evie/android_kernel_oneplus_msm8998
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mhi: core: Preserve DB Mode state during lpm

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When exiting low power modes (M3) do not reset
the DB Mode state if DB mode preserve flag is
set for channel.

CRs-Fixed: 1022868
Change-Id: I6557d28afe9d0ac11b76c683ffba76d7d6ffd377
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>
This commit is contained in:
Sujeev Dias 2016-05-31 19:07:48 -07:00
parent 8526dcd425
commit 4267834dd4
5 changed files with 51 additions and 29 deletions
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11
drivers/platform/msm/mhi/mhi.h
View file

@ -261,6 +261,12 @@ enum MHI_EVENT_CCS {
MHI_EVENT_CC_BAD_TRE = 0x11,
};
struct db_mode {
/* if set do not reset DB_Mode during M0 resume */
u32 preserve_db_state : 1;
u32 db_mode : 1;
};
struct mhi_ring {
void *base;
void *wp;
@ -270,6 +276,7 @@ struct mhi_ring {
uintptr_t el_size;
u32 overwrite_en;
enum MHI_CHAN_DIR dir;
struct db_mode db_mode;
};
enum MHI_CMD_STATUS {
@ -414,7 +421,6 @@ struct mhi_flags {
u32 ev_thread_stopped;
u32 st_thread_stopped;
u32 uldl_enabled;
u32 db_mode[MHI_MAX_CHANNELS];
};
struct mhi_wait_queues {
@ -577,7 +583,8 @@ int mhi_init_chan_ctxt(struct mhi_chan_ctxt *cc_list,
enum MHI_CHAN_DIR chan_type,
u32 event_ring,
struct mhi_ring *ring,
enum MHI_CHAN_STATE chan_state);
enum MHI_CHAN_STATE chan_state,
bool preserve_db_state);
int mhi_populate_event_cfg(struct mhi_device_ctxt *mhi_dev_ctxt);
int mhi_get_event_ring_for_channel(struct mhi_device_ctxt *mhi_dev_ctxt,
u32 chan);

8
drivers/platform/msm/mhi/mhi_init.c
View file

@ -592,14 +592,16 @@ error_during_props:
* @chan_type: Type of channel IN/OUT
* @event_ring: Event ring to be mapped to this channel context
* @ring: Shadow context to be initialized alongside
*
* @chan_state: Channel state
* @preserve_db_state: Do not reset DB state during resume
* @Return errno
*/
int mhi_init_chan_ctxt(struct mhi_chan_ctxt *cc_list,
uintptr_t trb_list_phy, uintptr_t trb_list_virt,
u64 el_per_ring, enum MHI_CHAN_DIR chan_type,
u32 event_ring, struct mhi_ring *ring,
enum MHI_CHAN_STATE chan_state)
enum MHI_CHAN_STATE chan_state,
bool preserve_db_state)
{
cc_list->mhi_chan_state = chan_state;
cc_list->mhi_chan_type = chan_type;
@ -617,6 +619,8 @@ int mhi_init_chan_ctxt(struct mhi_chan_ctxt *cc_list,
ring->el_size = sizeof(struct mhi_tx_pkt);
ring->overwrite_en = 0;
ring->dir = chan_type;
ring->db_mode.db_mode = 1;
ring->db_mode.preserve_db_state = (preserve_db_state) ? 1 : 0;
/* Flush writes to MMIO */
wmb();
return 0;

4
drivers/platform/msm/mhi/mhi_macros.h
View file

@ -244,6 +244,10 @@
#define MHI_CHAN_TYPE__MASK (3)
#define MHI_CHAN_TYPE__SHIFT (6)
#define PRESERVE_DB_STATE
#define MHI_PRESERVE_DB_STATE__MASK (1)
#define MHI_PRESERVE_DB_STATE__SHIFT (8)
#define GET_CHAN_PROPS(_FIELD, _VAL) \
(((_VAL) >> MHI_##_FIELD ## __SHIFT) & MHI_##_FIELD ## __MASK)

