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authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2019-01-17 01:59:34 +0200
committerLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2019-02-08 02:25:56 +0200
commita6cc417d3eee4ac37aa9547cf82d4ff155d1780c (patch)
tree76d9a72d3303eb693b9b71f20997048f21f9693c
parent02f2b30032c12b1b91abe5f2bd0d74ba1f700ea1 (diff)
drm: rcar-du: Turn LVDS clock output on/off for DPAD0 output on D3/E3du-next-20190208
On the D3 and E3 SoCs the LVDS PLL clock output provides the dot clock to the DU channels, even when the LVDS outputs are not in use. Enable and disable the LVDS clock output when enabling or disabling a CRTC connected to the DPAD0 output. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
-rw-r--r--drivers/gpu/drm/rcar-du/rcar_du_crtc.c34
-rw-r--r--drivers/gpu/drm/rcar-du/rcar_du_drv.h3
-rw-r--r--drivers/gpu/drm/rcar-du/rcar_du_encoder.c1
3 files changed, 38 insertions, 0 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 93ee0020c9b1..96175d48a902 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -25,6 +25,7 @@
#include "rcar_du_plane.h"
#include "rcar_du_regs.h"
#include "rcar_du_vsp.h"
+#include "rcar_lvds.h"
static u32 rcar_du_crtc_read(struct rcar_du_crtc *rcrtc, u32 reg)
{
@@ -656,8 +657,27 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+ struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(crtc->state);
+ struct rcar_du_device *rcdu = rcrtc->group->dev;
rcar_du_crtc_get(rcrtc);
+
+ /*
+ * On D3/E3 the dot clock is provided by the LVDS encoder attached to
+ * the DU channel. We need to enable its clock output explicitly if
+ * the LVDS output is disabled.
+ */
+ 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];
+ const struct drm_display_mode *mode =
+ &crtc->state->adjusted_mode;
+
+ rcar_lvds_clk_enable(encoder->base.bridge,
+ mode->clock * 1000);
+ }
+
rcar_du_crtc_start(rcrtc);
}
@@ -665,10 +685,24 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+ struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(old_state);
+ struct rcar_du_device *rcdu = rcrtc->group->dev;
rcar_du_crtc_stop(rcrtc);
rcar_du_crtc_put(rcrtc);
+ 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];
+
+ /*
+ * Disable the LVDS clock output, see
+ * rcar_du_crtc_atomic_enable().
+ */
+ rcar_lvds_clk_disable(encoder->base.bridge);
+ }
+
spin_lock_irq(&crtc->dev->event_lock);
if (crtc->state->event) {
drm_crtc_send_vblank_event(crtc, crtc->state->event);
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
index 6c187d0bf7c2..1327cd0df90a 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
@@ -22,6 +22,7 @@ struct device;
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 */
@@ -81,6 +82,8 @@ 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 rcar_du_vsp vsps[RCAR_DU_MAX_VSPS];
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index ed7ccee705cb..8ee4e762f4e5 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -41,6 +41,7 @@ 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);

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