From: Hemant Kumar <hemantk@codeaurora.org>
To: manivannan.sadhasivam@linaro.org
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
jhugo@codeaurora.org, bbhatt@codeaurora.org,
loic.poulain@linaro.org, Hemant Kumar <hemantk@codeaurora.org>
Subject: [PATCH v1 1/2] bus: mhi: core: Count number of HW channels supported by controller
Date: Fri, 23 Oct 2020 19:00:42 -0700 [thread overview]
Message-ID: <1603504843-38557-2-git-send-email-hemantk@codeaurora.org> (raw)
In-Reply-To: <1603504843-38557-1-git-send-email-hemantk@codeaurora.org>
Device provides the total number of HW channels it supports using MHI
configuration register. Host supported HW channels shall not exceed
that value. In order to make this check, a counter is needed to store
total number of HW channels required by host.
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
---
drivers/bus/mhi/core/init.c | 2 ++
drivers/bus/mhi/core/internal.h | 1 +
include/linux/mhi.h | 1 +
3 files changed, 4 insertions(+)
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 0ffdebd..70fd6af 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -725,6 +725,8 @@ static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
mhi_chan = &mhi_cntrl->mhi_chan[chan];
mhi_chan->name = ch_cfg->name;
mhi_chan->chan = chan;
+ if (chan >= MHI_HW_CHAN_START_IDX)
+ mhi_cntrl->hw_chan++;
mhi_chan->tre_ring.elements = ch_cfg->num_elements;
if (!mhi_chan->tre_ring.elements)
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index 7989269..3d8e480 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -454,6 +454,7 @@ enum mhi_pm_state {
#define PRIMARY_CMD_RING 0
#define MHI_DEV_WAKE_DB 127
#define MHI_MAX_MTU 0xffff
+#define MHI_HW_CHAN_START_IDX 100
#define MHI_RANDOM_U32_NONZERO(bmsk) (prandom_u32_max(bmsk) + 1)
enum mhi_er_type {
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index d4841e5..ea441d2 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -389,6 +389,7 @@ struct mhi_controller {
struct list_head lpm_chans;
int *irq;
u32 max_chan;
+ u32 hw_chan;
u32 total_ev_rings;
u32 hw_ev_rings;
u32 sw_ev_rings;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-10-24 2:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-24 2:00 [PATCH v1 0/2] Check for device supported event rings and channels Hemant Kumar
2020-10-24 2:00 ` Hemant Kumar [this message]
2020-11-06 8:00 ` [PATCH v1 1/2] bus: mhi: core: Count number of HW channels supported by controller Manivannan Sadhasivam
2020-10-24 2:00 ` [PATCH v1 2/2] bus: mhi: core: Check for device supported event rings and channels Hemant Kumar
2020-11-06 8:06 ` Manivannan Sadhasivam
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