I demand that Pierre Ossman may or may not have written...
> Hi Darren,
> It has come to my attention that the current routine for setting power
> is not compliant with the specification. As such, I'd like you to try
> the following and see if removes the need for your patch:
Your patch was mangled by Thunderbird. IME, it always does this; you should
attach patches, not include them inline.
Still, it was easy enough to apply the patch manually.
> I'd appreciate if you could test this sooner rather than later as the merge
> window is just around the corner.
It doesn't work.
After applying my patch and fixing up the rejects, it still doesn't work. I
need to disable the first of the writeb() calls mentioned in the last hunk of
your patch for it to work again. I have the impression that the hardware
doesn't like the power-on bit not being set :-|
... hmm, it looks like there's a small bug in my patch: the label "out" needs
to be before the last writeb() otherwise, if power is -1, no write will
happen regardless. I'm attaching a fixed version along with an adapted
version of your patch.
Pierre, if you're happy to sign off the modified version of your patch, feel
free to convert my not-yet-signed-off-by into a normal signed-off-by.
--
| Darren Salt | linux or ds at | nr. Ashington, | Toon
| RISC OS, Linux | youmustbejoking,demon,co,uk | Northumberland | Army
| <URL:http://www.youmustbejoking.demon.co.uk/> (PGP 2.6, GPG keys)
Break up a relationship. Buy a computer.
Add a quirk to allow at least some ENE PCI SD card readers to work again
Support for these devices was broken for 2.6.18-rc1 and later by commit
146ad66eac836c0b976c98f428d73e1f6a75270d, which added voltage level support.
This restores the previous behaviour for these devices (PCI ID 1524:0550).
Signed-off-by: Darren Salt <[email protected]>
diff -ur linux-2.6.20-rc6.orig/drivers/mmc/sdhci.c linux-2.6.20-rc6/drivers/mmc/sdhci.c
--- linux-2.6.20-rc6.orig/drivers/mmc/sdhci.c 2006-12-30 15:34:11.000000000 +0000
+++ linux-2.6.20-rc6/drivers/mmc/sdhci.c 2007-02-02 20:04:54.000000000 +0000
@@ -37,6 +37,7 @@
#define SDHCI_QUIRK_FORCE_DMA (1<<1)
/* Controller doesn't like some resets when there is no card inserted. */
#define SDHCI_QUIRK_NO_CARD_NO_RESET (1<<2)
+#define SDHCI_QUIRK_SINGLE_POWER_WRITE (1<<3)
static const struct pci_device_id pci_ids[] __devinitdata = {
{
@@ -65,6 +66,16 @@
.driver_data = SDHCI_QUIRK_FORCE_DMA,
},
+ {
+ .class = PCI_CLASS_SYSTEM_SDHCI << 8,
+ .class_mask = 0xFFFF00,
+ .vendor = PCI_VENDOR_ID_ENE,
+ .device = PCI_ANY_ID,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = SDHCI_QUIRK_SINGLE_POWER_WRITE,
+ },
+
{ /* Generic SD host controller */
PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
},
@@ -669,16 +680,17 @@
static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
{
- u8 pwr;
+ u8 pwr = 0;
if (host->power == power)
return;
- writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
-
if (power == (unsigned short)-1)
goto out;
+ if ((host->chip->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE) == 0)
+ writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
+
pwr = SDHCI_POWER_ON;
switch (power) {
@@ -701,9 +713,9 @@
BUG();
}
+out:
writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
-out:
host->power = power;
}
Make the routine for setting power compliant with the specification.
Certain ENE chips seem to be sufficiently non-compliant that they don't like
this change; however, the single-power-write quirk should be enough to handle
them (and is, in the case of at least one such device).
Not-yet-signed-off-by: Darren Salt <[email protected]>
diff -ur linux-2.6.20-rc6.orig/drivers/mmc/sdhci.c linux-2.6.20-rc6/drivers/mmc/sdhci.c
--- linux-2.6.20-rc6.orig/drivers/mmc/sdhci.c 2007-02-02 20:04:54.000000000 +0000
+++ linux-2.6.20-rc6/drivers/mmc/sdhci.c 2007-02-02 20:14:28.000000000 +0000
@@ -691,28 +691,31 @@
if ((host->chip->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE) == 0)
writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
- pwr = SDHCI_POWER_ON;
-
switch (power) {
case MMC_VDD_170:
case MMC_VDD_180:
case MMC_VDD_190:
- pwr |= SDHCI_POWER_180;
+ pwr = SDHCI_POWER_180;
break;
case MMC_VDD_290:
case MMC_VDD_300:
case MMC_VDD_310:
- pwr |= SDHCI_POWER_300;
+ pwr = SDHCI_POWER_300;
break;
case MMC_VDD_320:
case MMC_VDD_330:
case MMC_VDD_340:
- pwr |= SDHCI_POWER_330;
+ pwr = SDHCI_POWER_330;
break;
default:
BUG();
}
+ if ((host->chip->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE) == 0)
+ writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
+
+ pwr |= SDHCI_POWER_ON;
+
out:
writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
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