drm/meson: vclk: add support for YUV420 setup

This patch adds clocking support for the YUV420 output from the
Amlogic Meson SoCs Video Processing Unit to the HDMI Controller.

The YUV420 is obtained by generating a YUV444 pixel stream like
the classic HDMI display modes, but then the Video Encoder output
can be configured to down-sample the YUV444 pixel stream to a YUV420
stream.

This mode needs a different clock generation scheme since the TMDS PHY
clock must match the 10x ratio with the YUV420 pixel clock, but
the video encoder must run at 2x the pixel clock.

This patch adds the TMDS PHY clock value in all the video clock setup
in order to better support these specific uses cases and switch
to the Common Clock framework for clocks handling in the future.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Jernej Škrabec <jernej.skrabec@siol.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200304104052.17196-11-narmstrong@baylibre.com

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index b2105c0fe205ce8299fe3f970041516888dd5bc4..b5b0d45eb31481ef6354096ba07788163fd70664 100644 (file)
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -376,15 +376,19 @@ static void dw_hdmi_set_vclk(struct meson_dw_hdmi *dw_hdmi,
 {
        struct meson_drm *priv = dw_hdmi->priv;
        int vic = drm_match_cea_mode(mode);
+       unsigned int phy_freq;
        unsigned int vclk_freq;
        unsigned int venc_freq;
        unsigned int hdmi_freq;
 
        vclk_freq = mode->clock;
 
+       /* TMDS clock is pixel_clock * 10 */
+       phy_freq = vclk_freq * 10;
+
        if (!vic) {
-               meson_vclk_setup(priv, MESON_VCLK_TARGET_DMT, vclk_freq,
-                                vclk_freq, vclk_freq, false);
+               meson_vclk_setup(priv, MESON_VCLK_TARGET_DMT, phy_freq,
+                                vclk_freq, vclk_freq, vclk_freq, false);
                return;
        }
 
@@ -402,11 +406,11 @@ static void dw_hdmi_set_vclk(struct meson_dw_hdmi *dw_hdmi,
        if (mode->flags & DRM_MODE_FLAG_DBLCLK)
                venc_freq /= 2;
 
-       DRM_DEBUG_DRIVER("vclk:%d venc=%d hdmi=%d enci=%d\n",
-               vclk_freq, venc_freq, hdmi_freq,
+       DRM_DEBUG_DRIVER("vclk:%d phy=%d venc=%d hdmi=%d enci=%d\n",
+               phy_freq, vclk_freq, venc_freq, hdmi_freq,
                priv->venc.hdmi_use_enci);
 
-       meson_vclk_setup(priv, MESON_VCLK_TARGET_HDMI, vclk_freq,
+       meson_vclk_setup(priv, MESON_VCLK_TARGET_HDMI, phy_freq, vclk_freq,
                         venc_freq, hdmi_freq, priv->venc.hdmi_use_enci);
 }
 
@@ -617,6 +621,7 @@ dw_hdmi_mode_valid(struct drm_connector *connector,
                   const struct drm_display_mode *mode)
 {
        struct meson_drm *priv = connector->dev->dev_private;
+       unsigned int phy_freq;
        unsigned int vclk_freq;
        unsigned int venc_freq;
        unsigned int hdmi_freq;
@@ -643,6 +648,9 @@ dw_hdmi_mode_valid(struct drm_connector *connector,
 
        vclk_freq = mode->clock;
 
+       /* TMDS clock is pixel_clock * 10 */
+       phy_freq = vclk_freq * 10;
+
        /* 480i/576i needs global pixel doubling */
        if (mode->flags & DRM_MODE_FLAG_DBLCLK)
                vclk_freq *= 2;
@@ -659,10 +667,10 @@ dw_hdmi_mode_valid(struct drm_connector *connector,
        if (mode->flags & DRM_MODE_FLAG_DBLCLK)
                venc_freq /= 2;
 
-       dev_dbg(connector->dev->dev, "%s: vclk:%d venc=%d hdmi=%d\n", __func__,
-               vclk_freq, venc_freq, hdmi_freq);
+       dev_dbg(connector->dev->dev, "%s: vclk:%d phy=%d venc=%d hdmi=%d\n",
+               __func__, phy_freq, vclk_freq, venc_freq, hdmi_freq);
 
