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drm/vc4: hdmi: Always recenter the HDMI FIFO 

In order to avoid a pixel getting stuck in an unflushable FIFO, we need to
recenter the FIFO every time we're doing a modeset and not only if we're
connected to an HDMI monitor.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b3faaf05ac6c4d3c364d28fa441571eb85903269.1599120059.git-series.maxime@cerno.tech
This commit is contained in:
Maxime Ripard 2020-09-03 10:01:43 +02:00
parent 1bb0522e92
commit 691456f622
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
1 changed files with 26 additions and 20 deletions
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46
drivers/gpu/drm/vc4/vc4_hdmi.c
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@ -425,6 +425,30 @@ static void vc4_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
(hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
}
static void vc4_hdmi_recenter_fifo(struct vc4_hdmi *vc4_hdmi)
{
u32 drift;
int ret;
drift = HDMI_READ(HDMI_FIFO_CTL);
drift &= VC4_HDMI_FIFO_VALID_WRITE_MASK;
HDMI_WRITE(HDMI_FIFO_CTL,
drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
HDMI_WRITE(HDMI_FIFO_CTL,
drift | VC4_HDMI_FIFO_CTL_RECENTER);
usleep_range(1000, 1100);
HDMI_WRITE(HDMI_FIFO_CTL,
drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
HDMI_WRITE(HDMI_FIFO_CTL,
drift | VC4_HDMI_FIFO_CTL_RECENTER);
ret = wait_for(HDMI_READ(HDMI_FIFO_CTL) &
VC4_HDMI_FIFO_CTL_RECENTER_DONE, 1);
WARN_ONCE(ret, "Timeout waiting for "
"VC4_HDMI_FIFO_CTL_RECENTER_DONE");
}
static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
{
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
@ -543,8 +567,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
}
if (vc4_encoder->hdmi_monitor) {
u32 drift;
WARN_ON(!(HDMI_READ(HDMI_SCHEDULER_CONTROL) &
VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE));
HDMI_WRITE(HDMI_SCHEDULER_CONTROL,
@ -555,25 +577,9 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
VC4_HDMI_RAM_PACKET_ENABLE);
vc4_hdmi_set_infoframes(encoder);
drift = HDMI_READ(HDMI_FIFO_CTL);
drift &= VC4_HDMI_FIFO_VALID_WRITE_MASK;
HDMI_WRITE(HDMI_FIFO_CTL,
drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
HDMI_WRITE(HDMI_FIFO_CTL,
drift | VC4_HDMI_FIFO_CTL_RECENTER);
usleep_range(1000, 1100);
HDMI_WRITE(HDMI_FIFO_CTL,
drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
HDMI_WRITE(HDMI_FIFO_CTL,
drift | VC4_HDMI_FIFO_CTL_RECENTER);
ret = wait_for(HDMI_READ(HDMI_FIFO_CTL) &
VC4_HDMI_FIFO_CTL_RECENTER_DONE, 1);
WARN_ONCE(ret, "Timeout waiting for "
"VC4_HDMI_FIFO_CTL_RECENTER_DONE");
}
vc4_hdmi_recenter_fifo(vc4_hdmi);
}
static enum drm_mode_status