerated properly. I can then mount the device and read/write to it as expected.
Oct 13 02:53:31 localhost kernel: sdhci: Secure Digital Host Controller Interface driver
Oct 13 02:53:31 localhost kernel: sdhci: Copyright(c) Pierre Ossman
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1b.0: SDHCI controller found [8086:5aca] (rev b)
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1b.0: power state changed by ACPI to D0
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1b.0: power state changed by ACPI to D0
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1b.0: PCI INT A -> GSI 3 (level, low) -> IRQ 3
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1b.0: Invalid iomem size. You may experience problems.
Oct 13 02:53:50 localhost kernel: Registered led device: mmc0::
Oct 13 02:53:50 localhost kernel: mmc0: SDHCI controller on PCI [0000:00:1b.0] using ADMA
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1c.0: SDHCI controller found [8086:5acc] (rev b)
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1c.0: power state changed by ACPI to D0
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1c.0: power state changed by ACPI to D0
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1c.0: PCI INT A -> GSI 39 (level, low) -> IRQ 39
Oct 13 02:53:50 localhost kernel: sdhci-pci 0000:00:1c.0: Invalid iomem size. You may experience problems.
Oct 13 02:53:50 localhost kernel: Registered led device: mmc1::
Oct 13 02:53:50 localhost kernel: mmc1: SDHCI controller on PCI [0000:00:1c.0] using ADMA
Oct 13 02:53:50 localhost kernel: mmc0: new high speed SDHC card at address 59b4
Oct 13 02:53:50 localhost kernel: mmcblk0: mmc0:59b4 SD 14.7 GiB
Oct 13 02:53:50 localhost kernel: mmcblk0: p1
As long as I leave the SD card inserted, I can unload/reload the kernel modules and use the device with no issues.
As soon as I eject the card, however, I will once again experience errors the first time I subsequently reload sdhci and sdhci_pc and I will again see those errors go away on the very next reload.
Any insights into why this might be happening?
UPDATE:
After the I/O errors are reported, I only need to unload and reload sdhci_pci. In other words, I need not unload and reload sdhci as well.