21
drivers/platform/msm/mhi/mhi_main.c
View file

@ -212,7 +212,7 @@ int mhi_release_chan_ctxt(struct mhi_device_ctxt *mhi_dev_ctxt,
ring->len, ring->base,
cc_list->mhi_trb_ring_base_addr);
mhi_init_chan_ctxt(cc_list, 0, 0, 0, 0, 0, ring,
MHI_CHAN_STATE_DISABLED);
MHI_CHAN_STATE_DISABLED, false);
return 0;
}
@ -259,7 +259,9 @@ static int populate_tre_ring(struct mhi_client_handle *client_handle)
client_handle->chan_info.flags),
client_handle->chan_info.ev_ring,
&mhi_dev_ctxt->mhi_local_chan_ctxt[chan],
MHI_CHAN_STATE_ENABLED);
MHI_CHAN_STATE_ENABLED,
GET_CHAN_PROPS(PRESERVE_DB_STATE,
client_handle->chan_info.flags));
mhi_log(MHI_MSG_INFO, "Exited\n");
return 0;
}
@ -654,6 +656,7 @@ static int mhi_queue_dma_xfer(
MHI_ASSERT(VALID_BUF(buf, buf_len, mhi_dev_ctxt),
"Client buffer is of invalid length\n");
chan = client_handle->chan_info.chan_nr;
mhi_log(MHI_MSG_INFO, "Getting Reference %d", chan);
pm_runtime_get(&mhi_dev_ctxt->dev_info->pcie_device->dev);
@ -698,6 +701,7 @@ static int mhi_queue_dma_xfer(
error:
pm_runtime_mark_last_busy(&mhi_dev_ctxt->dev_info->pcie_device->dev);
mhi_log(MHI_MSG_INFO, "Putting Reference %d", chan);
pm_runtime_put_noidle(&mhi_dev_ctxt->dev_info->pcie_device->dev);
return ret_val;
@ -1169,12 +1173,13 @@ int parse_xfer_event(struct mhi_device_ctxt *ctxt,
mhi_dev_ctxt->flags.uldl_enabled = 1;
chan = MHI_EV_READ_CHID(EV_CHID, event);
mhi_dev_ctxt->flags.db_mode[chan] = 1;
chan_ctxt =
&mhi_dev_ctxt->mhi_local_chan_ctxt[chan];
mhi_log(MHI_MSG_INFO, "DB_MODE/OOB Detected chan %d.\n", chan);
spin_lock_irqsave(&mhi_dev_ctxt->db_write_lock[chan],
flags);
chan_ctxt->db_mode.db_mode = 1;
if (chan_ctxt->wp != chan_ctxt->rp) {
db_value = mhi_v2p_addr(mhi_dev_ctxt,
MHI_RING_TYPE_XFER_RING, chan,
@ -1658,6 +1663,8 @@ void mhi_process_db(struct mhi_device_ctxt *mhi_dev_ctxt,
void __iomem *io_addr,
uintptr_t chan, u32 val)
{
struct mhi_ring *chan_ctxt = &mhi_dev_ctxt->mhi_local_chan_ctxt[chan];
mhi_log(MHI_MSG_VERBOSE,
"db.set addr: %p io_offset 0x%lx val:0x%x\n",
io_addr, chan, val);
@ -1668,14 +1675,14 @@ void mhi_process_db(struct mhi_device_ctxt *mhi_dev_ctxt,
if (io_addr == mhi_dev_ctxt->mmio_info.chan_db_addr) {
if (!(IS_HARDWARE_CHANNEL(chan) &&
mhi_dev_ctxt->flags.uldl_enabled &&
!mhi_dev_ctxt->flags.db_mode[chan])) {
!chan_ctxt->db_mode.db_mode)) {
mhi_write_db(mhi_dev_ctxt, io_addr, chan, val);
mhi_dev_ctxt->flags.db_mode[chan] = 0;
chan_ctxt->db_mode.db_mode = 0;
} else {
mhi_log(MHI_MSG_INFO,
"Not ringing xfer db, chan %ld, ul_dl %d db_mode %d\n",
chan, mhi_dev_ctxt->flags.uldl_enabled,
mhi_dev_ctxt->flags.db_mode[chan]);
chan_ctxt->db_mode.db_mode);
}
/* Event Doorbell and Polling mode Disabled */
} else if (io_addr == mhi_dev_ctxt->mmio_info.event_db_addr) {
@ -1683,11 +1690,9 @@ void mhi_process_db(struct mhi_device_ctxt *mhi_dev_ctxt,
if (IS_SW_EV_RING(mhi_dev_ctxt, chan) ||
!mhi_dev_ctxt->flags.uldl_enabled) {
mhi_write_db(mhi_dev_ctxt, io_addr, chan, val);
mhi_dev_ctxt->flags.db_mode[chan] = 0;
}
} else {
mhi_write_db(mhi_dev_ctxt, io_addr, chan, val);
mhi_dev_ctxt->flags.db_mode[chan] = 0;
}
}

12
drivers/platform/msm/mhi/mhi_states.c
View file

@ -90,11 +90,13 @@ static void ring_all_chan_dbs(struct mhi_device_ctxt *mhi_dev_ctxt,
for (i = 0; i < MHI_MAX_CHANNELS; ++i)
if (VALID_CHAN_NR(i)) {
local_ctxt = &mhi_dev_ctxt->mhi_local_chan_ctxt[i];
if (IS_HARDWARE_CHANNEL(i) && reset_db_mode)
mhi_dev_ctxt->flags.db_mode[i] = 1;
if ((local_ctxt->wp != local_ctxt->rp) ||
((local_ctxt->wp != local_ctxt->rp) &&
(local_ctxt->dir == MHI_IN)))
/* Reset the DB Mode state to DB Mode */
if (local_ctxt->db_mode.preserve_db_state == 0
&& reset_db_mode)
local_ctxt->db_mode.db_mode = 1;
if (local_ctxt->wp != local_ctxt->rp)
conditional_chan_db_write(mhi_dev_ctxt, i);
}
}