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drm/bridge: dw-hdmi: Add SCDC and TMDS Scrambling support 

Add support for SCDC Setup for TMDS Clock > 3.4GHz and enable TMDS
Scrambling when supported or mandatory.

This patch also adds an helper to setup the control bit to support
the high TMDS Bit Period/TMDS Clock-Period Ratio as required with
TMDS Clock > 3.4GHz for HDMI2.0 3840x2160@60/50 modes.

These changes were based on work done by Huicong Xu <xhc@rock-chips.com>
and Nickey Yang <nickey.yang@rock-chips.com> to support HDMI2.0 modes
on the Rockchip 4.4 BSP kernel at [1]

[1] https://github.com/rockchip-linux/kernel/tree/release-4.4

Cc: Nickey Yang <nickey.yang@rock-chips.com>
Cc: Huicong Xu <xhc@rock-chips.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1549022873-40549-2-git-send-email-narmstrong@baylibre.com
This commit is contained in:
Neil Armstrong 2019-02-01 12:07:46 +00:00 committed by Andrzej Hajda
parent d60ea31a87
commit 264fce6cc2
3 changed files with 85 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
View File

@ -27,6 +27,7 @@
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder_slave.h>
#include <drm/drm_scdc_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/bridge/dw_hdmi.h>
@ -43,6 +44,11 @@
#define HDMI_EDID_LEN 512
/* DW-HDMI Controller >= 0x200a are at least compliant with SCDC version 1 */
#define SCDC_MIN_SOURCE_VERSION 0x1
#define HDMI14_MAX_TMDSCLK 340000000
enum hdmi_datamap {
RGB444_8B = 0x01,
RGB444_10B = 0x03,
@ -1015,6 +1021,33 @@ void dw_hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
}
EXPORT_SYMBOL_GPL(dw_hdmi_phy_i2c_write);
/*
* HDMI2.0 Specifies the following procedure for High TMDS Bit Rates:
* - The Source shall suspend transmission of the TMDS clock and data
* - The Source shall write to the TMDS_Bit_Clock_Ratio bit to change it
* from a 0 to a 1 or from a 1 to a 0
* - The Source shall allow a minimum of 1 ms and a maximum of 100 ms from
* the time the TMDS_Bit_Clock_Ratio bit is written until resuming
* transmission of TMDS clock and data
*
* To respect the 100ms maximum delay, the dw_hdmi_set_high_tmds_clock_ratio()
* helper should called right before enabling the TMDS Clock and Data in
* the PHY configuration callback.
*/
void dw_hdmi_set_high_tmds_clock_ratio(struct dw_hdmi *hdmi)
{
unsigned long mtmdsclock = hdmi->hdmi_data.video_mode.mpixelclock;
/* Control for TMDS Bit Period/TMDS Clock-Period Ratio */
if (hdmi->connector.display_info.hdmi.scdc.supported) {
if (mtmdsclock > HDMI14_MAX_TMDSCLK)
drm_scdc_set_high_tmds_clock_ratio(hdmi->ddc, 1);
else
drm_scdc_set_high_tmds_clock_ratio(hdmi->ddc, 0);
}
}
EXPORT_SYMBOL_GPL(dw_hdmi_set_high_tmds_clock_ratio);
static void dw_hdmi_phy_enable_powerdown(struct dw_hdmi *hdmi, bool enable)
{
hdmi_mask_writeb(hdmi, !enable, HDMI_PHY_CONF0,
@ -1216,6 +1249,8 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi)
dw_hdmi_phy_power_off(hdmi);
dw_hdmi_set_high_tmds_clock_ratio(hdmi);
/* Leave low power consumption mode by asserting SVSRET. */
if (phy->has_svsret)
dw_hdmi_phy_enable_svsret(hdmi, 1);
