drm/radeon/kms: add hpd support for r5xx/rs600/rs690/rs740 asics

This just adds the functionality, it's not hooked up
yet.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 84b26376027d..6364ba1d4153 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -60,6 +60,107 @@ int rs600_mc_init(struct radeon_device *rdev)
                 return r;
         return 0;
 }
+
+/* hpd for digital panel detect/disconnect */
+bool rs600_hpd_sense(struct radeon_device *rdev, enum radeon_hpd_id hpd)
+{
+        u32 tmp;
+        bool connected = false;
+
+        switch (hpd) {
+        case RADEON_HPD_1:
+                tmp = RREG32(R_007D04_DC_HOT_PLUG_DETECT1_INT_STATUS);
+                if (G_007D04_DC_HOT_PLUG_DETECT1_SENSE(tmp))
+                        connected = true;
+                break;
+        case RADEON_HPD_2:
+                tmp = RREG32(R_007D14_DC_HOT_PLUG_DETECT2_INT_STATUS);
+                if (G_007D14_DC_HOT_PLUG_DETECT2_SENSE(tmp))
+                        connected = true;
+                break;
+        default:
+                break;
+        }
+        return connected;
+}
+
+void rs600_hpd_set_polarity(struct radeon_device *rdev,
+                            enum radeon_hpd_id hpd)
+{
+        u32 tmp;
+        bool connected = rs600_hpd_sense(rdev, hpd);
+
+        switch (hpd) {
+        case RADEON_HPD_1:
+                tmp = RREG32(R_007D08_DC_HOT_PLUG_DETECT1_INT_CONTROL);
+                if (connected)
+                        tmp &= ~S_007D08_DC_HOT_PLUG_DETECT1_INT_POLARITY(1);
+                else
+                        tmp |= S_007D08_DC_HOT_PLUG_DETECT1_INT_POLARITY(1);
+                WREG32(R_007D08_DC_HOT_PLUG_DETECT1_INT_CONTROL, tmp);
+                break;
+        case RADEON_HPD_2:
+                tmp = RREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL);
+                if (connected)
+                        tmp &= ~S_007D18_DC_HOT_PLUG_DETECT2_INT_POLARITY(1);
+                else
+                        tmp |= S_007D18_DC_HOT_PLUG_DETECT2_INT_POLARITY(1);
+                WREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL, tmp);
+                break;
+        default:
+                break;
+        }
+}
+
+void rs600_hpd_init(struct radeon_device *rdev)
+{
+        struct drm_device *dev = rdev->ddev;
+        struct drm_connector *connector;
+
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                struct radeon_connector *radeon_connector = to_radeon_connector(connector);
+                switch (radeon_connector->hpd.hpd) {
+                case RADEON_HPD_1:
+                        WREG32(R_007D00_DC_HOT_PLUG_DETECT1_CONTROL,
+                               S_007D00_DC_HOT_PLUG_DETECT1_EN(1));
+                        rdev->irq.hpd[0] = true;
+                        break;
+                case RADEON_HPD_2:
+                        WREG32(R_007D10_DC_HOT_PLUG_DETECT2_CONTROL,
+                               S_007D10_DC_HOT_PLUG_DETECT2_EN(1));
+                        rdev->irq.hpd[1] = true;
+                        break;
+                default:
+                        break;
+                }
+        }
+        rs600_irq_set(rdev);
+}
+
+void rs600_hpd_fini(struct radeon_device *rdev)
+{
+        struct drm_device *dev = rdev->ddev;
+        struct drm_connector *connector;
+
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                struct radeon_connector *radeon_connector = to_radeon_connector(connector);
+                switch (radeon_connector->hpd.hpd) {
+                case RADEON_HPD_1:
+                        WREG32(R_007D00_DC_HOT_PLUG_DETECT1_CONTROL,
+                               S_007D00_DC_HOT_PLUG_DETECT1_EN(0));
+                        rdev->irq.hpd[0] = false;
+                        break;
+                case RADEON_HPD_2:
+                        WREG32(R_007D10_DC_HOT_PLUG_DETECT2_CONTROL,
+                               S_007D10_DC_HOT_PLUG_DETECT2_EN(0));
+                        rdev->irq.hpd[1] = false;
+                        break;
+                default:
+                        break;
+                }
+        }
+}
+
 /*
  * GART.
  */
@@ -209,6 +310,10 @@ int rs600_irq_set(struct radeon_device *rdev)
 {
         uint32_t tmp = 0;
         uint32_t mode_int = 0;
+        u32 hpd1 = RREG32(R_007D08_DC_HOT_PLUG_DETECT1_INT_CONTROL) &
+                ~S_007D08_DC_HOT_PLUG_DETECT1_INT_EN(1);
+        u32 hpd2 = RREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL) &
+                ~S_007D18_DC_HOT_PLUG_DETECT2_INT_EN(1);
 
