drm/vc4: hdmi: Support BCM2711 CEC interrupt setup

The HDMI controller found in the BCM2711 has an external interrupt
controller for the CEC and hotplug interrupt shared between the two
instances.

Let's add a variant flag to register a single interrupt handler and
deals with the interrupt handler setup, or two interrupt handlers
relying on an external irqchip.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Link: https://patchwork.freedesktop.org/patch/msgid/20210111142309.193441-11-maxime@cerno.tech
(cherry picked from commit ad6380e9aaf459c22006c73fd3d4dd6f41e8f048)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 68c3027..165405e 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1606,9 +1606,11 @@ static int vc4_hdmi_cec_adap_enable(struct cec_adapter *adap, bool enable)
                           ((3600 / usecs) << VC4_HDMI_CEC_CNT_TO_3600_US_SHIFT) |
                           ((3500 / usecs) << VC4_HDMI_CEC_CNT_TO_3500_US_SHIFT));
 
-               HDMI_WRITE(HDMI_CEC_CPU_MASK_CLEAR, VC4_HDMI_CPU_CEC);
+               if (!vc4_hdmi->variant->external_irq_controller)
+                       HDMI_WRITE(HDMI_CEC_CPU_MASK_CLEAR, VC4_HDMI_CPU_CEC);
        } else {
-               HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, VC4_HDMI_CPU_CEC);
+               if (!vc4_hdmi->variant->external_irq_controller)
+                       HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, VC4_HDMI_CPU_CEC);
                HDMI_WRITE(HDMI_CEC_CNTRL_5, val |
                           VC4_HDMI_CEC_TX_SW_RESET | VC4_HDMI_CEC_RX_SW_RESET);
        }
@@ -1683,8 +1685,6 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi)
        cec_fill_conn_info_from_drm(&conn_info, &vc4_hdmi->connector);
        cec_s_conn_info(vc4_hdmi->cec_adap, &conn_info);
 
-       HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, 0xffffffff);
-
        value = HDMI_READ(HDMI_CEC_CNTRL_1);
        /* Set the logical address to Unregistered */
        value |= VC4_HDMI_CEC_ADDR_MASK;
@@ -1692,12 +1692,32 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi)
 
        vc4_hdmi_cec_update_clk_div(vc4_hdmi);
 
-       ret = devm_request_threaded_irq(&pdev->dev, platform_get_irq(pdev, 0),
-                                       vc4_cec_irq_handler,
-                                       vc4_cec_irq_handler_thread, 0,
-                                       "vc4 hdmi cec", vc4_hdmi);
-       if (ret)
-               goto err_delete_cec_adap;
+       if (vc4_hdmi->variant->external_irq_controller) {
+               ret = devm_request_threaded_irq(&pdev->dev,
+                                               platform_get_irq_byname(pdev, "cec-rx"),
+                                               vc4_cec_irq_handler_rx_bare,
+                                               vc4_cec_irq_handler_rx_thread, 0,
+                                               "vc4 hdmi cec rx", vc4_hdmi);
+               if (ret)
+                       goto err_delete_cec_adap;
+
+               ret = devm_request_threaded_irq(&pdev->dev,
+                                               platform_get_irq_byname(pdev, "cec-tx"),
+                                               vc4_cec_irq_handler_tx_bare,
+                                               vc4_cec_irq_handler_tx_thread, 0,
+                                               "vc4 hdmi cec tx", vc4_hdmi);
+               if (ret)
+                       goto err_delete_cec_adap;
+       } else {
+               HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, 0xffffffff);
+
+               ret = devm_request_threaded_irq(&pdev->dev, platform_get_irq(pdev, 0),
+                                               vc4_cec_irq_handler,
+                                               vc4_cec_irq_handler_thread, 0,
+                                               "vc4 hdmi cec", vc4_hdmi);
+               if (ret)
+                       goto err_delete_cec_adap;
+       }
 
        ret = cec_register_adapter(vc4_hdmi->cec_adap, &pdev->dev);
        if (ret < 0)
@@ -2096,6 +2116,7 @@ static const struct vc4_hdmi_variant bcm2711_hdmi0_variant = {
                PHY_LANE_CK,
        },
        .unsupported_odd_h_timings      = true,
+       .external_irq_controller        = true,
 
        .init_resources         = vc5_hdmi_init_resources,
        .csc_setup              = vc5_hdmi_csc_setup,
@@ -2122,6 +2143,7 @@ static const struct vc4_hdmi_variant bcm2711_hdmi1_variant = {
                PHY_LANE_2,
        },
        .unsupported_odd_h_timings      = true,
+       .external_irq_controller        = true,
 
        .init_resources         = vc5_hdmi_init_resources,
        .csc_setup              = vc5_hdmi_csc_setup,

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
index 6966db1..d71f6ed 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -64,6 +64,13 @@ struct vc4_hdmi_variant {
        /* The BCM2711 cannot deal with odd horizontal pixel timings */
        bool unsupported_odd_h_timings;
 
+       /*
+        * The BCM2711 CEC/hotplug IRQ controller is shared between the
+        * two HDMI controllers, and we have a proper irqchip driver for
+        * it.
+        */
+       bool external_irq_controller;
+
        /* Callback to get the resources (memory region, interrupts,
         * clocks, etc) for that variant.
         */