-       return meson_vclk_vic_supported_freq(vclk_freq);
+       return meson_vclk_vic_supported_freq(phy_freq, vclk_freq);
 }
 
 /* Encoder */

diff --git a/drivers/gpu/drm/meson/meson_vclk.c b/drivers/gpu/drm/meson/meson_vclk.c
index f690793ae2d573f8cd01dfe54fa02bf6867e34f8..fdf26dac9fa8ed8f7c0f9b56e83b48b790f5bc1e 100644 (file)
--- a/drivers/gpu/drm/meson/meson_vclk.c
+++ b/drivers/gpu/drm/meson/meson_vclk.c
@@ -354,12 +354,17 @@ enum {
 /* 2970 /1 /1 /1 /5 /2  => /1 /1 */
        MESON_VCLK_HDMI_297000,
 /* 5940 /1 /1 /2 /5 /1  => /1 /1 */
-       MESON_VCLK_HDMI_594000
+       MESON_VCLK_HDMI_594000,
+/* 2970 /1 /1 /1 /5 /1  => /1 /2 */
+       MESON_VCLK_HDMI_594000_YUV420,
 };
 
 struct meson_vclk_params {
+       unsigned int pll_freq;
+       unsigned int phy_freq;
+       unsigned int vclk_freq;
+       unsigned int venc_freq;
        unsigned int pixel_freq;
-       unsigned int pll_base_freq;
        unsigned int pll_od1;
        unsigned int pll_od2;
        unsigned int pll_od3;
@@ -367,8 +372,11 @@ struct meson_vclk_params {
        unsigned int vclk_div;
 } params[] = {
        [MESON_VCLK_HDMI_ENCI_54000] = {
+               .pll_freq = 4320000,
+               .phy_freq = 270000,
+               .vclk_freq = 54000,
+               .venc_freq = 54000,
                .pixel_freq = 54000,
-               .pll_base_freq = 4320000,
                .pll_od1 = 4,
                .pll_od2 = 4,
                .pll_od3 = 1,
@@ -376,8 +384,11 @@ struct meson_vclk_params {
                .vclk_div = 1,
        },
        [MESON_VCLK_HDMI_DDR_54000] = {
-               .pixel_freq = 54000,
-               .pll_base_freq = 4320000,
+               .pll_freq = 4320000,
+               .phy_freq = 270000,
+               .vclk_freq = 54000,
+               .venc_freq = 54000,
+               .pixel_freq = 27000,
                .pll_od1 = 4,
                .pll_od2 = 4,
                .pll_od3 = 1,
@@ -385,8 +396,11 @@ struct meson_vclk_params {
                .vclk_div = 1,
        },
        [MESON_VCLK_HDMI_DDR_148500] = {
-               .pixel_freq = 148500,
-               .pll_base_freq = 2970000,
+               .pll_freq = 2970000,
+               .phy_freq = 742500,
+               .vclk_freq = 148500,
+               .venc_freq = 148500,
+               .pixel_freq = 74250,
                .pll_od1 = 4,
                .pll_od2 = 1,
                .pll_od3 = 1,
@@ -394,8 +408,11 @@ struct meson_vclk_params {
                .vclk_div = 1,
        },
        [MESON_VCLK_HDMI_74250] = {
+               .pll_freq = 2970000,
+               .phy_freq = 742500,
+               .vclk_freq = 74250,
+               .venc_freq = 74250,
                .pixel_freq = 74250,
-               .pll_base_freq = 2970000,
                .pll_od1 = 2,
                .pll_od2 = 2,
                .pll_od3 = 2,
@@ -403,8 +420,11 @@ struct meson_vclk_params {
                .vclk_div = 1,
        },
        [MESON_VCLK_HDMI_148500] = {
+               .pll_freq = 2970000,
+               .phy_freq = 1485000,
+               .vclk_freq = 148500,
+               .venc_freq = 148500,
                .pixel_freq = 148500,
-               .pll_base_freq = 2970000,
                .pll_od1 = 1,
                .pll_od2 = 2,
                .pll_od3 = 2,
@@ -412,8 +432,11 @@ struct meson_vclk_params {
                .vclk_div = 1,
        },
        [MESON_VCLK_HDMI_297000] = {
+               .pll_freq = 5940000,
+               .phy_freq = 2970000,
+               .venc_freq = 297000,
+               .vclk_freq = 297000,
                .pixel_freq = 297000,
-               .pll_base_freq = 5940000,
                .pll_od1 = 2,
                .pll_od2 = 1,
                .pll_od3 = 1,
@@ -421,14 +444,29 @@ struct meson_vclk_params {
                .vclk_div = 2,
        },
        [MESON_VCLK_HDMI_594000] = {
+               .pll_freq = 5940000,
+               .phy_freq = 5940000,
+               .venc_freq = 594000,
+               .vclk_freq = 594000,
                .pixel_freq = 594000,
-               .pll_base_freq = 5940000,
                .pll_od1 = 1,
                .pll_od2 = 1,
                .pll_od3 = 2,
                .vid_pll_div = VID_PLL_DIV_5,
                .vclk_div = 1,
        },
+       [MESON_VCLK_HDMI_594000_YUV420] = {
+               .pll_freq = 5940000,
+               .phy_freq = 2970000,
+               .venc_freq = 594000,
+               .vclk_freq = 594000,
+               .pixel_freq = 297000,
+               .pll_od1 = 2,
+               .pll_od2 = 1,
+               .pll_od3 = 1,
+               .vid_pll_div = VID_PLL_DIV_5,
+               .vclk_div = 1,
+       },
        { /* sentinel */ },
 };
 
