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From: Jayesh Choudhary <j-choudhary@ti.com>
To: <linux-kernel@vger.kernel.org>, <andrzej.hajda@intel.com>,
        <neil.armstrong@linaro.org>, <rfoss@kernel.org>,
        <Laurent.pinchart@ideasonboard.com>, <mripard@kernel.org>,
        <dri-devel@lists.freedesktop.org>, <j-choudhary@ti.com>
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        <maarten.lankhorst@linux.intel.com>, <tzimmermann@suse.de>,
        <airlied@gmail.com>, <daniel@ffwll.ch>, <a-bhatia1@ti.com>
Subject: [PATCH v2 2/2] drm/bridge: Add pixel clock check in atomic_check
Date: Fri, 24 May 2024 13:03:05 +0530
Message-ID: <20240524073305.107293-3-j-choudhary@ti.com>
In-Reply-To: <20240524073305.107293-1-j-choudhary@ti.com>
References: <20240524073305.107293-1-j-choudhary@ti.com>
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Check the pixel clock for the mode in atomic_check and ensure that
it is within the range supported by the bridge.

Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
---
 drivers/gpu/drm/bridge/sii902x.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index ef7c3ab3386c..a5b7ee1e3bbe 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -517,11 +517,16 @@ static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
 				       struct drm_crtc_state *crtc_state,
 				       struct drm_connector_state *conn_state)
 {
+	if (crtc_state->mode.clock < SII902X_MIN_PIXEL_CLOCK_KHZ)
+		return MODE_CLOCK_LOW;
+
+	if (crtc_state->mode.clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
+		return MODE_CLOCK_HIGH;
+
 	/*
 	 * There might be flags negotiation supported in future but
 	 * set the bus flags in atomic_check statically for now.
 	 */
-
 	bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags;
 
 	return 0;
-- 
2.25.1