linux-kernel - [PATCH 1/2] drm/msm/dpu: Add a function to retrieve the current CTL status

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Message-Id: <20210901174347.1012129-1-angelogioacchino.delregno@somainline.org>
Date:   Wed,  1 Sep 2021 19:43:46 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     robdclark@...il.com
Cc:     sean@...rly.run, airlied@...ux.ie, daniel@...ll.ch,
        dmitry.baryshkov@...aro.org, abhinavk@...eaurora.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, paul.bouchara@...ainline.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Subject: [PATCH 1/2] drm/msm/dpu: Add a function to retrieve the current CTL status

Add a function that returns whether the requested CTL is active or not:
this will be used in a later commit to fix command mode panel issues.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 6 ++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
index 64740ddb983e..3b6fd73eb3a8 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
@@ -91,6 +91,11 @@ static inline void dpu_hw_ctl_trigger_start(struct dpu_hw_ctl *ctx)
 	DPU_REG_WRITE(&ctx->hw, CTL_START, 0x1);
 }
 
+static inline bool dpu_hw_ctl_is_started(struct dpu_hw_ctl *ctx)
+{
+	return !!(DPU_REG_READ(&ctx->hw, CTL_START) & BIT(0));
+}
+
 static inline void dpu_hw_ctl_trigger_pending(struct dpu_hw_ctl *ctx)
 {
 	trace_dpu_hw_ctl_trigger_prepare(ctx->pending_flush_mask,
@@ -579,6 +584,7 @@ static void _setup_ctl_ops(struct dpu_hw_ctl_ops *ops,
 	ops->get_pending_flush = dpu_hw_ctl_get_pending_flush;
 	ops->get_flush_register = dpu_hw_ctl_get_flush_register;
 	ops->trigger_start = dpu_hw_ctl_trigger_start;
+	ops->is_started = dpu_hw_ctl_is_started;
 	ops->trigger_pending = dpu_hw_ctl_trigger_pending;
 	ops->reset = dpu_hw_ctl_reset_control;
 	ops->wait_reset_status = dpu_hw_ctl_wait_reset_status;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
index 806c171e5df2..ac1544474022 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
@@ -61,6 +61,13 @@ struct dpu_hw_ctl_ops {
 	 */
 	void (*trigger_start)(struct dpu_hw_ctl *ctx);
 
+	/**
+	 * check if the ctl is started
+	 * @ctx       : ctl path ctx pointer
+	 * @Return: true if started, false if stopped
+	 */
+	bool (*is_started)(struct dpu_hw_ctl *ctx);
+
 	/**
 	 * kickoff prepare is in progress hw operation for sw
 	 * controlled interfaces: DSI cmd mode and WB interface
-- 
2.32.0