linux/drivers/gpu/drm/tilcdc, branch v4.6

drm/tilcdc: Use devm_kzalloc() and devm_kcalloc() for private data

2016-02-25T14:39:47Z

Use devm_kzalloc() and devm_kcalloc() for private data allocation at driver load time. Signed-off-by: Jyri Sarha Reviewed-by: Tomi Valkeinen

drm/tilcdc: Initialize crtc->port

2016-02-25T14:39:46Z

Initialize port device node pointer in the tilcdc crtc. Fixes "Falling back to first CRTC" warning from tda998x driver. The tda998x encoder driver calls drm_of_find_possible_crtcs() to initialize possible_crtcs of struct drm_encoder. The crtc->port needs to be initialized for drm_of_find_possible_crtcs() to work. Signed-off-by: Jyri Sarha Reviewed-by: Tomi Valkeinen

drm/tilcdc: Disable sync lost interrupt if it fires on every frame

2016-02-25T14:39:45Z

Disable the sync lost interrupt if it fires on every frame for 50 consecutive frames in a row. This is relatively sure sign of the sync lost interrupt being stuck and firing on every frame even if the display otherwise appears to work OK. Signed-off-by: Jyri Sarha Reviewed-by: Tomi Valkeinen

drm/tilcdc: Add prints on sync lost and FIFO underrun interrupts

2016-02-25T14:39:44Z

Add ratelimited prints on sync lost and FIFO underrun interrupts. Signed-off-by: Jyri Sarha Reviewed-by: Tomi Valkeinen

drm/tilcdc: Remove the duplicate LCDC_INT_ENABLE_SET_REG in registers[]

2016-02-25T14:39:43Z

Removes the duplicate LCDC_INT_ENABLE_SET_REG-entry in registers array. Signed-off-by: Jyri Sarha Reviewed-by: Tomi Valkeinen

drm/tilcdc: Fix interrupt enable/disable code for version 2 tilcdc

2016-02-25T14:39:42Z

Fix interrupt enable/disable code for version 2 tilcdc. In version 2 tilcdc there is a separate register for disabling interrupts. Writing 0 to enable registers bits does not have any effect. The interrupt clear register works the same way, writing 1 to specific bit disables the interrupt and writing 0 does not have any effect. The "bug" that is fixed here does not really do any harm since the interrupts are enabled only once in the power up and disabled before power down. Signed-off-by: Jyri Sarha Reviewed-by: Tomi Valkeinen

drm/tilcdc: Do not update the next frame buffer close to vertical blank

2016-02-25T14:39:41Z

Do not update the next frame buffer close to vertical blank. This is to avoid situation when the frame changes between writing of LCDC_DMA_FB_BASE_ADDR_0_REG and LCDC_DMA_FB_CEILING_ADDR_0_REG. Signed-off-by: Tomi Valkeinen [Added description to the patch] Signed-off-by: Jyri Sarha

drm/tilcdc: Get rid of complex ping-pong mechanism

2016-02-25T14:39:40Z

Get rid of complex ping-pong mechanism and replace it with simpler single buffer flipping code. The LCDC HW appears to be designed mainly static framebuffers in mind. There are two modes of operation, either static single buffer, or ping pong double buffering with two static buffers switching back and forth. Luckily the framebuffer start address is fetched only in the beginning of the frame and changing the address after that only takes effect after the next vertical blank. The page flipping code can simply write the address of the new framebuffer and the page is flipped automatically after the next vertical blank. Using the ping pong double buffering makes the flipping code way more complex and it does not provide any benefit, so it is better to switch to single buffer operation. There is still one problem in updating the framebuffer dma address on the fly. There are two registers defining the framebuffer dma area and things may break if the dma address is fetched in while the registers are are being updated. Signed-off-by: Tomi Valkeinen [Added description to the patch] Signed-off-by: Jyri Sarha

drm/tilcdc: cleanup irq handling

2016-02-25T14:39:40Z

Cleanup irq handling. Clear the irq status unconditionally and restructure the status bit conditions. Signed-off-by: Tomi Valkeinen [Added description to the patch] Signed-off-by: Jyri Sarha

drm/tilcdc: remove broken error handling

2016-02-25T14:39:39Z

Remove broken error handling. The condition for handling the LCDC_SYNC_LOST and LCDC_FIFO_UNDERFLOW could never be satisfied as the LCDC_SYNC_LOST interrupt is not enabled. Also the requirement to have both LCDC_SYNC_LOST and LCDC_FIFO_UNDERFLOW fired at once before handling the error looks weird. Signed-off-by: Tomi Valkeinen [Added description to the patch] Signed-off-by: Jyri Sarha