@@ -701,6 +739,7 @@ static void meson_hdmi_pll_generic_set(struct meson_drm *priv,
        unsigned int od, m, frac, od1, od2, od3;
 
        if (meson_hdmi_pll_find_params(priv, pll_freq, &m, &frac, &od)) {
+               /* OD2 goes to the PHY, and needs to be *10, so keep OD3=1 */
                od3 = 1;
                if (od < 4) {
                        od1 = 2;
@@ -723,21 +762,28 @@ static void meson_hdmi_pll_generic_set(struct meson_drm *priv,
 }
 
 enum drm_mode_status
-meson_vclk_vic_supported_freq(unsigned int freq)
+meson_vclk_vic_supported_freq(unsigned int phy_freq,
+                             unsigned int vclk_freq)
 {
        int i;
 
-       DRM_DEBUG_DRIVER("freq = %d\n", freq);
+       DRM_DEBUG_DRIVER("phy_freq = %d vclk_freq = %d\n",
+                        phy_freq, vclk_freq);
 
        for (i = 0 ; params[i].pixel_freq ; ++i) {
                DRM_DEBUG_DRIVER("i = %d pixel_freq = %d alt = %d\n",
                                 i, params[i].pixel_freq,
                                 FREQ_1000_1001(params[i].pixel_freq));
+               DRM_DEBUG_DRIVER("i = %d phy_freq = %d alt = %d\n",
+                                i, params[i].phy_freq,
+                                FREQ_1000_1001(params[i].phy_freq/10)*10);
                /* Match strict frequency */
-               if (freq == params[i].pixel_freq)
+               if (phy_freq == params[i].phy_freq &&
+                   vclk_freq == params[i].vclk_freq)
                        return MODE_OK;
                /* Match 1000/1001 variant */
-               if (freq == FREQ_1000_1001(params[i].pixel_freq))
+               if (phy_freq == (FREQ_1000_1001(params[i].phy_freq/10)*10) &&
+                   vclk_freq == FREQ_1000_1001(params[i].vclk_freq))
                        return MODE_OK;
        }
 
@@ -965,8 +1011,9 @@ static void meson_vclk_set(struct meson_drm *priv, unsigned int pll_base_freq,
 }
 
 void meson_vclk_setup(struct meson_drm *priv, unsigned int target,
-                     unsigned int vclk_freq, unsigned int venc_freq,
-                     unsigned int dac_freq, bool hdmi_use_enci)
+                     unsigned int phy_freq, unsigned int vclk_freq,
+                     unsigned int venc_freq, unsigned int dac_freq,
+                     bool hdmi_use_enci)
 {
        bool vic_alternate_clock = false;
        unsigned int freq;
@@ -986,7 +1033,7 @@ void meson_vclk_setup(struct meson_drm *priv, unsigned int target,
                 * - venc_div = 1
                 * - encp encoder
                 */
-               meson_vclk_set(priv, vclk_freq * 10, 0, 0, 0,
+               meson_vclk_set(priv, phy_freq, 0, 0, 0,
                               VID_PLL_DIV_5, 2, 1, 1, false, false);
                return;
        }
@@ -1008,9 +1055,11 @@ void meson_vclk_setup(struct meson_drm *priv, unsigned int target,
        }
 
