diff options
| -rw-r--r-- | drivers/net/ipa/gsi.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c index 58bec70db5ab..7c2e82062559 100644 --- a/drivers/net/ipa/gsi.c +++ b/drivers/net/ipa/gsi.c @@ -1087,10 +1087,32 @@ static void gsi_isr_gp_int1(struct gsi *gsi) u32 result; u32 val; + /* This interrupt is used to handle completions of the two GENERIC + * GSI commands. We use these to allocate and halt channels on + * the modem's behalf due to a hardware quirk on IPA v4.2. Once + * allocated, the modem "owns" these channels, and as a result we + * have no way of knowing the channel's state at any given time. + * + * It is recommended that we halt the modem channels we allocated + * when shutting down, but it's possible the channel isn't running + * at the time we issue the HALT command. We'll get an error in + * that case, but it's harmless (the channel is already halted). + * + * For this reason, we silently ignore a CHANNEL_NOT_RUNNING error + * if we receive it. + */ val = ioread32(gsi->virt + GSI_CNTXT_SCRATCH_0_OFFSET); result = u32_get_bits(val, GENERIC_EE_RESULT_FMASK); - if (result != GENERIC_EE_SUCCESS) + + switch (result) { + case GENERIC_EE_SUCCESS: + case GENERIC_EE_CHANNEL_NOT_RUNNING: + break; + + default: dev_err(gsi->dev, "global INT1 generic result %u\n", result); + break; + } complete(&gsi->completion); } |