linux-kernel - [PATCH v1 1/2] bus: mhi: core: Count number of HW channels supported by controller

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Message-Id: <1603504843-38557-2-git-send-email-hemantk@codeaurora.org>
Date:   Fri, 23 Oct 2020 19:00:42 -0700
From:   Hemant Kumar <hemantk@...eaurora.org>
To:     manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        jhugo@...eaurora.org, bbhatt@...eaurora.org,
        loic.poulain@...aro.org, Hemant Kumar <hemantk@...eaurora.org>
Subject: [PATCH v1 1/2] bus: mhi: core: Count number of HW channels supported by controller

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@...eaurora.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;
-- 
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