Merge tag 'drm-misc-next-2024-02-29' of https://anongit.freedesktop.org/git/drm/drm-misc into drm-next

drm-misc-next for v6.9:

UAPI Changes:

Cross-subsystem Changes:

backlight:
- corgi: include backlight header

fbdev:
- Cleanup includes in public header file
- fbtft: Include backlight header

Core Changes:

edid:
- Remove built-in EDID data

dp:
- Avoid AUX transfers on powered-down displays
- Add VSC SDP helpers

modesetting:
- Add sanity checks for polling
- Cleanups

scheduler:
- Cleanups

tests:
- Add helpers for mode-setting tests

Driver Changes:

i915:
- Use shared VSC SDP helper

mgag200:
- Work around PCI write bursts

mxsfb:
- Use managed mode config

nouveau:
- Include backlight header where necessary

qiac:
- Cleanups

sun4:
- HDMI: updates to atomic mode setting

tegra:
- Fix GEM refounting in error paths

tidss:
- Fix multi display
- Fix initial Z position

v3d:
- Support display MMU page size

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240229084806.GA21616@localhost.localdomain

1 files changed, 132 insertions, 0 deletions

diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
index d046dfa79504..266826eac4a7 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -533,6 +533,15 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
 	mutex_lock(&aux->hw_mutex);
 
 	/*
+	 * If the device attached to the aux bus is powered down then there's
+	 * no reason to attempt a transfer. Error out immediately.
+	 */
+	if (aux->powered_down) {
+		ret = -EBUSY;
+		goto unlock;
+	}
+
+	/*
 	 * The specification doesn't give any recommendation on how often to
 	 * retry native transactions. We used to retry 7 times like for
 	 * aux i2c transactions but real world devices this wasn't
@@ -600,6 +609,29 @@ int drm_dp_dpcd_probe(struct drm_dp_aux *aux, unsigned int offset)
 EXPORT_SYMBOL(drm_dp_dpcd_probe);
 
 /**
+ * drm_dp_dpcd_set_powered() - Set whether the DP device is powered
+ * @aux: DisplayPort AUX channel; for convenience it's OK to pass NULL here
+ *       and the function will be a no-op.
+ * @powered: true if powered; false if not
+ *
+ * If the endpoint device on the DP AUX bus is known to be powered down
+ * then this function can be called to make future transfers fail immediately
+ * instead of needing to time out.
+ *
+ * If this function is never called then a device defaults to being powered.
+ */
+void drm_dp_dpcd_set_powered(struct drm_dp_aux *aux, bool powered)
+{
+	if (!aux)
+		return;
+
+	mutex_lock(&aux->hw_mutex);
+	aux->powered_down = !powered;
+	mutex_unlock(&aux->hw_mutex);
+}
+EXPORT_SYMBOL(drm_dp_dpcd_set_powered);
+
+/**
  * drm_dp_dpcd_read() - read a series of bytes from the DPCD
  * @aux: DisplayPort AUX channel (SST or MST)
  * @offset: address of the (first) register to read
@@ -1858,6 +1890,9 @@ static int drm_dp_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
 	struct drm_dp_aux_msg msg;
 	int err = 0;
 
+	if (aux->powered_down)
+		return -EBUSY;
+
 	dp_aux_i2c_transfer_size = clamp(dp_aux_i2c_transfer_size, 1, DP_AUX_MAX_PAYLOAD_BYTES);
 
 	memset(&msg, 0, sizeof(msg));
@@ -2914,6 +2949,103 @@ void drm_dp_vsc_sdp_log(struct drm_printer *p, const struct drm_dp_vsc_sdp *vsc)
 EXPORT_SYMBOL(drm_dp_vsc_sdp_log);
 
