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| author | Ulf Hansson <ulf.hansson@linaro.org> | 2014-06-13 13:21:38 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2014-08-11 10:24:23 +0200 |
| commit | 7878289b269d41c8e611aa6d4519feae706e49f3 (patch) | |
| tree | fa9ea335a8123968a123551d7cb92fc1d5bf651a /drivers/mmc/host | |
| parent | ad82bfea44835da9633548e2031a1af4a9965c14 (diff) | |
| download | blackbird-op-linux-7878289b269d41c8e611aa6d4519feae706e49f3.tar.gz blackbird-op-linux-7878289b269d41c8e611aa6d4519feae706e49f3.zip | |
mmc: mmci: Reverse IRQ handling for the arm_variant
Commit "mmc: mmci: Handle CMD irq before DATA irq", caused an issue
when using the ARM model of the PL181 and running QEMU.
The bug was reported for the following QEMU version:
$ qemu-system-arm -version
QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.1), Copyright
(c) 2003-2008 Fabrice Bellard
To resolve the problem, let's restore the old behavior were the DATA
irq is handled prior the CMD irq, but only for the arm_variant, which
the problem was reported for.
Reported-by: John Stultz <john.stultz@linaro.org>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Russell King <linux@arm.linux.org.uk>
Tested-by: Kees Cook <keescook@chromium.org>
Tested-by: John Stultz <john.stultz@linaro.org>
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/mmci.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 5d20bfba3e49..e4d470704150 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -74,6 +74,7 @@ static unsigned int fmax = 515633; * @pwrreg_nopower: bits in MMCIPOWER don't controls ext. power supply * @explicit_mclk_control: enable explicit mclk control in driver. * @qcom_fifo: enables qcom specific fifo pio read logic. + * @reversed_irq_handling: handle data irq before cmd irq. */ struct variant_data { unsigned int clkreg; @@ -97,6 +98,7 @@ struct variant_data { bool pwrreg_nopower; bool explicit_mclk_control; bool qcom_fifo; + bool reversed_irq_handling; }; static struct variant_data variant_arm = { @@ -105,6 +107,7 @@ static struct variant_data variant_arm = { .datalength_bits = 16, .pwrreg_powerup = MCI_PWR_UP, .f_max = 100000000, + .reversed_irq_handling = true, }; static struct variant_data variant_arm_extended_fifo = { @@ -1236,8 +1239,13 @@ static irqreturn_t mmci_irq(int irq, void *dev_id) dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status); - mmci_cmd_irq(host, host->cmd, status); - mmci_data_irq(host, host->data, status); + if (host->variant->reversed_irq_handling) { + mmci_data_irq(host, host->data, status); + mmci_cmd_irq(host, host->cmd, status); + } else { + mmci_cmd_irq(host, host->cmd, status); + mmci_data_irq(host, host->data, status); + } /* Don't poll for busy completion in irq context. */ if (host->busy_status) |
