Re: [PATCH v8 1/7] drm: atmel-hlcdc: add driver ops to differentiate HLCDC and XLCDC IP

From: claudiu beznea
Date: Sat Feb 24 2024 - 07:50:15 EST

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On 21.02.2024 07:35, Manikandan Muralidharan wrote:
> Add LCD IP specific ops in driver data to differentiate
> HLCDC and XLCDC code within the atmel-hlcdc driver files.
> XLCDC in SAM9X7 has different sets of registers and additional
> configuration bits when compared to previous HLCDC IP. Read/write
> operation on the controller register and functionality is now
> separated using the LCD IP specific ops.
>
> Signed-off-by: Manikandan Muralidharan <manikandan.m@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 5 +
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h | 84 ++++++---
> .../gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 167 +++++++++++-------
> 3 files changed, 173 insertions(+), 83 deletions(-)
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index 84c54e8622d1..b09df821cbc0 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -58,6 +58,7 @@ static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_at91sam9n12 = {
> .conflicting_output_formats = true,
> .nlayers = ARRAY_SIZE(atmel_hlcdc_at91sam9n12_layers),
> .layers = atmel_hlcdc_at91sam9n12_layers,
> + .ops = &atmel_hlcdc_ops,
> };
>
> static const struct atmel_hlcdc_layer_desc atmel_hlcdc_at91sam9x5_layers[] = {
> @@ -151,6 +152,7 @@ static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_at91sam9x5 = {
> .conflicting_output_formats = true,
> .nlayers = ARRAY_SIZE(atmel_hlcdc_at91sam9x5_layers),
> .layers = atmel_hlcdc_at91sam9x5_layers,
> + .ops = &atmel_hlcdc_ops,
> };
>
> static const struct atmel_hlcdc_layer_desc atmel_hlcdc_sama5d3_layers[] = {
> @@ -269,6 +271,7 @@ static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_sama5d3 = {
> .conflicting_output_formats = true,
> .nlayers = ARRAY_SIZE(atmel_hlcdc_sama5d3_layers),
> .layers = atmel_hlcdc_sama5d3_layers,
> + .ops = &atmel_hlcdc_ops,
> };
>
> static const struct atmel_hlcdc_layer_desc atmel_hlcdc_sama5d4_layers[] = {
> @@ -364,6 +367,7 @@ static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_sama5d4 = {
> .max_hpw = 0x3ff,
> .nlayers = ARRAY_SIZE(atmel_hlcdc_sama5d4_layers),
> .layers = atmel_hlcdc_sama5d4_layers,
> + .ops = &atmel_hlcdc_ops,
> };
>
> static const struct atmel_hlcdc_layer_desc atmel_hlcdc_sam9x60_layers[] = {
> @@ -460,6 +464,7 @@ static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_sam9x60 = {
> .fixed_clksrc = true,
> .nlayers = ARRAY_SIZE(atmel_hlcdc_sam9x60_layers),
> .layers = atmel_hlcdc_sam9x60_layers,
> + .ops = &atmel_hlcdc_ops,
> };
>
> static const struct of_device_id atmel_hlcdc_of_match[] = {
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> index 5b5c774e0edf..ad732edfef0b 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> @@ -288,6 +288,64 @@ atmel_hlcdc_layer_to_plane(struct atmel_hlcdc_layer *layer)
> return container_of(layer, struct atmel_hlcdc_plane, layer);
> }
>
> +/**
> + * Atmel HLCDC Display Controller.

This doens't comply w/ recommendation at
https://docs.kernel.org/doc-guide/kernel-doc.html#structure-union-and-enumeration-documentation

> + *
> + * @desc: HLCDC Display Controller description
> + * @dscrpool: DMA coherent pool used to allocate DMA descriptors
> + * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
> + * @fbdev: framebuffer device attached to the Display Controller
> + * @crtc: CRTC provided by the display controller
> + * @planes: instantiated planes
> + * @layers: active HLCDC layers
> + * @suspend: used to store the HLCDC state when entering suspend

Check this for nested struct documentation:
https://docs.kernel.org/doc-guide/kernel-doc.html#nested-structs-unions

> + */
> +struct atmel_hlcdc_dc {
> + const struct atmel_hlcdc_dc_desc *desc;
> + struct dma_pool *dscrpool;
> + struct atmel_hlcdc *hlcdc;
> + struct drm_crtc *crtc;
> + struct atmel_hlcdc_layer *layers[ATMEL_HLCDC_MAX_LAYERS];
> + struct {
> + u32 imr;
> + struct drm_atomic_state *state;
> + } suspend;
> +};
> +
> +struct atmel_hlcdc_plane_state;
> +
> +/**
> + * struct atmel_lcdc_dc_ops - describes atmel_lcdc ops group
> + * to differentiate HLCDC and XLCDC IP code support
> + * @plane_setup_scaler: update the vertical and horizontal scaling factors
> + * @update_lcdc_buffers: update the each LCDC layers DMA registers
> + * @lcdc_atomic_disable: disable LCDC interrupts and layers
> + * @lcdc_update_general_settings: update each LCDC layers general
> + * confiugration register