 /**
+ * drm_dp_vsc_sdp_supported() - check if vsc sdp is supported
+ * @aux: DisplayPort AUX channel
+ * @dpcd: DisplayPort configuration data
+ *
+ * Returns true if vsc sdp is supported, else returns false
+ */
+bool drm_dp_vsc_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+	u8 rx_feature;
+
+	if (dpcd[DP_DPCD_REV] < DP_DPCD_REV_13)
+		return false;
+
+	if (drm_dp_dpcd_readb(aux, DP_DPRX_FEATURE_ENUMERATION_LIST, &rx_feature) != 1) {
+		drm_dbg_dp(aux->drm_dev, "failed to read DP_DPRX_FEATURE_ENUMERATION_LIST\n");
+		return false;
+	}
+
+	return (rx_feature & DP_VSC_SDP_EXT_FOR_COLORIMETRY_SUPPORTED);
+}
+EXPORT_SYMBOL(drm_dp_vsc_sdp_supported);
+
+/**
+ * drm_dp_vsc_sdp_pack() - pack a given vsc sdp into generic dp_sdp
+ * @vsc: vsc sdp initialized according to its purpose as defined in
+ *       table 2-118 - table 2-120 in DP 1.4a specification
+ * @sdp: valid handle to the generic dp_sdp which will be packed
+ *
+ * Returns length of sdp on success and error code on failure
+ */
+ssize_t drm_dp_vsc_sdp_pack(const struct drm_dp_vsc_sdp *vsc,
+			    struct dp_sdp *sdp)
+{
+	size_t length = sizeof(struct dp_sdp);
+
+	memset(sdp, 0, sizeof(struct dp_sdp));
+
+	/*
+	 * Prepare VSC Header for SU as per DP 1.4a spec, Table 2-119
+	 * VSC SDP Header Bytes
+	 */
+	sdp->sdp_header.HB0 = 0; /* Secondary-Data Packet ID = 0 */
+	sdp->sdp_header.HB1 = vsc->sdp_type; /* Secondary-data Packet Type */
+	sdp->sdp_header.HB2 = vsc->revision; /* Revision Number */
+	sdp->sdp_header.HB3 = vsc->length; /* Number of Valid Data Bytes */
+
+	if (vsc->revision == 0x6) {
+		sdp->db[0] = 1;
+		sdp->db[3] = 1;
+	}
+
+	/*
+	 * Revision 0x5 and revision 0x7 supports Pixel Encoding/Colorimetry
+	 * Format as per DP 1.4a spec and DP 2.0 respectively.
+	 */
+	if (!(vsc->revision == 0x5 || vsc->revision == 0x7))
+		goto out;
+
+	/* VSC SDP Payload for DB16 through DB18 */
+	/* Pixel Encoding and Colorimetry Formats  */
+	sdp->db[16] = (vsc->pixelformat & 0xf) << 4; /* DB16[7:4] */
+	sdp->db[16] |= vsc->colorimetry & 0xf; /* DB16[3:0] */
+
+	switch (vsc->bpc) {
+	case 6:
+		/* 6bpc: 0x0 */
+		break;
+	case 8:
+		sdp->db[17] = 0x1; /* DB17[3:0] */
+		break;
+	case 10:
+		sdp->db[17] = 0x2;
+		break;
+	case 12:
+		sdp->db[17] = 0x3;
+		break;
+	case 16:
+		sdp->db[17] = 0x4;
+		break;
+	default:
+		WARN(1, "Missing case %d\n", vsc->bpc);
+		return -EINVAL;
+	}
+
+	/* Dynamic Range and Component Bit Depth */
+	if (vsc->dynamic_range == DP_DYNAMIC_RANGE_CTA)
+		sdp->db[17] |= 0x80;  /* DB17[7] */
+
+	/* Content Type */
+	sdp->db[18] = vsc->content_type & 0x7;
+
+out:
+	return length;
+}
+EXPORT_SYMBOL(drm_dp_vsc_sdp_pack);
+
+/**
  * drm_dp_get_pcon_max_frl_bw() - maximum frl supported by PCON
  * @dpcd: DisplayPort configuration data
  * @port_cap: port capabilities