drm: bridge/dw_hdmi: Add scdc operations for HDMI2.0

This patch do the following operation with scdc:

1、TMDS Configuration
   set TMDS_Bit_Clock_Ratio bit when supports TMDS Bit Rates
   above 3.4 Gbps
   (details see HDMI2.0 Specification Section 6.1.3.2)

2、Scrambling Control
   set Scrambling_Enable bit when it needs.
   (details see HDMI2.0 Specification Section 6.1.3.1)

Change-Id: Ibd4428bdf752d767caf9dd4e03f3c8d240f18f6b
Signed-off-by: Nickey Yang <nickey.yang@rock-chips.com>

diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c
index 40e183d8806838d71f5b3b74436ff1afd089aed3..50001c6fba6f36bc3d8dab244eaea4b9bf7f6607 100644 (file)
--- a/drivers/gpu/drm/bridge/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/dw-hdmi.c
@@ -29,6 +29,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_encoder_slave.h>
+#include <drm/drm_scdc_helper.h>
 #include <drm/bridge/dw_hdmi.h>
 #ifdef CONFIG_SWITCH
 #include <linux/switch.h>
@@ -1065,7 +1066,7 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi, unsigned char prep,
                              unsigned char res, int cscon)
 {
        unsigned res_idx;
-       u8 val, msec;
+       u8 val, msec, tmds_cfg;
        const struct dw_hdmi_plat_data *pdata = hdmi->plat_data;
        const struct dw_hdmi_mpll_config *mpll_config = pdata->mpll_cfg;
        const struct dw_hdmi_curr_ctrl *curr_ctrl = pdata->cur_ctr;
@@ -1127,6 +1128,16 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi, unsigned char prep,
        /* gen2 pddq */
        dw_hdmi_phy_gen2_pddq(hdmi, 1);
 
+       /* Control for TMDS Bit Period/TMDS Clock-Period Ratio */
+       if (hdmi->connector.scdc_present) {
+               drm_scdc_readb(hdmi->ddc, SCDC_TMDS_CONFIG, &tmds_cfg);
+               if (mpll_config->mpixelclock > 340000000)
+                       tmds_cfg |= 2;
+               else
+                       tmds_cfg &= 0x1;
+               drm_scdc_writeb(hdmi->ddc, SCDC_TMDS_CONFIG, tmds_cfg);
+       }
+
        /* PHY reset */
        hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_DEASSERT, HDMI_MC_PHYRSTZ);
        hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_ASSERT, HDMI_MC_PHYRSTZ);
@@ -1156,8 +1167,14 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi, unsigned char prep,
 
        dw_hdmi_phy_enable_powerdown(hdmi, false);
 
-       /* toggle TMDS enable */
+       /* toggle TMDS disable */
        dw_hdmi_phy_enable_tmds(hdmi, 0);
+
+       /* Wait for resuming transmission of TMDS clock and data */
+       if (mpll_config->mpixelclock > 340000000)
+               msleep(100);
+
+       /* toggle TMDS enable */
        dw_hdmi_phy_enable_tmds(hdmi, 1);
 
        /* gen2 tx power on */
@@ -1167,7 +1184,7 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi, unsigned char prep,
        if (is_rockchip(hdmi->dev_type))
                dw_hdmi_phy_enable_spare(hdmi, 1);
 
-       /*Wait for PHY PLL lock */
+       /* Wait for PHY PLL lock */
        msec = 5;
        do {
                val = hdmi_readb(hdmi, HDMI_PHY_STAT0) & HDMI_PHY_TX_PHY_LOCK;
@@ -1332,7 +1349,7 @@ static void hdmi_config_AVI(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
 static void hdmi_av_composer(struct dw_hdmi *hdmi,
                             const struct drm_display_mode *mode)
 {
-       u8 inv_val;
+       u8 inv_val, bytes;
        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;
@@ -1341,8 +1358,13 @@ 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 ?
+       /* Set up HDMI_FC_INVIDCONF
+        * fc_invidconf.HDCP_keepout must be set (1'b1)
+        * when activate the scrambler feature.
+        */
+       inv_val = (hdmi->hdmi_data.hdcp_enable ||
+                  vmode->mpixelclock > 340000000 ||
+                  hdmi->connector.lte_340mcsc_scramble ?
                HDMI_FC_INVIDCONF_HDCP_KEEPOUT_ACTIVE :
                HDMI_FC_INVIDCONF_HDCP_KEEPOUT_INACTIVE);
 
@@ -1391,6 +1413,26 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
                vsync_len /= 2;
        }
 
+       /* Scrambling Control */
+       if (hdmi->connector.scdc_present) {
+               if (vmode->mpixelclock > 340000000 ||
+                   hdmi->connector.lte_340mcsc_scramble) {
+                       drm_scdc_readb(&hdmi->i2c->adap, SCDC_SINK_VERSION,
+                                      &bytes);
+                       drm_scdc_writeb(&hdmi->i2c->adap, SCDC_SOURCE_VERSION,
+                                       bytes);
+                       drm_scdc_writeb(&hdmi->i2c->adap, SCDC_TMDS_CONFIG, 1);
+                       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_writeb(&hdmi->i2c->adap, SCDC_TMDS_CONFIG, 0);
+               }
+       }
+
        /* Set up horizontal active pixel width */
        hdmi_writeb(hdmi, mode->hdisplay >> 8, HDMI_FC_INHACTV1);
        hdmi_writeb(hdmi, mode->hdisplay, HDMI_FC_INHACTV0);

diff --git a/drivers/gpu/drm/bridge/dw-hdmi.h b/drivers/gpu/drm/bridge/dw-hdmi.h
index 92c41d776891ff000411a4498375004f7578acba..593ad89ec2bb95116d613a1b56127faefa55f015 100644 (file)
--- a/drivers/gpu/drm/bridge/dw-hdmi.h
+++ b/drivers/gpu/drm/bridge/dw-hdmi.h
@@ -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