drm/ast: Create the driver for ASPEED proprietory Display-Port

V1:
1. The MCU FW controling ASPEED DP is loaded by BMC boot loader.
2. Driver starts after CR[3:1] == 111b that indicates Tx is ASTDP,
   and CRD1[5] has been asserted by BMVC boot loader.
3. EDID is prioritized by DP monitor.
4. DP's EDID has high priority to decide resolution supporting.

V2:
Modules description:
1. ASTDP (ASPEED DisplayPort) is controlled by dedicated
   AST-MCU (ASPEED propriatary MCU).
2. MCU is looping in charged of HPD, Read EDID, Link Training with
   DP sink.
3. ASTDP and AST-MUC reside in BMC (Baseboard Management controller)
   addressing-space.
4. ASPEED DRM driver requests MCU to get HPD and EDID by CR-scratched
   register.

Booting sequence:
1. Check if TX is ASTDP					// ast_dp_launch()
2. Check if DP-MCU FW has loaded					// ast_dp_launch()
3. Read EDID					// ast_dp_read_edid()
4. Resolution switch					// ast_dp_SetOutput()

V3:
1. Remove unneeded semicolon.
2. Apply to git://anongit.freedesktop.org/drm/drm, instead of
   git://anongit.freedesktop.org/drm/drm-misc
3. Resolve auto build test WARNINGs on V1 patch.

V4:
1. Sync code-base with kernel 5.17_rc6
2. Remove the define of DPControlPower, because DP chips need to be
   powered on to be used.
3. Remove the switches of PHY and Display from EDID procedure.
4. Revise increaing delay to fixed delay, because this version kernel
   doesn't detect minitor consistenntly.
5. Create clean-up code used for reset of power state on errors with
   -EIO manner.
6. Revise the DP detection by TX type and its DP-FW status during
   booting and resume.
7. Correct the CamelCase Style.
8. Use register reading while needing, and remove to hold full
   register.
9. Instead of 'u8', revise to 'bool' on swwitch of PHY and video.
10.Correct typo
11.Remove the duplicated copy of TX definition.
12.Use EDID_LENGTH as the constant of 128.

Signed-off-by: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220428075603.20904-1-kuohsiang_chou@aspeedtech.com

1 files changed, 120 insertions, 4 deletions

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 45b56b39ad47..4728825b7b67 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -988,21 +988,41 @@ err_drm_gem_vram_put:
 static void ast_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
 	struct ast_private *ast = to_ast_private(crtc->dev);
+	u8 ch = AST_DPMS_VSYNC_OFF | AST_DPMS_HSYNC_OFF;
 
 	/* TODO: Maybe control display signal generation with
 	 *       Sync Enable (bit CR17.7).
 	 */
 	switch (mode) {
 	case DRM_MODE_DPMS_ON:
-	case DRM_MODE_DPMS_STANDBY:
-	case DRM_MODE_DPMS_SUSPEND:
+		ast_set_index_reg_mask(ast, AST_IO_SEQ_PORT,  0x01, 0xdf, 0);
+		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xfc, 0);
 		if (ast->tx_chip_type == AST_TX_DP501)
 			ast_set_dp501_video_output(crtc->dev, 1);
+
+		if (ast->tx_chip_type == AST_TX_ASTDP) {
+			ast_dp_power_on_off(crtc->dev, AST_DP_POWER_ON);
+			ast_wait_for_vretrace(ast);
+			ast_dp_set_on_off(crtc->dev, 1);
+		}
+
+		ast_crtc_load_lut(ast, crtc);
 		break;
+	case DRM_MODE_DPMS_STANDBY:
+	case DRM_MODE_DPMS_SUSPEND:
 	case DRM_MODE_DPMS_OFF:
+		ch = mode;
 		if (ast->tx_chip_type == AST_TX_DP501)
 			ast_set_dp501_video_output(crtc->dev, 0);
 		break;
+
+		if (ast->tx_chip_type == AST_TX_ASTDP) {
+			ast_dp_set_on_off(crtc->dev, 0);
+			ast_dp_power_on_off(crtc->dev, AST_DP_POWER_OFF);
+		}
+
+		ast_set_index_reg_mask(ast, AST_IO_SEQ_PORT,  0x01, 0xdf, 0x20);
+		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xfc, ch);
 	}
 }
 
