[PATCH 3/3] drm/vc4: hdmi: Add pixel bvb clock control

[Hoegeun Kwon]

There is a problem that the output does not work at a resolution
exceeding FHD. To solve this, we need to adjust the bvb clock at a
resolution exceeding FHD.

Signed-off-by: Hoegeun Kwon <hoegeun.k...@samsung.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 25 +++++++++++++++++++++++++
 drivers/gpu/drm/vc4/vc4_hdmi.h |  1 +
 2 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 95ec5eedea39..eb3192d1fd86 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -80,6 +80,7 @@
 # define VC4_HD_M_ENABLE                       BIT(0)
 
 #define CEC_CLOCK_FREQ 40000
+#define VC4_HSM_MID_CLOCK 149985000
 
 static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
 {
@@ -380,6 +381,7 @@ static void vc4_hdmi_encoder_post_crtc_powerdown(struct 
drm_encoder *encoder)
        HDMI_WRITE(HDMI_VID_CTL,
                   HDMI_READ(HDMI_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
 
+       clk_disable_unprepare(vc4_hdmi->pixel_bvb_clock);
        clk_disable_unprepare(vc4_hdmi->hsm_clock);
        clk_disable_unprepare(vc4_hdmi->pixel_clock);
 
@@ -638,6 +640,23 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct 
drm_encoder *encoder)
                return;
        }
 
+       ret = clk_set_rate(vc4_hdmi->pixel_bvb_clock,
+                       (hsm_rate > VC4_HSM_MID_CLOCK ? 150000000 : 75000000));
+       if (ret) {
+               DRM_ERROR("Failed to set pixel bvb clock rate: %d\n", ret);
+               clk_disable_unprepare(vc4_hdmi->hsm_clock);
+               clk_disable_unprepare(vc4_hdmi->pixel_clock);
+               return;
+       }
+
+       ret = clk_prepare_enable(vc4_hdmi->pixel_bvb_clock);
+       if (ret) {
+               DRM_ERROR("Failed to turn on pixel bvb clock: %d\n", ret);
+               clk_disable_unprepare(vc4_hdmi->hsm_clock);
+               clk_disable_unprepare(vc4_hdmi->pixel_clock);
+               return;
+       }
+
        if (vc4_hdmi->variant->reset)
                vc4_hdmi->variant->reset(vc4_hdmi);
 
@@ -1593,6 +1612,12 @@ static int vc5_hdmi_init_resources(struct vc4_hdmi 
*vc4_hdmi)
                return PTR_ERR(vc4_hdmi->audio_clock);
        }
 
+       vc4_hdmi->pixel_bvb_clock = devm_clk_get(dev, "bvb");
+       if (IS_ERR(vc4_hdmi->pixel_bvb_clock)) {
+               DRM_ERROR("Failed to get pixel bvb clock\n");
+               return PTR_ERR(vc4_hdmi->pixel_bvb_clock);
+       }
+
        vc4_hdmi->reset = devm_reset_control_get(dev, NULL);
        if (IS_ERR(vc4_hdmi->reset)) {
                DRM_ERROR("Failed to get HDMI reset line\n");
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
index 0806c6d9f24e..63c6f8bddf1d 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -147,6 +147,7 @@ struct vc4_hdmi {
        struct clk *pixel_clock;
        struct clk *hsm_clock;
        struct clk *audio_clock;
+       struct clk *pixel_bvb_clock;
 
        struct reset_control *reset;
 
-- 
2.17.1