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SubjectRe: [PATCH 1/4] drm/bridge: dw-hdmi: Add Dynamic Range and Mastering InfoFrame support
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On 26.05.2019 23:19, Jonas Karlman wrote:
> Add support for configuring Dynamic Range and Mastering InfoFrame from
> the hdr_output_metadata connector property.
>
> This patch adds a drm_infoframe flag to dw_hdmi_plat_data that platform drivers
> use to signal when Dynamic Range and Mastering infoframes is supported.
> This flag is needed because Amlogic GXBB and GXL report same DW-HDMI version,
> and only GXL support DRM InfoFrame.
>
> These changes were based on work done by Zheng Yang <zhengyang@rock-chips.com>
> to support DRM InfoFrame on the Rockchip 4.4 BSP kernel at [1] and [2]
>
> [1] https://github.com/rockchip-linux/kernel/tree/develop-4.4
> [2] https://github.com/rockchip-linux/kernel/commit/d1943fde81ff41d7cca87f4a42f03992e90bddd5
>
> Cc: Zheng Yang <zhengyang@rock-chips.com>
> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
> ---
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 109 ++++++++++++++++++++++
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.h | 37 ++++++++
> include/drm/bridge/dw_hdmi.h | 1 +
> 3 files changed, 147 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 284ce59be8f8..801bbbd732fd 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -24,6 +24,7 @@
>
> #include <drm/drm_of.h>
> #include <drm/drmP.h>
> +#include <drm/drm_atomic.h>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_edid.h>
> #include <drm/drm_encoder_slave.h>
> @@ -1592,6 +1593,78 @@ static void hdmi_config_vendor_specific_infoframe(struct dw_hdmi *hdmi,
> HDMI_FC_DATAUTO0_VSD_MASK);
> }
>
> +#define HDR_LSB(n) ((n) & 0xff)
> +#define HDR_MSB(n) (((n) & 0xff00) >> 8)
> +
> +static void hdmi_config_drm_infoframe(struct dw_hdmi *hdmi)
> +{
> + const struct drm_connector_state *conn_state = hdmi->connector.state;
> + struct hdmi_drm_infoframe frame;
> + int ret;
> +
> + if (hdmi->version < 0x200a || !hdmi->plat_data->drm_infoframe)


Why do we need this double check? Here and in dw_hdmi_bridge_attach.

Wouldn't be enough to test drm_infoframe?


> + return;
> +
> + hdmi_modb(hdmi, HDMI_FC_PACKET_TX_EN_DRM_DISABLE,
> + HDMI_FC_PACKET_TX_EN_DRM_MASK, HDMI_FC_PACKET_TX_EN);
> +
> + ret = drm_hdmi_infoframe_set_hdr_metadata(&frame, conn_state);
> + if (ret < 0)
> + return;
> +
> + ret = hdmi_drm_infoframe_check(&frame);
> + if (WARN_ON(ret))
> + return;
> +
> + hdmi_writeb(hdmi, frame.version, HDMI_FC_DRM_HB0);
> + hdmi_writeb(hdmi, frame.length, HDMI_FC_DRM_HB1);
> + hdmi_writeb(hdmi, frame.eotf, HDMI_FC_DRM_PB0);
> + hdmi_writeb(hdmi, frame.metadata_type, HDMI_FC_DRM_PB1);
> + hdmi_writeb(hdmi, HDR_LSB(frame.display_primaries[0].x),
> + HDMI_FC_DRM_PB2);
> + hdmi_writeb(hdmi, HDR_MSB(frame.display_primaries[0].x),
> + HDMI_FC_DRM_PB3);


Adding two-byte version hdmi_writew would allow to remove multiple lines
here, but since register names and their relative location reflects
structure of raw frame you should be able to replace this
long/boring/error-prone sequence of writes with something like:

len = hdmi_infoframe_pack(frame, buf, len);

if (len < 0)

    ...

for (i = 0; i < len; ++i)

    hdmi_writeb(hdmi, buf[i], HDMI_FC_DRM_HB0 + i);


... or something similar.