s/confiugration/configuration

> + * @lcdc_atomic_update: enable the LCDC layers and interrupts
> + * @lcdc_csc_init: update the color space conversion co-efficient of
> + * High-end overlay register
> + * @lcdc_irq_dbg: to raise alert incase of interrupt overrun in any LCDC layer
> + */
> +struct atmel_lcdc_dc_ops {
> + void (*plane_setup_scaler)(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state);
> + void (*update_lcdc_buffers)(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state,
> + u32 sr, int i);
> + void (*lcdc_atomic_disable)(struct atmel_hlcdc_plane *plane);
> + void (*lcdc_update_general_settings)(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state);
> + void (*lcdc_atomic_update)(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_dc *dc);
> + void (*lcdc_csc_init)(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc);
> + void (*lcdc_irq_dbg)(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc);
> +};
> +
> +extern const struct atmel_lcdc_dc_ops atmel_hlcdc_ops;
> +
> /**
> * Atmel HLCDC Display Controller description structure.
> *
> @@ -306,6 +364,7 @@ atmel_hlcdc_layer_to_plane(struct atmel_hlcdc_layer *layer)
> * @fixed_clksrc: true if clock source is fixed
> * @layers: a layer description table describing available layers
> * @nlayers: layer description table size
> + * @ops: atmel lcdc dc ops
> */
> struct atmel_hlcdc_dc_desc {
> int min_width;
> @@ -319,30 +378,7 @@ struct atmel_hlcdc_dc_desc {
> bool fixed_clksrc;
> const struct atmel_hlcdc_layer_desc *layers;
> int nlayers;
> -};
> -
> -/**
> - * Atmel HLCDC Display Controller.
> - *
> - * @desc: HLCDC Display Controller description
> - * @dscrpool: DMA coherent pool used to allocate DMA descriptors
> - * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
> - * @fbdev: framebuffer device attached to the Display Controller
> - * @crtc: CRTC provided by the display controller
> - * @planes: instantiated planes
> - * @layers: active HLCDC layers
> - * @suspend: used to store the HLCDC state when entering suspend
> - */
> -struct atmel_hlcdc_dc {
> - const struct atmel_hlcdc_dc_desc *desc;
> - struct dma_pool *dscrpool;
> - struct atmel_hlcdc *hlcdc;
> - struct drm_crtc *crtc;
> - struct atmel_hlcdc_layer *layers[ATMEL_HLCDC_MAX_LAYERS];
> - struct {
> - u32 imr;
> - struct drm_atomic_state *state;
> - } suspend;
> + const struct atmel_lcdc_dc_ops *ops;
> };
>
> extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats;
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> index daa508504f47..3427546cd58c 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -282,8 +282,9 @@ atmel_hlcdc_plane_scaler_set_phicoeff(struct atmel_hlcdc_plane *plane,
> coeff_tab[i]);
> }
>
> -static void atmel_hlcdc_plane_setup_scaler(struct atmel_hlcdc_plane *plane,
> - struct atmel_hlcdc_plane_state *state)
> +static
> +void atmel_hlcdc_plane_setup_scaler(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state)
> {
> const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> u32 xfactor, yfactor;
> @@ -335,6 +336,7 @@ atmel_hlcdc_plane_update_pos_and_size(struct atmel_hlcdc_plane *plane,
> struct atmel_hlcdc_plane_state *state)
> {
> const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> + struct atmel_hlcdc_dc *dc = plane->base.dev->dev_private;
>
> if (desc->layout.size)
> atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.size,
> @@ -352,12 +354,12 @@ atmel_hlcdc_plane_update_pos_and_size(struct atmel_hlcdc_plane *plane,
> ATMEL_HLCDC_LAYER_POS(state->crtc_x,
> state->crtc_y));
>
> - atmel_hlcdc_plane_setup_scaler(plane, state);
> + dc->desc->ops->plane_setup_scaler(plane, state);
> }
>
> -static void
> -atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> - struct atmel_hlcdc_plane_state *state)
> +static
> +void atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state)
> {
> unsigned int cfg = ATMEL_HLCDC_LAYER_DMA_BLEN_INCR16 | state->ahb_id;
> const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> @@ -437,10 +439,33 @@ static void atmel_hlcdc_plane_update_clut(struct atmel_hlcdc_plane *plane,
> }
> }
>
> +static void update_hlcdc_buffers(struct atmel_hlcdc_plane *plane,

would be good to keep in in the atmel_hlcdc/atmel namespace thus, rename it
something like:

*atmel_hlcdc*_update_buffers()

to avoid conflicting with any subsystem specific APIs, if any. And also
keep consistency with the rest of the HLCDC driver code.