@@ -1027,7 +1047,7 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
 
 		if ((ast->chip == AST2100) || (ast->chip == AST2200) ||
 		    (ast->chip == AST2300) || (ast->chip == AST2400) ||
-		    (ast->chip == AST2500)) {
+		    (ast->chip == AST2500) || (ast->chip == AST2600)) {
 			if ((mode->hdisplay == 1920) && (mode->vdisplay == 1080))
 				return MODE_OK;
 
@@ -1110,6 +1130,7 @@ ast_crtc_helper_atomic_flush(struct drm_crtc *crtc,
 	struct ast_private *ast = to_ast_private(crtc->dev);
 	struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc_state);
 	struct ast_crtc_state *old_ast_crtc_state = to_ast_crtc_state(old_crtc_state);
+	struct ast_vbios_mode_info *vbios_mode_info = &ast_crtc_state->vbios_mode_info;
 
 	/*
 	 * The gamma LUT has to be reloaded after changing the primary
@@ -1117,6 +1138,10 @@ ast_crtc_helper_atomic_flush(struct drm_crtc *crtc,
 	 */
 	if (old_ast_crtc_state->format != ast_crtc_state->format)
 		ast_crtc_load_lut(ast, crtc);
+
+	//Set Aspeed Display-Port
+	if (ast->tx_chip_type == AST_TX_ASTDP)
+		ast_dp_set_mode(crtc, vbios_mode_info);
 }
 
 static void
@@ -1528,6 +1553,93 @@ static int ast_dp501_output_init(struct ast_private *ast)
 }
 
 /*
+ * ASPEED Display-Port Connector
+ */
+
+static int ast_astdp_connector_helper_get_modes(struct drm_connector *connector)
+{
+	void *edid;
+
+	int succ;
+	int count;
+
+	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
+	if (!edid)
+		goto err_drm_connector_update_edid_property;
+
+	succ = ast_astdp_read_edid(connector->dev, edid);
+	if (succ < 0)
+		goto err_kfree;
+
+	drm_connector_update_edid_property(connector, edid);
+	count = drm_add_edid_modes(connector, edid);
+	kfree(edid);
+
+	return count;
+
+err_kfree:
+	kfree(edid);
+err_drm_connector_update_edid_property:
+	drm_connector_update_edid_property(connector, NULL);
+	return 0;
+}
+
+static const struct drm_connector_helper_funcs ast_astdp_connector_helper_funcs = {
+	.get_modes = ast_astdp_connector_helper_get_modes,
+};
+
+static const struct drm_connector_funcs ast_astdp_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int ast_astdp_connector_init(struct drm_device *dev, struct drm_connector *connector)
+{
+	int ret;
+
+	ret = drm_connector_init(dev, connector, &ast_astdp_connector_funcs,
+				 DRM_MODE_CONNECTOR_DisplayPort);
+	if (ret)
+		return ret;
+
+	drm_connector_helper_add(connector, &ast_astdp_connector_helper_funcs);
+
+	connector->interlace_allowed = 0;
+	connector->doublescan_allowed = 0;
+
+	connector->polled = DRM_CONNECTOR_POLL_CONNECT;
+
+	return 0;
+}
+
+static int ast_astdp_output_init(struct ast_private *ast)
+{
+	struct drm_device *dev = &ast->base;
+	struct drm_crtc *crtc = &ast->crtc;
+	struct drm_encoder *encoder = &ast->output.astdp.encoder;
+	struct drm_connector *connector = &ast->output.astdp.connector;
+	int ret;
+
+	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	ret = ast_astdp_connector_init(dev, connector);
+	if (ret)
+		return ret;
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/*
  * Mode config
  */
 
@@ -1563,7 +1675,8 @@ int ast_mode_config_init(struct ast_private *ast)
 	    ast->chip == AST2200 ||
 	    ast->chip == AST2300 ||
 	    ast->chip == AST2400 ||
-	    ast->chip == AST2500) {
+	    ast->chip == AST2500 ||
+	    ast->chip == AST2600) {
 		dev->mode_config.max_width = 1920;
 		dev->mode_config.max_height = 2048;
 	} else {
@@ -1594,6 +1707,9 @@ int ast_mode_config_init(struct ast_private *ast)
 	case AST_TX_DP501:
 		ret = ast_dp501_output_init(ast);
 		break;
+	case AST_TX_ASTDP:
+		ret = ast_astdp_output_init(ast);
+		break;
 	}
 	if (ret)
 		return ret;