> + hdmi_writeb(hdmi, HDR_LSB(frame.display_primaries[0].y),
> + HDMI_FC_DRM_PB4);
> + hdmi_writeb(hdmi, HDR_MSB(frame.display_primaries[0].y),
> + HDMI_FC_DRM_PB5);
> + hdmi_writeb(hdmi, HDR_LSB(frame.display_primaries[1].x),
> + HDMI_FC_DRM_PB6);
> + hdmi_writeb(hdmi, HDR_MSB(frame.display_primaries[1].x),
> + HDMI_FC_DRM_PB7);
> + hdmi_writeb(hdmi, HDR_LSB(frame.display_primaries[1].y),
> + HDMI_FC_DRM_PB8);
> + hdmi_writeb(hdmi, HDR_MSB(frame.display_primaries[1].y),
> + HDMI_FC_DRM_PB9);
> + hdmi_writeb(hdmi, HDR_LSB(frame.display_primaries[2].x),
> + HDMI_FC_DRM_PB10);
> + hdmi_writeb(hdmi, HDR_MSB(frame.display_primaries[2].x),
> + HDMI_FC_DRM_PB11);
> + hdmi_writeb(hdmi, HDR_LSB(frame.display_primaries[2].y),
> + HDMI_FC_DRM_PB12);
> + hdmi_writeb(hdmi, HDR_MSB(frame.display_primaries[2].y),
> + HDMI_FC_DRM_PB13);
> + hdmi_writeb(hdmi, HDR_LSB(frame.white_point.x), HDMI_FC_DRM_PB14);
> + hdmi_writeb(hdmi, HDR_MSB(frame.white_point.x), HDMI_FC_DRM_PB15);
> + hdmi_writeb(hdmi, HDR_LSB(frame.white_point.y), HDMI_FC_DRM_PB16);
> + hdmi_writeb(hdmi, HDR_MSB(frame.white_point.y), HDMI_FC_DRM_PB17);
> + hdmi_writeb(hdmi, HDR_LSB(frame.max_display_mastering_luminance),
> + HDMI_FC_DRM_PB18);
> + hdmi_writeb(hdmi, HDR_MSB(frame.max_display_mastering_luminance),
> + HDMI_FC_DRM_PB19);
> + hdmi_writeb(hdmi, HDR_LSB(frame.min_display_mastering_luminance),
> + HDMI_FC_DRM_PB20);
> + hdmi_writeb(hdmi, HDR_MSB(frame.min_display_mastering_luminance),
> + HDMI_FC_DRM_PB21);
> + hdmi_writeb(hdmi, HDR_LSB(frame.max_cll), HDMI_FC_DRM_PB22);
> + hdmi_writeb(hdmi, HDR_MSB(frame.max_cll), HDMI_FC_DRM_PB23);
> + hdmi_writeb(hdmi, HDR_LSB(frame.max_fall), HDMI_FC_DRM_PB24);
> + hdmi_writeb(hdmi, HDR_MSB(frame.max_fall), HDMI_FC_DRM_PB25);
> + hdmi_writeb(hdmi, 1, HDMI_FC_DRM_UP);
> + hdmi_modb(hdmi, HDMI_FC_PACKET_TX_EN_DRM_ENABLE,
> + HDMI_FC_PACKET_TX_EN_DRM_MASK, HDMI_FC_PACKET_TX_EN);
> +}
> +
> static void hdmi_av_composer(struct dw_hdmi *hdmi,
> const struct drm_display_mode *mode)
> {
> @@ -1963,6 +2036,7 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
> /* HDMI Initialization Step F - Configure AVI InfoFrame */
> hdmi_config_AVI(hdmi, mode);
> hdmi_config_vendor_specific_infoframe(hdmi, mode);
> + hdmi_config_drm_infoframe(hdmi);
> } else {
> dev_dbg(hdmi->dev, "%s DVI mode\n", __func__);
> }
> @@ -2139,6 +2213,36 @@ static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
> return ret;
> }
>
> +static bool blob_equal(const struct drm_property_blob *a,
> + const struct drm_property_blob *b)


Quite generic function, but since there are no other users(?) it can
stay here.


> +{
> + if (a && b)
> + return a->length == b->length &&
> + !memcmp(a->data, b->data, a->length);
> +
> + return !a == !b;


Ugly code (but it is probably matter of taste), maybe sth like this:
    if (!a || !b)
        return a != b;

    if (a->length != b->length)
        return false;

    return !memcmp(a->data, b->data, a->length);


