From: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
[ Upstream commit 53ced169373aab52d3b5da0fee6a342002d1876d ]
On D3 and E3 platforms, the LVDS encoder includes a PLL that can
generate a clock for the corresponding CRTC, used even when the CRTC
output to a non-LVDS port. This mechanism is supported by the driver,
but the implementation is broken in dual-link LVDS mode. In that case,
the LVDS1 drm_encoder is skipped, which causes a crash when trying to
access its bridge later on.
Fix this by storing bridge pointers internally instead of retrieving
them from the encoder. The rcar_du_device encoders field isn't used
anymore and can be dropped.
Fixes: 8e8fddab0d0a ("drm: rcar-du: Skip LVDS1 output on Gen3 when using
dual-link LVDS mode")
Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 10 ++--------
drivers/gpu/drm/rcar-du/rcar_du_drv.h | 6 +++---
drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 5 ++++-
3 files changed, 9 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index fe86a3e677571..1b9738e44909d 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -727,13 +727,10 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc
*crtc,
*/
if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index) &&
rstate->outputs == BIT(RCAR_DU_OUTPUT_DPAD0)) {
- struct rcar_du_encoder *encoder =
- rcdu->encoders[RCAR_DU_OUTPUT_LVDS0 + rcrtc->index];
+ struct drm_bridge *bridge = rcdu->lvds[rcrtc->index];
const struct drm_display_mode *mode =
&crtc->state->adjusted_mode;
- struct drm_bridge *bridge;
- bridge = drm_bridge_chain_get_first_bridge(&encoder->base);
rcar_lvds_clk_enable(bridge, mode->clock * 1000);
}
@@ -759,15 +756,12 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc
*crtc,
if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index) &&
rstate->outputs == BIT(RCAR_DU_OUTPUT_DPAD0)) {
- struct rcar_du_encoder *encoder =
- rcdu->encoders[RCAR_DU_OUTPUT_LVDS0 + rcrtc->index];
- struct drm_bridge *bridge;
+ struct drm_bridge *bridge = rcdu->lvds[rcrtc->index];
/*
* Disable the LVDS clock output, see
* rcar_du_crtc_atomic_enable().
*/
- bridge = drm_bridge_chain_get_first_bridge(&encoder->base);
rcar_lvds_clk_disable(bridge);
}
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
index 61504c54e2ecf..3597a179bfb78 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
@@ -20,10 +20,10 @@
struct clk;
struct device;
+struct drm_bridge;
struct drm_device;
struct drm_property;
struct rcar_du_device;
-struct rcar_du_encoder;
#define RCAR_DU_FEATURE_CRTC_IRQ_CLOCK BIT(0) /* Per-CRTC IRQ and clock */
#define RCAR_DU_FEATURE_VSP1_SOURCE BIT(1) /* Has inputs from VSP1 */
@@ -71,6 +71,7 @@ struct rcar_du_device_info {
#define RCAR_DU_MAX_CRTCS 4
#define RCAR_DU_MAX_GROUPS DIV_ROUND_UP(RCAR_DU_MAX_CRTCS, 2)
#define RCAR_DU_MAX_VSPS 4
+#define RCAR_DU_MAX_LVDS 2
struct rcar_du_device {
struct device *dev;
@@ -83,11 +84,10 @@ struct rcar_du_device {
struct rcar_du_crtc crtcs[RCAR_DU_MAX_CRTCS];
unsigned int num_crtcs;
- struct rcar_du_encoder *encoders[RCAR_DU_OUTPUT_MAX];
-
struct rcar_du_group groups[RCAR_DU_MAX_GROUPS];
struct platform_device *cmms[RCAR_DU_MAX_CRTCS];
struct rcar_du_vsp vsps[RCAR_DU_MAX_VSPS];
+ struct drm_bridge *lvds[RCAR_DU_MAX_LVDS];
struct {
struct drm_property *colorkey;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index b0335da0c1614..50fc14534fa4d 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -57,7 +57,6 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
if (renc == NULL)
return -ENOMEM;
- rcdu->encoders[output] = renc;
renc->output = output;
encoder = rcar_encoder_to_drm_encoder(renc);
@@ -91,6 +90,10 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
ret = -EPROBE_DEFER;
goto done;
}
+
+ if (output == RCAR_DU_OUTPUT_LVDS0 ||
+ output == RCAR_DU_OUTPUT_LVDS1)
+ rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;
}
/*
--
2.27.0
