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drm/vc4: hdmi: Limit the BCM2711 to the max without scrambling

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[ Upstream commit 24169a2b0533a6c4030c91a7a074039e7c98fde6 ]

Unlike the previous generations, the HSM clock limitation is way above
what we can reach without scrambling, so let's move the maximum
frequency we support to the maximum clock frequency without scrambling.

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215154243.540115-9-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxime Ripard 2020-12-15 16:42:42 +01:00 committed by Greg Kroah-Hartman
parent c015d12317
commit 717325e814
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/vc4/vc4_hdmi.c
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@ -83,6 +83,8 @@
#define CEC_CLOCK_FREQ 40000
#define VC4_HSM_MID_CLOCK 149985000
#define HDMI_14_MAX_TMDS_CLK (340 * 1000 * 1000)
static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *)m->private;
@ -1939,7 +1941,7 @@ static const struct vc4_hdmi_variant bcm2711_hdmi0_variant = {
.encoder_type = VC4_ENCODER_TYPE_HDMI0,
.debugfs_name = "hdmi0_regs",
.card_name = "vc4-hdmi-0",
.max_pixel_clock = 297000000,
.max_pixel_clock = HDMI_14_MAX_TMDS_CLK,
.registers = vc5_hdmi_hdmi0_fields,
.num_registers = ARRAY_SIZE(vc5_hdmi_hdmi0_fields),
.phy_lane_mapping = {
@ -1965,7 +1967,7 @@ static const struct vc4_hdmi_variant bcm2711_hdmi1_variant = {
.encoder_type = VC4_ENCODER_TYPE_HDMI1,
.debugfs_name = "hdmi1_regs",
.card_name = "vc4-hdmi-1",
.max_pixel_clock = 297000000,
.max_pixel_clock = HDMI_14_MAX_TMDS_CLK,
.registers = vc5_hdmi_hdmi1_fields,
.num_registers = ARRAY_SIZE(vc5_hdmi_hdmi1_fields),
.phy_lane_mapping = {