         if (rdev->irq.sw_int) {
                 tmp |= S_000040_SW_INT_EN(1);
@@ -219,8 +324,16 @@ int rs600_irq_set(struct radeon_device *rdev)
         if (rdev->irq.crtc_vblank_int[1]) {
                 mode_int |= S_006540_D2MODE_VBLANK_INT_MASK(1);
         }
+        if (rdev->irq.hpd[0]) {
+                hpd1 |= S_007D08_DC_HOT_PLUG_DETECT1_INT_EN(1);
+        }
+        if (rdev->irq.hpd[1]) {
+                hpd2 |= S_007D18_DC_HOT_PLUG_DETECT2_INT_EN(1);
+        }
         WREG32(R_000040_GEN_INT_CNTL, tmp);
         WREG32(R_006540_DxMODE_INT_MASK, mode_int);
+        WREG32(R_007D08_DC_HOT_PLUG_DETECT1_INT_CONTROL, hpd1);
+        WREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL, hpd2);
         return 0;
 }
 
@@ -228,6 +341,7 @@ static inline uint32_t rs600_irq_ack(struct radeon_device *rdev, u32 *r500_disp_
 {
         uint32_t irqs = RREG32(R_000044_GEN_INT_STATUS);
         uint32_t irq_mask = ~C_000044_SW_INT;
+        u32 tmp;
 
         if (G_000044_DISPLAY_INT_STAT(irqs)) {
                 *r500_disp_int = RREG32(R_007EDC_DISP_INTERRUPT_STATUS);
@@ -239,6 +353,16 @@ static inline uint32_t rs600_irq_ack(struct radeon_device *rdev, u32 *r500_disp_
                         WREG32(R_006D34_D2MODE_VBLANK_STATUS,
                                 S_006D34_D2MODE_VBLANK_ACK(1));
                 }
+                if (G_007EDC_DC_HOT_PLUG_DETECT1_INTERRUPT(*r500_disp_int)) {
+                        tmp = RREG32(R_007D08_DC_HOT_PLUG_DETECT1_INT_CONTROL);
+                        tmp |= S_007D08_DC_HOT_PLUG_DETECT1_INT_ACK(1);
+                        WREG32(R_007D08_DC_HOT_PLUG_DETECT1_INT_CONTROL, tmp);
+                }
+                if (G_007EDC_DC_HOT_PLUG_DETECT2_INTERRUPT(*r500_disp_int)) {
+                        tmp = RREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL);
+                        tmp |= S_007D18_DC_HOT_PLUG_DETECT2_INT_ACK(1);
+                        WREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL, tmp);
+                }
         } else {
                 *r500_disp_int = 0;
         }
@@ -278,6 +402,12 @@ int rs600_irq_process(struct radeon_device *rdev)
                         drm_handle_vblank(rdev->ddev, 0);
                 if (G_007EDC_LB_D2_VBLANK_INTERRUPT(r500_disp_int))
                         drm_handle_vblank(rdev->ddev, 1);
+                if (G_007EDC_DC_HOT_PLUG_DETECT1_INTERRUPT(r500_disp_int)) {
+                        DRM_INFO("HPD1\n");
+                }
+                if (G_007EDC_DC_HOT_PLUG_DETECT2_INTERRUPT(r500_disp_int)) {
+                        DRM_INFO("HPD2\n");
+                }
                 status = rs600_irq_ack(rdev, &r500_disp_int);
         }
         if (rdev->msi_enabled) {