linux-kernel - [PATCH 2/6] drm/vc4: dsi: Move initialisation to encoder_mode

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Message-Id: <20221207-rpi-dsi-bridge-v1-2-8f68ee0b0adb@cerno.tech>
Date:   Wed, 07 Dec 2022 11:22:45 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Emma Anholt <emma@...olt.net>, Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maxime Ripard <maxime@...no.tech>
Subject: [PATCH 2/6] drm/vc4: dsi: Move initialisation to encoder_mode_set

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

Breaking the bridge chain does not work for atomic bridges/panels
and generally causes issues.
We need to initialise the DSI host before the bridge pre_enables
are called, so move that to encoder_mode_set in the same way that
dw-mipi-dsi does.

Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_dsi.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index d9d951e9ab7c..607ebe368409 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -867,18 +867,18 @@ static bool vc4_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
 	return true;
 }
 
-static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
+static void vc4_dsi_encoder_mode_set(struct drm_encoder *encoder,
+				     struct drm_display_mode *mode,
+				     struct drm_display_mode *adjusted_mode)
 {
-	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 	struct vc4_dsi *dsi = to_vc4_dsi(encoder);
 	struct device *dev = &dsi->pdev->dev;
 	bool debug_dump_regs = false;
-	struct drm_bridge *iter;
 	unsigned long hs_clock;
 	u32 ui_ns;
 	/* Minimum LP state duration in escape clock cycles. */
 	u32 lpx = dsi_esc_timing(60);
-	unsigned long pixel_clock_hz = mode->clock * 1000;
+	unsigned long pixel_clock_hz = adjusted_mode->clock * 1000;
 	unsigned long dsip_clock;
 	unsigned long phy_clock;
 	int ret;
@@ -1105,6 +1105,13 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
 		       ~DSI_PORT_BIT(PHY_AFEC0_RESET));
 
 	vc4_dsi_ulps(dsi, false);
+}
+
+static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
+{
+	struct vc4_dsi *dsi = to_vc4_dsi(encoder);
+	bool debug_dump_regs = false;
+	struct drm_bridge *iter;
 
 	list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
 		if (iter->funcs->pre_enable)
@@ -1370,6 +1377,7 @@ static const struct drm_encoder_helper_funcs vc4_dsi_encoder_helper_funcs = {
 	.disable = vc4_dsi_encoder_disable,
 	.enable = vc4_dsi_encoder_enable,
 	.mode_fixup = vc4_dsi_encoder_mode_fixup,
+	.mode_set = vc4_dsi_encoder_mode_set,
 };
 
 static int vc4_dsi_late_register(struct drm_encoder *encoder)

-- 
2.38.1