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@xxxxxxxxxxxxxx> --- 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; -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project