[PATCH v4 13/14] drm/mxsfb: Add support for horizontal stride
Stefan Agner
stefan at agner.ch
Mon Oct 14 12:40:55 UTC 2019
Hi Robert,
Sorry it took me so long to have a closer look at this patchset.
I will definitely merge part of it, but this particular patch actually
breaks i.MX 7. I have vertical stripes on my display with this patch
applied (using Weston with DRM backend). Not sure why this exactly
happens, from what I understand this should only affect IP Version 4.
Some notes below:
On 2019-08-29 13:30, Robert Chiras wrote:
> Besides the eLCDIF block, there is another IP block, used in the past
> for EPDC panels. Since the iMX.8mq doesn't have an EPDC connector, this
> block is not documented, but we can use it to do additional operations
> on the frame buffer.
Hm, but this block is part of the ELCDIF block, in terms of clock, power
domain etc?
> In this case, we can use the pigeon registers from this IP block in
> order to do horizontal crop on the frame buffer processed by the eLCDIF
> block.
>
> Signed-off-by: Robert Chiras <robert.chiras at nxp.com>
> Tested-by: Guido Günther <agx at sigxcpu.org>
> ---
> drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 79 ++++++++++++++++++++++++++++++++++++--
> drivers/gpu/drm/mxsfb/mxsfb_drv.c | 1 +
> drivers/gpu/drm/mxsfb/mxsfb_regs.h | 16 ++++++++
> 3 files changed, 92 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
> b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
> index a12f53d..317575e 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
> @@ -15,6 +15,7 @@
>
> #include <video/videomode.h>
>
> +#include <drm/drm_atomic.h>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_crtc.h>
> #include <drm/drm_fb_cma_helper.h>
> @@ -435,13 +436,66 @@ void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb)
> clk_disable_unprepare(mxsfb->clk_axi);
> }
>
> +void mxsfb_set_fb_hcrop(struct mxsfb_drm_private *mxsfb, u32 src_w, u32 fb_w)
> +{
> + u32 mask_cnt, htotal, hcount;
> + u32 vdctrl2, vdctrl3, vdctrl4, transfer_count;
> + u32 pigeon_12_0, pigeon_12_1, pigeon_12_2;
> +
> + if (src_w == fb_w) {
> + writel(0x0, mxsfb->base + HW_EPDC_PIGEON_12_0);
> + writel(0x0, mxsfb->base + HW_EPDC_PIGEON_12_1);
> +
> + return;
> + }
> +
> + transfer_count = readl(mxsfb->base + LCDC_V4_TRANSFER_COUNT);
> + hcount = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
> +
> + transfer_count &= ~TRANSFER_COUNT_SET_HCOUNT(0xffff);
> + transfer_count |= TRANSFER_COUNT_SET_HCOUNT(fb_w);
> + writel(transfer_count, mxsfb->base + LCDC_V4_TRANSFER_COUNT);
> +
> + vdctrl2 = readl(mxsfb->base + LCDC_VDCTRL2);
> + htotal = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2);
> + htotal += fb_w - hcount;
> + vdctrl2 &= ~VDCTRL2_SET_HSYNC_PERIOD(0x3ffff);
> + vdctrl2 |= VDCTRL2_SET_HSYNC_PERIOD(htotal);
> + writel(vdctrl2, mxsfb->base + LCDC_VDCTRL2);
> +
> + vdctrl4 = readl(mxsfb->base + LCDC_VDCTRL4);
> + vdctrl4 &= ~SET_DOTCLK_H_VALID_DATA_CNT(0x3ffff);
> + vdctrl4 |= SET_DOTCLK_H_VALID_DATA_CNT(fb_w);
> + writel(vdctrl4, mxsfb->base + LCDC_VDCTRL4);
> +
> + /* configure related pigeon registers */
> + vdctrl3 = readl(mxsfb->base + LCDC_VDCTRL3);
> + mask_cnt = GET_HOR_WAIT_CNT(vdctrl3) - 5;
> +
> + pigeon_12_0 = PIGEON_12_0_SET_STATE_MASK(0x24) |
> + PIGEON_12_0_SET_MASK_CNT(mask_cnt) |
> + PIGEON_12_0_SET_MASK_CNT_SEL(0x6) |
> + PIGEON_12_0_POL_ACTIVE_LOW |
> + PIGEON_12_0_EN;
> + writel(pigeon_12_0, mxsfb->base + HW_EPDC_PIGEON_12_0);
> +
> + pigeon_12_1 = PIGEON_12_1_SET_CLR_CNT(src_w) |
> + PIGEON_12_1_SET_SET_CNT(0x0);
> + writel(pigeon_12_1, mxsfb->base + HW_EPDC_PIGEON_12_1);
> +
> + pigeon_12_2 = 0x0;
> + writel(pigeon_12_2, mxsfb->base + HW_EPDC_PIGEON_12_2);
> +}
> +
> void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
> struct drm_plane_state *state)
> {
> struct drm_simple_display_pipe *pipe = &mxsfb->pipe;
> struct drm_crtc *crtc = &pipe->crtc;
> + struct drm_plane_state *new_state = pipe->plane.state;
> + struct drm_framebuffer *fb = pipe->plane.state->fb;
> struct drm_pending_vblank_event *event;
> - dma_addr_t paddr;
> + u32 fb_addr, src_off, src_w, stride, cpp = 0;
dma_addr_t seems to be the better type here, why change?