@ -1237,6 +1272,10 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi)
return ret;
}
/* Wait for resuming transmission of TMDS clock and data */
if (mpixelclock > HDMI14_MAX_TMDSCLK)
msleep(100);
return dw_hdmi_phy_power_on(hdmi);
}
@ -1504,7 +1543,8 @@ static void hdmi_config_vendor_specific_infoframe(struct dw_hdmi *hdmi,
static void hdmi_av_composer(struct dw_hdmi *hdmi,
const struct drm_display_mode *mode)
{
u8 inv_val;
u8 inv_val, bytes;
struct drm_hdmi_info *hdmi_info = &hdmi->connector.display_info.hdmi;
struct hdmi_vmode *vmode = &hdmi->hdmi_data.video_mode;
int hblank, vblank, h_de_hs, v_de_vs, hsync_len, vsync_len;
unsigned int vdisplay;
@ -1514,7 +1554,9 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
dev_dbg(hdmi->dev, "final pixclk = %d\n", vmode->mpixelclock);
/* Set up HDMI_FC_INVIDCONF */
inv_val = (hdmi->hdmi_data.hdcp_enable ?
inv_val = (hdmi->hdmi_data.hdcp_enable ||
vmode->mpixelclock > HDMI14_MAX_TMDSCLK ||
hdmi_info->scdc.scrambling.low_rates ?
HDMI_FC_INVIDCONF_HDCP_KEEPOUT_ACTIVE :
HDMI_FC_INVIDCONF_HDCP_KEEPOUT_INACTIVE);
@ -1563,6 +1605,45 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
vsync_len /= 2;
}
/* Scrambling Control */
if (hdmi_info->scdc.supported) {
if (vmode->mpixelclock > HDMI14_MAX_TMDSCLK ||
hdmi_info->scdc.scrambling.low_rates) {
/*
* HDMI2.0 Specifies the following procedure:
* After the Source Device has determined that
* SCDC_Present is set (=1), the Source Device should
* write the accurate Version of the Source Device
* to the Source Version field in the SCDCS.
* Source Devices compliant shall set the
* Source Version = 1.
*/
drm_scdc_readb(&hdmi->i2c->adap, SCDC_SINK_VERSION,
&bytes);
drm_scdc_writeb(&hdmi->i2c->adap, SCDC_SOURCE_VERSION,
min_t(u8, bytes, SCDC_MIN_SOURCE_VERSION));
/* Enabled Scrambling in the Sink */
drm_scdc_set_scrambling(&hdmi->i2c->adap, 1);
/*
* To activate the scrambler feature, you must ensure
* that the quasi-static configuration bit
* fc_invidconf.HDCP_keepout is set at configuration
* time, before the required mc_swrstzreq.tmdsswrst_req
* reset request is issued.
*/
hdmi_writeb(hdmi, (u8)~HDMI_MC_SWRSTZ_TMDSSWRST_REQ,
HDMI_MC_SWRSTZ);
hdmi_writeb(hdmi, 1, HDMI_FC_SCRAMBLER_CTRL);
} else {
hdmi_writeb(hdmi, 0, HDMI_FC_SCRAMBLER_CTRL);
hdmi_writeb(hdmi, (u8)~HDMI_MC_SWRSTZ_TMDSSWRST_REQ,
HDMI_MC_SWRSTZ);
drm_scdc_set_scrambling(&hdmi->i2c->adap, 0);
}
}
/* Set up horizontal active pixel width */
hdmi_writeb(hdmi, mode->hdisplay >> 8, HDMI_FC_INHACTV1);
hdmi_writeb(hdmi, mode->hdisplay, HDMI_FC_INHACTV0);

1
drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
View File

@ -255,6 +255,7 @@
#define HDMI_FC_MASK2 0x10DA
#define HDMI_FC_POL2 0x10DB
#define HDMI_FC_PRCONF 0x10E0
#define HDMI_FC_SCRAMBLER_CTRL 0x10E1
#define HDMI_FC_GMD_STAT 0x1100
#define HDMI_FC_GMD_EN 0x1101

1
include/drm/bridge/dw_hdmi.h
View File

@ -159,6 +159,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
void dw_hdmi_set_high_tmds_clock_ratio(struct dw_hdmi *hdmi);
/* PHY configuration */
void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address);