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net: ipa: zero return code before issuing generic EE command 

Zero the result code stored in a field of the scratch 0 register
before issuing a generic EE command.  This just guarantees that
the value we read later was actually written as a result of the
command.

Also add the definitions of two more possible result codes that can
be returned when issuing flow control enable or disable commands:
  INCORRECT_CHANNEL_STATE: - channel must be in started state
  INCORRECT_DIRECTION - flow control is only valid for TX channels

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder 2020-04-30 16:35:12 -05:00 committed by David S. Miller
parent 0721999f15
commit 0b1ba18aec
2 changed files with 9 additions and 0 deletions
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7
drivers/net/ipa/gsi.c
View File

@ -1041,6 +1041,7 @@ static void gsi_isr_gp_int1(struct gsi *gsi)
complete(&gsi->completion);
}
/* Inter-EE interrupt handler */
static void gsi_isr_glob_ee(struct gsi *gsi)
{
@ -1493,6 +1494,12 @@ static int gsi_generic_command(struct gsi *gsi, u32 channel_id,
struct completion *completion = &gsi->completion;
u32 val;
/* First zero the result code field */
val = ioread32(gsi->virt + GSI_CNTXT_SCRATCH_0_OFFSET);
val &= ~GENERIC_EE_RESULT_FMASK;
iowrite32(val, gsi->virt + GSI_CNTXT_SCRATCH_0_OFFSET);
/* Now issue the command */
val = u32_encode_bits(opcode, GENERIC_OPCODE_FMASK);
val |= u32_encode_bits(channel_id, GENERIC_CHID_FMASK);
val |= u32_encode_bits(GSI_EE_MODEM, GENERIC_EE_FMASK);

2
drivers/net/ipa/gsi_reg.h
View File

@ -410,6 +410,8 @@
#define INTER_EE_RESULT_FMASK GENMASK(2, 0)
#define GENERIC_EE_RESULT_FMASK GENMASK(7, 5)
#define GENERIC_EE_SUCCESS_FVAL 1
#define GENERIC_EE_INCORRECT_DIRECTION_FVAL 3
#define GENERIC_EE_INCORRECT_CHANNEL_FVAL 5
#define GENERIC_EE_NO_RESOURCES_FVAL 7
#define USB_MAX_PACKET_FMASK GENMASK(15, 15) /* 0: HS; 1: SS */
#define MHI_BASE_CHANNEL_FMASK GENMASK(31, 24)