>
> spin_lock_irq(&crtc->dev->event_lock);
> event = crtc->state->event;
> @@ -456,10 +510,27 @@ void mxsfb_plane_atomic_update(struct
> mxsfb_drm_private *mxsfb,
> }
> spin_unlock_irq(&crtc->dev->event_lock);
>
> - paddr = mxsfb_get_fb_paddr(mxsfb);
> - if (paddr) {
> + if (!fb)
> + return;
> +
> + fb_addr = mxsfb_get_fb_paddr(mxsfb);
> + if (mxsfb->devdata->ipversion >= 4) {
> + cpp = fb->format->cpp[0];
> + src_off = (new_state->src_y >> 16) * fb->pitches[0] +
> + (new_state->src_x >> 16) * cpp;
> + fb_addr += fb->offsets[0] + src_off;
> + }
> +
> + if (fb_addr) {
> clk_prepare_enable(mxsfb->clk_axi);
> - writel(paddr, mxsfb->base + mxsfb->devdata->next_buf);
> + writel(fb_addr, mxsfb->base + mxsfb->devdata->next_buf);
> clk_disable_unprepare(mxsfb->clk_axi);
> }
> +
> + if (mxsfb->devdata->ipversion >= 4 &&
> + unlikely(drm_atomic_crtc_needs_modeset(new_state->crtc->state))) {
> + stride = DIV_ROUND_UP(fb->pitches[0], cpp);
> + src_w = new_state->src_w >> 16;
> + mxsfb_set_fb_hcrop(mxsfb, src_w, stride);
> + }
> }
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index 888b520..06d3bf0 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -133,6 +133,7 @@ static int mxsfb_atomic_helper_check(struct drm_device *dev,
> if (old_bpp != new_bpp)
> new_state->mode_changed = true;
> }
> +
Can you also drop this unrelated change?
--
Stefan
> return ret;
> }
>
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_regs.h
> b/drivers/gpu/drm/mxsfb/mxsfb_regs.h
> index 0f63ba1..df3279b 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_regs.h
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_regs.h
> @@ -145,6 +145,22 @@
> #define DEBUG0_HSYNC BIT(26)
> #define DEBUG0_VSYNC BIT(25)
>
> +/* pigeon registers for crop */
> +#define HW_EPDC_PIGEON_12_0 0xb00
> +#define HW_EPDC_PIGEON_12_1 0xb10
> +#define HW_EPDC_PIGEON_12_2 0xb20
> +
> +#define PIGEON_12_0_SET_STATE_MASK(x) REG_PUT((x), 31, 24)
> +#define PIGEON_12_0_SET_MASK_CNT(x) REG_PUT((x), 23, 12)
> +#define PIGEON_12_0_SET_MASK_CNT_SEL(x) REG_PUT((x), 11, 8)
> +#define PIGEON_12_0_SET_OFFSET(x) REG_PUT((x), 7, 4)
> +#define PIGEON_12_0_SET_INC_SEL(x) REG_PUT((x), 3, 2)
> +#define PIGEON_12_0_POL_ACTIVE_LOW BIT(1)
> +#define PIGEON_12_0_EN BIT(0)
> +
> +#define PIGEON_12_1_SET_CLR_CNT(x) REG_PUT((x), 31, 16)
> +#define PIGEON_12_1_SET_SET_CNT(x) REG_PUT((x), 15, 0)
> +
> #define MXSFB_MIN_XRES 120
> #define MXSFB_MIN_YRES 120
> #define MXSFB_MAX_XRES 0xffff
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