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Date: Wed, 18 Aug 2021 16:50:34 -0700
From: Bhaumik Bhatt <bbhatt@...eaurora.org>
To: manivannan.sadhasivam@...aro.org
Cc: linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
linux-kernel@...r.kernel.org, loic.poulain@...aro.org,
quic_jhugo@...cinc.com, Bhaumik Bhatt <bbhatt@...eaurora.org>
Subject: [PATCH v1 2/2] bus: mhi: core: Optimize and update MMIO register write method
As of now, MMIO writes done after ready state transition use the
mhi_write_reg_field() API even though the whole register is being
written in most cases. Optimize this process by using mhi_write_reg()
API instead for those writes and use the mhi_write_reg_field()
API for MHI config registers only.
Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
---
drivers/bus/mhi/core/init.c | 64 ++++++++++++++++++++++-----------------------
1 file changed, 31 insertions(+), 33 deletions(-)
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 0917465..e4be171 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -433,75 +433,65 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl)
struct device *dev = &mhi_cntrl->mhi_dev->dev;
struct {
u32 offset;
- u32 mask;
- u32 shift;
u32 val;
} reg_info[] = {
{
- CCABAP_HIGHER, U32_MAX, 0,
+ CCABAP_HIGHER,
upper_32_bits(mhi_cntrl->mhi_ctxt->chan_ctxt_addr),
},
{
- CCABAP_LOWER, U32_MAX, 0,
+ CCABAP_LOWER,
lower_32_bits(mhi_cntrl->mhi_ctxt->chan_ctxt_addr),
},
{
- ECABAP_HIGHER, U32_MAX, 0,
+ ECABAP_HIGHER,
upper_32_bits(mhi_cntrl->mhi_ctxt->er_ctxt_addr),
},
{
- ECABAP_LOWER, U32_MAX, 0,
+ ECABAP_LOWER,
lower_32_bits(mhi_cntrl->mhi_ctxt->er_ctxt_addr),
},
{
- CRCBAP_HIGHER, U32_MAX, 0,
+ CRCBAP_HIGHER,
upper_32_bits(mhi_cntrl->mhi_ctxt->cmd_ctxt_addr),
},
{
- CRCBAP_LOWER, U32_MAX, 0,
+ CRCBAP_LOWER,
lower_32_bits(mhi_cntrl->mhi_ctxt->cmd_ctxt_addr),
},
{
- MHICFG, MHICFG_NER_MASK, MHICFG_NER_SHIFT,
- mhi_cntrl->total_ev_rings,
- },
- {
- MHICFG, MHICFG_NHWER_MASK, MHICFG_NHWER_SHIFT,
- mhi_cntrl->hw_ev_rings,
- },
- {
- MHICTRLBASE_HIGHER, U32_MAX, 0,
+ MHICTRLBASE_HIGHER,
upper_32_bits(mhi_cntrl->iova_start),
},
{
- MHICTRLBASE_LOWER, U32_MAX, 0,
+ MHICTRLBASE_LOWER,
lower_32_bits(mhi_cntrl->iova_start),
},
{
- MHIDATABASE_HIGHER, U32_MAX, 0,
+ MHIDATABASE_HIGHER,
upper_32_bits(mhi_cntrl->iova_start),
},
{
- MHIDATABASE_LOWER, U32_MAX, 0,
+ MHIDATABASE_LOWER,
lower_32_bits(mhi_cntrl->iova_start),
},
{
- MHICTRLLIMIT_HIGHER, U32_MAX, 0,
+ MHICTRLLIMIT_HIGHER,
upper_32_bits(mhi_cntrl->iova_stop),
},
{
- MHICTRLLIMIT_LOWER, U32_MAX, 0,
+ MHICTRLLIMIT_LOWER,
lower_32_bits(mhi_cntrl->iova_stop),
},
{
- MHIDATALIMIT_HIGHER, U32_MAX, 0,
+ MHIDATALIMIT_HIGHER,
upper_32_bits(mhi_cntrl->iova_stop),
},
{
- MHIDATALIMIT_LOWER, U32_MAX, 0,
+ MHIDATALIMIT_LOWER,
lower_32_bits(mhi_cntrl->iova_stop),
},
- { 0, 0, 0 }
+ {0, 0}
};
dev_dbg(dev, "Initializing MHI registers\n");
@@ -544,14 +534,22 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl)
mhi_cntrl->mhi_cmd[PRIMARY_CMD_RING].ring.db_addr = base + CRDB_LOWER;
/* Write to MMIO registers */
- for (i = 0; reg_info[i].offset; i++) {
- ret = mhi_write_reg_field(mhi_cntrl, base, reg_info[i].offset,
- reg_info[i].mask, reg_info[i].shift,
- reg_info[i].val);
- if (ret) {
- dev_err(dev, "Unable to write to MMIO registers");
- return ret;
- }
+ for (i = 0; reg_info[i].offset; i++)
+ mhi_write_reg(mhi_cntrl, base, reg_info[i].offset,
+ reg_info[i].val);
+
+ ret = mhi_write_reg_field(mhi_cntrl, base, MHICFG, MHICFG_NER_MASK,
+ MHICFG_NER_SHIFT, mhi_cntrl->total_ev_rings);
+ if (ret) {
+ dev_err(dev, "Unable to read MHICFG register\n");
+ return ret;
+ }
+
+ ret = mhi_write_reg_field(mhi_cntrl, base, MHICFG, MHICFG_NHWER_MASK,
+ MHICFG_NHWER_SHIFT, mhi_cntrl->hw_ev_rings);
+ if (ret) {
+ dev_err(dev, "Unable to read MHICFG register\n");
+ return ret;
}
return 0;
--
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