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drm/vc4: hdmi: Enable the scrambler

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The HDMI controller on the BCM2711 includes a scrambler in order to
reach the HDMI 2.0 modes that require it. Let's add the support for it.

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210507150515.257424-11-maxime@cerno.tech
This commit is contained in:
Maxime Ripard 2021-05-07 17:05:13 +02:00
parent 86e3a65fdb
commit c85695a201
No known key found for this signature in database
GPG key ID: E3EF0D6F671851C5
2 changed files with 67 additions and 0 deletions
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64
drivers/gpu/drm/vc4/vc4_hdmi.c
View file

@ -35,6 +35,7 @@
#include <drm/drm_edid.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_scdc_helper.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/i2c.h>
@ -76,6 +77,8 @@
#define VC5_HDMI_VERTB_VSPO_SHIFT 16
#define VC5_HDMI_VERTB_VSPO_MASK VC4_MASK(29, 16)
#define VC5_HDMI_SCRAMBLER_CTL_ENABLE BIT(0)
#define VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE_SHIFT 8
#define VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE_MASK VC4_MASK(10, 8)
@ -518,6 +521,64 @@ static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
vc4_hdmi_set_hdr_infoframe(encoder);
}
static bool vc4_hdmi_supports_scrambling(struct drm_encoder *encoder,
struct drm_display_mode *mode)
{
struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
struct drm_display_info *display = &vc4_hdmi->connector.display_info;
if (!vc4_encoder->hdmi_monitor)
return false;
if (!display->hdmi.scdc.supported ||
!display->hdmi.scdc.scrambling.supported)
return false;
return true;
}
static void vc4_hdmi_enable_scrambling(struct drm_encoder *encoder)
{
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
if (!vc4_hdmi_supports_scrambling(encoder, mode))
return;
if (!vc4_hdmi_mode_needs_scrambling(mode))
return;
drm_scdc_set_high_tmds_clock_ratio(vc4_hdmi->ddc, true);
drm_scdc_set_scrambling(vc4_hdmi->ddc, true);
HDMI_WRITE(HDMI_SCRAMBLER_CTL, HDMI_READ(HDMI_SCRAMBLER_CTL) |
VC5_HDMI_SCRAMBLER_CTL_ENABLE);
}
static void vc4_hdmi_disable_scrambling(struct drm_encoder *encoder)
{
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
struct drm_crtc *crtc = encoder->crtc;
/*
* At boot, encoder->crtc will be NULL. Since we don't know the
* state of the scrambler and in order to avoid any
* inconsistency, let's disable it all the time.
*/
if (crtc && !vc4_hdmi_supports_scrambling(encoder, &crtc->mode))
return;
if (crtc && !vc4_hdmi_mode_needs_scrambling(&crtc->mode))
return;
HDMI_WRITE(HDMI_SCRAMBLER_CTL, HDMI_READ(HDMI_SCRAMBLER_CTL) &
~VC5_HDMI_SCRAMBLER_CTL_ENABLE);
drm_scdc_set_scrambling(vc4_hdmi->ddc, false);
drm_scdc_set_high_tmds_clock_ratio(vc4_hdmi->ddc, false);
}
static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder,
struct drm_atomic_state *state)
{
@ -530,6 +591,8 @@ static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder,
HDMI_WRITE(HDMI_VID_CTL,
HDMI_READ(HDMI_VID_CTL) | VC4_HD_VID_CTL_BLANKPIX);
vc4_hdmi_disable_scrambling(encoder);
}
static void vc4_hdmi_encoder_post_crtc_powerdown(struct drm_encoder *encoder,
@ -980,6 +1043,7 @@ static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
}
vc4_hdmi_recenter_fifo(vc4_hdmi);
vc4_hdmi_enable_scrambling(encoder);
}
static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)

3
drivers/gpu/drm/vc4/vc4_hdmi_regs.h
View file

@ -100,6 +100,7 @@ enum vc4_hdmi_field {
HDMI_RM_FORMAT,
HDMI_RM_OFFSET,
HDMI_SCHEDULER_CONTROL,
HDMI_SCRAMBLER_CTL,
HDMI_SW_RESET_CONTROL,
HDMI_TX_PHY_CHANNEL_SWAP,
HDMI_TX_PHY_CLK_DIV,
@ -238,6 +239,7 @@ static const struct vc4_hdmi_register __maybe_unused vc5_hdmi_hdmi0_fields[] = {
VC4_HDMI_REG(HDMI_GCP_CONFIG, 0x178),
VC4_HDMI_REG(HDMI_GCP_WORD_1, 0x17c),
VC4_HDMI_REG(HDMI_HOTPLUG, 0x1a8),
VC4_HDMI_REG(HDMI_SCRAMBLER_CTL, 0x1c4),
VC5_DVP_REG(HDMI_CLOCK_STOP, 0x0bc),
VC5_DVP_REG(HDMI_VEC_INTERFACE_XBAR, 0x0f0),
@ -317,6 +319,7 @@ static const struct vc4_hdmi_register __maybe_unused vc5_hdmi_hdmi1_fields[] = {
VC4_HDMI_REG(HDMI_GCP_CONFIG, 0x178),
VC4_HDMI_REG(HDMI_GCP_WORD_1, 0x17c),
VC4_HDMI_REG(HDMI_HOTPLUG, 0x1a8),
VC4_HDMI_REG(HDMI_SCRAMBLER_CTL, 0x1c4),
VC5_DVP_REG(HDMI_CLOCK_STOP, 0x0bc),
VC5_DVP_REG(HDMI_VEC_INTERFACE_XBAR, 0x0f0),