drm/vc4: txp: Handle 40-bits DMA Addresses

The BCM2712 MOP and MOPLET can handle addresses larger than 32bits
through an extra register. We can easily support it and make it
conditional based on the compatible through a boolean in our variant
structure.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>

diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 7a78593..3596c01 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -550,6 +550,7 @@ struct vc4_txp_data {
        struct vc4_crtc_data    base;
        unsigned int has_byte_enable:1;
        unsigned int size_minus_one:1;
+       unsigned int supports_40bit_addresses:1;
 };
 
 extern const struct vc4_txp_data bcm2835_txp_data;

diff --git a/drivers/gpu/drm/vc4/vc4_txp.c b/drivers/gpu/drm/vc4/vc4_txp.c
index d2ee872..1858947 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_txp.c
+++ b/drivers/gpu/drm/vc4/vc4_txp.c
@@ -145,6 +145,8 @@
 /* Number of lines received and committed to memory. */
 #define TXP_PROGRESS           0x10
 
+#define TXP_DST_PTR_HIGH       0x1c
+
 #define TXP_READ(offset)                                                               \
        ({                                                                              \
                kunit_fail_current_test("Accessing a register in a unit test!\n");      \
@@ -293,6 +295,7 @@ static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
        struct drm_framebuffer *fb;
        unsigned int hdisplay;
        unsigned int vdisplay;
+       dma_addr_t addr;
        u32 ctrl;
        int idx;
        int i;
@@ -330,7 +333,12 @@ static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
                return;
 
        gem = drm_fb_dma_get_gem_obj(fb, 0);
-       TXP_WRITE(TXP_DST_PTR, gem->dma_addr + fb->offsets[0]);
+       addr = gem->dma_addr + fb->offsets[0];
+       TXP_WRITE(TXP_DST_PTR, lower_32_bits(addr));
+
+       if (txp_data->supports_40bit_addresses)
+               TXP_WRITE(TXP_DST_PTR_HIGH, upper_32_bits(addr) & 0xff);
+
        TXP_WRITE(TXP_DST_PITCH, fb->pitches[0]);
 
        hdisplay = mode->hdisplay ?: 1;