        for (freq = 0 ; params[freq].pixel_freq ; ++freq) {
-               if (vclk_freq == params[freq].pixel_freq ||
-                   vclk_freq == FREQ_1000_1001(params[freq].pixel_freq)) {
-                       if (vclk_freq != params[freq].pixel_freq)
+               if ((phy_freq == params[freq].phy_freq ||
+                    phy_freq == FREQ_1000_1001(params[freq].phy_freq/10)*10) &&
+                   (vclk_freq == params[freq].vclk_freq ||
+                    vclk_freq == FREQ_1000_1001(params[freq].vclk_freq))) {
+                       if (vclk_freq != params[freq].vclk_freq)
                                vic_alternate_clock = true;
                        else
                                vic_alternate_clock = false;
@@ -1039,7 +1088,7 @@ void meson_vclk_setup(struct meson_drm *priv, unsigned int target,
                return;
        }
 
-       meson_vclk_set(priv, params[freq].pll_base_freq,
+       meson_vclk_set(priv, params[freq].pll_freq,
                       params[freq].pll_od1, params[freq].pll_od2,
                       params[freq].pll_od3, params[freq].vid_pll_div,
                       params[freq].vclk_div, hdmi_tx_div, venc_div,

diff --git a/drivers/gpu/drm/meson/meson_vclk.h b/drivers/gpu/drm/meson/meson_vclk.h
index b62125540aeffa300c0ce338c2075db6fe12d836..aed0ab2efa71dbf349cc1c365c27542666ecb754 100644 (file)
--- a/drivers/gpu/drm/meson/meson_vclk.h
+++ b/drivers/gpu/drm/meson/meson_vclk.h
@@ -25,10 +25,11 @@ enum {
 enum drm_mode_status
 meson_vclk_dmt_supported_freq(struct meson_drm *priv, unsigned int freq);
 enum drm_mode_status
-meson_vclk_vic_supported_freq(unsigned int freq);
+meson_vclk_vic_supported_freq(unsigned int phy_freq, unsigned int vclk_freq);
 
 void meson_vclk_setup(struct meson_drm *priv, unsigned int target,
-                     unsigned int vclk_freq, unsigned int venc_freq,
-                     unsigned int dac_freq, bool hdmi_use_enci);
+                     unsigned int phy_freq, unsigned int vclk_freq,
+                     unsigned int venc_freq, unsigned int dac_freq,
+                     bool hdmi_use_enci);
 
 #endif /* __MESON_VCLK_H */

diff --git a/drivers/gpu/drm/meson/meson_venc_cvbs.c b/drivers/gpu/drm/meson/meson_venc_cvbs.c
index 1bd6b6d15ffb304d38c9cb3bfb718e2964e7a75f..541f9eb2a1352180a9709eddcddb240b84588225 100644 (file)
--- a/drivers/gpu/drm/meson/meson_venc_cvbs.c
+++ b/drivers/gpu/drm/meson/meson_venc_cvbs.c
@@ -213,8 +213,10 @@ static void meson_venc_cvbs_encoder_mode_set(struct drm_encoder *encoder,
                meson_venci_cvbs_mode_set(priv, meson_mode->enci);
 
                /* Setup 27MHz vclk2 for ENCI and VDAC */
-               meson_vclk_setup(priv, MESON_VCLK_TARGET_CVBS, MESON_VCLK_CVBS,
-                                MESON_VCLK_CVBS, MESON_VCLK_CVBS, true);
+               meson_vclk_setup(priv, MESON_VCLK_TARGET_CVBS,
+                                MESON_VCLK_CVBS, MESON_VCLK_CVBS,
+                                MESON_VCLK_CVBS, MESON_VCLK_CVBS,
+                                true);
        }
 }