> +}
> +
> +static int dw_hdmi_connector_atomic_check(struct drm_connector *conn,
> + struct drm_connector_state *new_state)
> +{
> + struct drm_connector_state *old_state =
> + drm_atomic_get_old_connector_state(new_state->state, conn);
> + struct drm_crtc_state *crtc_state;
> +
> + if (!new_state->crtc)
> + return 0;
> +
> + crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
> + new_state->crtc);
> +
> + if (!blob_equal(new_state->hdr_output_metadata,
> + old_state->hdr_output_metadata))
> + crtc_state->mode_changed = true;
> +
> + return 0;
> +}
> +
> static void dw_hdmi_connector_force(struct drm_connector *connector)
> {
> struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
> @@ -2163,6 +2267,7 @@ static const struct drm_connector_funcs dw_hdmi_connector_funcs = {
>
> static const struct drm_connector_helper_funcs dw_hdmi_connector_helper_funcs = {
> .get_modes = dw_hdmi_connector_get_modes,
> + .atomic_check = dw_hdmi_connector_atomic_check,
> };
>
> static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
> @@ -2179,6 +2284,10 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
> drm_connector_init(bridge->dev, connector, &dw_hdmi_connector_funcs,
> DRM_MODE_CONNECTOR_HDMIA);
>
> + if (hdmi->version >= 0x200a && hdmi->plat_data->drm_infoframe)
> + drm_object_attach_property(&connector->base,
> + connector->dev->mode_config.hdr_output_metadata_property, 0);
> +
> drm_connector_attach_encoder(connector, encoder);
>
> return 0;
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> index 3f3c616eba97..d4efbec14f68 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> @@ -256,6 +256,7 @@
> #define HDMI_FC_POL2 0x10DB
> #define HDMI_FC_PRCONF 0x10E0
> #define HDMI_FC_SCRAMBLER_CTRL 0x10E1
> +#define HDMI_FC_PACKET_TX_EN 0x10E3
>
> #define HDMI_FC_GMD_STAT 0x1100
> #define HDMI_FC_GMD_EN 0x1101
> @@ -291,6 +292,37 @@
> #define HDMI_FC_GMD_PB26 0x111F
> #define HDMI_FC_GMD_PB27 0x1120
>
> +#define HDMI_FC_DRM_UP 0x1167
> +#define HDMI_FC_DRM_HB0 0x1168
> +#define HDMI_FC_DRM_HB1 0x1169
> +#define HDMI_FC_DRM_PB0 0x116A
> +#define HDMI_FC_DRM_PB1 0x116B
> +#define HDMI_FC_DRM_PB2 0x116C
> +#define HDMI_FC_DRM_PB3 0x116D
> +#define HDMI_FC_DRM_PB4 0x116E
> +#define HDMI_FC_DRM_PB5 0x116F
> +#define HDMI_FC_DRM_PB6 0x1170
> +#define HDMI_FC_DRM_PB7 0x1171
> +#define HDMI_FC_DRM_PB8 0x1172
> +#define HDMI_FC_DRM_PB9 0x1173
> +#define HDMI_FC_DRM_PB10 0x1174
> +#define HDMI_FC_DRM_PB11 0x1175
> +#define HDMI_FC_DRM_PB12 0x1176
> +#define HDMI_FC_DRM_PB13 0x1177
> +#define HDMI_FC_DRM_PB14 0x1178
> +#define HDMI_FC_DRM_PB15 0x1179
> +#define HDMI_FC_DRM_PB16 0x117A
> +#define HDMI_FC_DRM_PB17 0x117B
> +#define HDMI_FC_DRM_PB18 0x117C
> +#define HDMI_FC_DRM_PB19 0x117D
> +#define HDMI_FC_DRM_PB20 0x117E
> +#define HDMI_FC_DRM_PB21 0x117F
> +#define HDMI_FC_DRM_PB22 0x1180
> +#define HDMI_FC_DRM_PB23 0x1181
> +#define HDMI_FC_DRM_PB24 0x1182
> +#define HDMI_FC_DRM_PB25 0x1183
> +#define HDMI_FC_DRM_PB26 0x1184
> +
> #define HDMI_FC_DBGFORCE 0x1200
> #define HDMI_FC_DBGAUD0CH0 0x1201
> #define HDMI_FC_DBGAUD1CH0 0x1202
> @@ -746,6 +778,11 @@ enum {
> HDMI_FC_PRCONF_OUTPUT_PR_FACTOR_MASK = 0x0F,
> HDMI_FC_PRCONF_OUTPUT_PR_FACTOR_OFFSET = 0,
>
> +/* FC_PACKET_TX_EN field values */
> + HDMI_FC_PACKET_TX_EN_DRM_MASK = 0x80,
> + HDMI_FC_PACKET_TX_EN_DRM_ENABLE = 0x80,
> + HDMI_FC_PACKET_TX_EN_DRM_DISABLE = 0x00,
> +
> /* FC_AVICONF0-FC_AVICONF3 field values */
> HDMI_FC_AVICONF0_PIX_FMT_MASK = 0x03,
> HDMI_FC_AVICONF0_PIX_FMT_RGB = 0x00,
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index 0f0e82638fbe..04d1ec60f218 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -131,6 +131,7 @@ struct dw_hdmi_plat_data {
> unsigned long input_bus_format;
> unsigned long input_bus_encoding;
> bool ycbcr_420_allowed;
> + bool drm_infoframe;


maybe sth less confusing, for example: use_drm_infoframe?


Regards

Andrzej



>
> /* Vendor PHY support */
> const struct dw_hdmi_phy_ops *phy_ops;


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