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drm/vc4: hdmi: Switch to blank pixels when disabled

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In order to avoid pixels getting stuck in an unflushable FIFO, we need when
we disable the HDMI controller to switch away from getting our pixels from
the pixelvalve and instead use blank pixels, and switch back to the
pixelvalve when we enable the HDMI controller.

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/fde3efb1ad79f4476a73d310cbba3ec07dc6dabe.1599120059.git-series.maxime@cerno.tech
This commit is contained in:
Maxime Ripard 2020-09-03 10:01:46 +02:00
parent 8b3f90e98e
commit 81d830137b
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
2 changed files with 12 additions and 0 deletions
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9
drivers/gpu/drm/vc4/vc4_hdmi.c
View File

@ -325,6 +325,12 @@ static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder)
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
HDMI_WRITE(HDMI_RAM_PACKET_CONFIG, 0);
HDMI_WRITE(HDMI_VID_CTL, HDMI_READ(HDMI_VID_CTL) |
VC4_HD_VID_CTL_CLRRGB | VC4_HD_VID_CTL_CLRSYNC);
HDMI_WRITE(HDMI_VID_CTL,
HDMI_READ(HDMI_VID_CTL) | VC4_HD_VID_CTL_BLANKPIX);
}
static void vc4_hdmi_encoder_post_crtc_powerdown(struct drm_encoder *encoder)
@ -563,6 +569,9 @@ static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder)
(vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
(hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
HDMI_WRITE(HDMI_VID_CTL,
HDMI_READ(HDMI_VID_CTL) & ~VC4_HD_VID_CTL_BLANKPIX);
if (vc4_encoder->hdmi_monitor) {
HDMI_WRITE(HDMI_SCHEDULER_CONTROL,
HDMI_READ(HDMI_SCHEDULER_CONTROL) |

3
drivers/gpu/drm/vc4/vc4_regs.h
View File

@ -723,6 +723,9 @@
# define VC4_HD_VID_CTL_FRAME_COUNTER_RESET BIT(29)
# define VC4_HD_VID_CTL_VSYNC_LOW BIT(28)
# define VC4_HD_VID_CTL_HSYNC_LOW BIT(27)
# define VC4_HD_VID_CTL_CLRSYNC BIT(24)
# define VC4_HD_VID_CTL_CLRRGB BIT(23)
# define VC4_HD_VID_CTL_BLANKPIX BIT(18)
# define VC4_HD_CSC_CTL_ORDER_MASK VC4_MASK(7, 5)
# define VC4_HD_CSC_CTL_ORDER_SHIFT 5