[PATCH v3 08/15] drm/mxsfb: Signal mode changed when bpp changed

From: Robert Chiras <robert.chiras@nxp•com>
To: "Guido Günther" <agx@sigxcpu•org>, "Marek Vasut" <marex@denx•de>,
	"Stefan Agner" <stefan@agner•ch>,
	"David Airlie" <airlied@linux•ie>,
	"Daniel Vetter" <daniel@ffwll•ch>,
	"Rob Herring" <robh+dt@kernel•org>,
	"Mark Rutland" <mark.rutland@arm•com>,
	"Shawn Guo" <shawnguo@kernel•org>,
	"Sascha Hauer" <s.hauer@pengutronix•de>,
	"Fabio Estevam" <festevam@gmail•com>
Cc: devicetree@vger•kernel.org, linux-kernel@vger•kernel.org,
	dri-devel@lists•freedesktop.org,
	NXP Linux Team <linux-imx@nxp•com>,
	Pengutronix Kernel Team <kernel@pengutronix•de>,
	linux-arm-kernel@lists•infradead.org
Subject: [PATCH v3 08/15] drm/mxsfb: Signal mode changed when bpp changed
Date: Wed, 21 Aug 2019 13:15:48 +0300	[thread overview]
Message-ID: <1566382555-12102-9-git-send-email-robert.chiras@nxp.com> (raw)
In-Reply-To: <1566382555-12102-1-git-send-email-robert.chiras@nxp.com>

From: Mirela Rabulea <mirela.rabulea@nxp•com>

Add mxsfb_atomic_helper_check to signal mode changed when bpp changed.
This will trigger the execution of disable/enable on
a modeset with different bpp than the current one.

Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp•com>
Signed-off-by: Robert Chiras <robert.chiras@nxp•com>
---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 45 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 78a2382..f51c8a3 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -26,6 +26,7 @@
 #include <drm/drm_drv.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_irq.h>
@@ -108,9 +109,51 @@ void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
 		clk_disable_unprepare(mxsfb->clk_axi);
 }
 
+/**
+ * mxsfb_atomic_helper_check - validate state object
+ * @dev: DRM device
+ * @state: the driver state object
+ *
+ * On top of the drm imlementation drm_atomic_helper_check,
+ * check if the bpp is changed, if so, signal mode_changed,
+ * this will trigger disable/enable
+ *
+ * RETURNS:
+ * Zero for success or -errno
+ */
+static int mxsfb_atomic_helper_check(struct drm_device *dev,
+				     struct drm_atomic_state *state)
+{
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_state;
+	int i, ret;
+
+	ret = drm_atomic_helper_check(dev, state);
+	if (ret)
+		return ret;
+
+	for_each_new_crtc_in_state(state, crtc, new_state, i) {
+		struct drm_plane_state *primary_state;
+		int old_bpp = 0;
+		int new_bpp = 0;
+
+		if (!crtc->primary || !crtc->primary->old_fb)
+			continue;
+		primary_state =
+			drm_atomic_get_plane_state(state, crtc->primary);
+		if (!primary_state || !primary_state->fb)
+			continue;
+		old_bpp = crtc->primary->old_fb->format->depth;
+		new_bpp = primary_state->fb->format->depth;
+		if (old_bpp != new_bpp)
+			new_state->mode_changed = true;
+	}
+	return ret;
+}
+
 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
 	.fb_create		= drm_gem_fb_create,
-	.atomic_check		= drm_atomic_helper_check,
+	.atomic_check		= mxsfb_atomic_helper_check,
 	.atomic_commit		= drm_atomic_helper_commit,
 };
 
-- 
2.7.4


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