90 lines
3.0 KiB
Diff
90 lines
3.0 KiB
Diff
From 32e84f4f525e2a0d7dc021b5795df34407096b0e Mon Sep 17 00:00:00 2001
|
|
From: Dom Cobley <popcornmix@gmail.com>
|
|
Date: Thu, 7 May 2020 18:16:08 +0100
|
|
Subject: [PATCH] vc4_hdmi: Adjust CEC ref clock based on its input
|
|
clock
|
|
|
|
2711 uses a fixed 27MHz input, earlier models use the HSM clock
|
|
|
|
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
|
|
---
|
|
drivers/gpu/drm/vc4/vc4_hdmi.c | 11 ++++++++---
|
|
drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +++
|
|
2 files changed, 11 insertions(+), 3 deletions(-)
|
|
|
|
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
|
|
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
|
|
@@ -79,6 +79,7 @@
|
|
# define VC4_HD_M_ENABLE BIT(0)
|
|
|
|
#define CEC_CLOCK_FREQ 40000
|
|
+#define VC4_HSM_CLOCK 163682864
|
|
|
|
static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
|
|
{
|
|
@@ -755,8 +756,7 @@ static u32 vc4_hdmi_calc_hsm_clock(struc
|
|
* needs to be a bit higher than the pixel clock rate
|
|
* (generally 148.5Mhz).
|
|
*/
|
|
-
|
|
- return 163682864;
|
|
+ return VC4_HSM_CLOCK;
|
|
}
|
|
|
|
static u32 vc5_hdmi_calc_hsm_clock(struct vc4_hdmi *vc4_hdmi, unsigned long pixel_rate)
|
|
@@ -1400,6 +1400,7 @@ static int vc4_hdmi_cec_init(struct vc4_
|
|
struct cec_connector_info conn_info;
|
|
struct platform_device *pdev = vc4_hdmi->pdev;
|
|
u32 value;
|
|
+ u32 clk_cnt;
|
|
int ret;
|
|
|
|
if (!vc4_hdmi->variant->cec_available)
|
|
@@ -1424,8 +1425,9 @@ static int vc4_hdmi_cec_init(struct vc4_
|
|
* divider: the hsm_clock rate and this divider setting will
|
|
* give a 40 kHz CEC clock.
|
|
*/
|
|
+ clk_cnt = vc4_hdmi->variant->cec_input_clock / CEC_CLOCK_FREQ;
|
|
value |= VC4_HDMI_CEC_ADDR_MASK |
|
|
- (4091 << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT);
|
|
+ ((clk_cnt-1) << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT);
|
|
HDMI_WRITE(HDMI_CEC_CNTRL_1, value);
|
|
ret = devm_request_threaded_irq(&pdev->dev, platform_get_irq(pdev, 0),
|
|
vc4_cec_irq_handler,
|
|
@@ -1770,6 +1772,7 @@ static int vc4_hdmi_dev_remove(struct pl
|
|
|
|
static const struct vc4_hdmi_variant bcm2835_variant = {
|
|
.max_pixel_clock = 162000000,
|
|
+ .cec_input_clock = VC4_HSM_CLOCK,
|
|
.audio_available = true,
|
|
.cec_available = true,
|
|
.registers = vc4_hdmi_fields,
|
|
@@ -1794,6 +1797,7 @@ static const struct vc4_hdmi_variant bcm
|
|
.id = 0,
|
|
.audio_available = true,
|
|
.max_pixel_clock = 297000000,
|
|
+ .cec_input_clock = 27000000,
|
|
.registers = vc5_hdmi_hdmi0_fields,
|
|
.num_registers = ARRAY_SIZE(vc5_hdmi_hdmi0_fields),
|
|
.phy_lane_mapping = {
|
|
@@ -1821,6 +1825,7 @@ static const struct vc4_hdmi_variant bcm
|
|
.id = 1,
|
|
.audio_available = true,
|
|
.max_pixel_clock = 297000000,
|
|
+ .cec_input_clock = 27000000,
|
|
.registers = vc5_hdmi_hdmi1_fields,
|
|
.num_registers = ARRAY_SIZE(vc5_hdmi_hdmi1_fields),
|
|
.phy_lane_mapping = {
|
|
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
|
|
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
|
|
@@ -48,6 +48,9 @@ struct vc4_hdmi_variant {
|
|
/* Maximum pixel clock supported by the controller (in Hz) */
|
|
unsigned long long max_pixel_clock;
|
|
|
|
+ /* Input clock frequency of CEC block (in Hz) */
|
|
+ unsigned long cec_input_clock;
|
|
+
|
|
/* List of the registers available on that variant */
|
|
const struct vc4_hdmi_register *registers;
|
|
|