From e6dd0fc9114e232b2ca5897ca20ea367227eb268 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Fri, 25 Oct 2024 18:15:48 +0100 Subject: [PATCH] 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 Link: https://patchwork.freedesktop.org/patch/msgid/20241025-drm-vc4-2712-support-v2-17-35efa83c8fc0@raspberrypi.com Signed-off-by: Dave Stevenson --- drivers/gpu/drm/vc4/vc4_drv.h | 2 ++ drivers/gpu/drm/vc4/vc4_txp.c | 12 +++++++++++- 2 files changed, 13 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/vc4/vc4_drv.h +++ b/drivers/gpu/drm/vc4/vc4_drv.h @@ -538,8 +538,10 @@ struct vc4_crtc_data { struct vc4_txp_data { struct vc4_crtc_data base; + unsigned int high_addr_ptr_reg; 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; --- a/drivers/gpu/drm/vc4/vc4_txp.c +++ b/drivers/gpu/drm/vc4/vc4_txp.c @@ -145,6 +145,9 @@ /* Number of lines received and committed to memory. */ #define TXP_PROGRESS 0x10 +#define TXP_DST_PTR_HIGH_MOPLET 0x1c +#define TXP_DST_PTR_HIGH_MOP 0x24 + #define TXP_READ(offset) \ ({ \ kunit_fail_current_test("Accessing a register in a unit test!\n"); \ @@ -293,6 +296,7 @@ static void vc4_txp_connector_atomic_com struct drm_framebuffer *fb; unsigned int hdisplay; unsigned int vdisplay; + dma_addr_t addr; u32 ctrl; int idx; int i; @@ -330,7 +334,13 @@ static void vc4_txp_connector_atomic_com 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_data->high_addr_ptr_reg, upper_32_bits(addr) & 0xff); + TXP_WRITE(TXP_DST_PITCH, fb->pitches[0]); hdisplay = mode->hdisplay ?: 1;