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mmc: mmci: Reverse IRQ handling for the arm_variant

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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>
This commit is contained in:
Ulf Hansson 2014-06-13 13:21:38 +02:00
parent ad82bfea44
commit 7878289b26
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/mmc/host/mmci.c
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@ -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)