> + struct atmel_hlcdc_plane_state *state,
> + u32 sr, int i)
> +{
> + atmel_hlcdc_layer_write_reg(&plane->layer,
> + ATMEL_HLCDC_LAYER_PLANE_HEAD(i),
> + state->dscrs[i]->self);
> +
> + if (sr & ATMEL_HLCDC_LAYER_EN)
> + return;
> +
> + atmel_hlcdc_layer_write_reg(&plane->layer,
> + ATMEL_HLCDC_LAYER_PLANE_ADDR(i),
> + state->dscrs[i]->addr);
> + atmel_hlcdc_layer_write_reg(&plane->layer,
> + ATMEL_HLCDC_LAYER_PLANE_CTRL(i),
> + state->dscrs[i]->ctrl);
> + atmel_hlcdc_layer_write_reg(&plane->layer,
> + ATMEL_HLCDC_LAYER_PLANE_NEXT(i),
> + state->dscrs[i]->self);
> +}
> +
> static void atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
> - struct atmel_hlcdc_plane_state *state)
> + struct atmel_hlcdc_plane_state *state)
> {
> const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> + struct atmel_hlcdc_dc *dc = plane->base.dev->dev_private;
> struct drm_framebuffer *fb = state->base.fb;
> u32 sr;
> int i;
> @@ -452,21 +477,7 @@ static void atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
>
> state->dscrs[i]->addr = gem->dma_addr + state->offsets[i];
>
> - atmel_hlcdc_layer_write_reg(&plane->layer,
> - ATMEL_HLCDC_LAYER_PLANE_HEAD(i),
> - state->dscrs[i]->self);
> -
> - if (!(sr & ATMEL_HLCDC_LAYER_EN)) {
> - atmel_hlcdc_layer_write_reg(&plane->layer,
> - ATMEL_HLCDC_LAYER_PLANE_ADDR(i),
> - state->dscrs[i]->addr);
> - atmel_hlcdc_layer_write_reg(&plane->layer,
> - ATMEL_HLCDC_LAYER_PLANE_CTRL(i),
> - state->dscrs[i]->ctrl);
> - atmel_hlcdc_layer_write_reg(&plane->layer,
> - ATMEL_HLCDC_LAYER_PLANE_NEXT(i),
> - state->dscrs[i]->self);
> - }
> + dc->desc->ops->update_lcdc_buffers(plane, state, sr, i);
>
> if (desc->layout.xstride[i])
> atmel_hlcdc_layer_write_cfg(&plane->layer,
> @@ -712,11 +723,8 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
> return 0;
> }
>
> -static void atmel_hlcdc_plane_atomic_disable(struct drm_plane *p,
> - struct drm_atomic_state *state)
> +static void hlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)

Same here, e.g., *atmel_hlcdc*_atomic_disable()

> {
> - struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> -
> /* Disable interrupts */
> atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_HLCDC_LAYER_IDR,
> 0xffffffff);
> @@ -731,6 +739,34 @@ static void atmel_hlcdc_plane_atomic_disable(struct drm_plane *p,
> atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_ISR);
> }
>
> +static void atmel_hlcdc_plane_atomic_disable(struct drm_plane *p,
> + struct drm_atomic_state *state)
> +{
> + struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> + struct atmel_hlcdc_dc *dc = plane->base.dev->dev_private;
> +
> + dc->desc->ops->lcdc_atomic_disable(plane);
> +}
> +
> +static void hlcdc_atomic_update(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_dc *dc)

Same here, e.g., *atmel_hlcdc*_hlcdc_atomic_update()

> +{
> + u32 sr;
> +
> + /* Enable the overrun interrupts. */
> + atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_HLCDC_LAYER_IER,
> + ATMEL_HLCDC_LAYER_OVR_IRQ(0) |
> + ATMEL_HLCDC_LAYER_OVR_IRQ(1) |
> + ATMEL_HLCDC_LAYER_OVR_IRQ(2));
> +
> + /* Apply the new config at the next SOF event. */
> + sr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_CHSR);
> + atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_HLCDC_LAYER_CHER,
> + ATMEL_HLCDC_LAYER_UPDATE |
> + (sr & ATMEL_HLCDC_LAYER_EN ?
> + ATMEL_HLCDC_LAYER_A2Q : ATMEL_HLCDC_LAYER_EN));
> +}
> +
> static void atmel_hlcdc_plane_atomic_update(struct drm_plane *p,
> struct drm_atomic_state *state)
> {
> @@ -739,7 +775,7 @@ static void atmel_hlcdc_plane_atomic_update(struct drm_plane *p,
> struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> struct atmel_hlcdc_plane_state *hstate =
> drm_plane_state_to_atmel_hlcdc_plane_state(new_s);
> - u32 sr;
> + struct atmel_hlcdc_dc *dc = p->dev->dev_private;
>
> if (!new_s->crtc || !new_s->fb)
> return;
> @@ -750,29 +786,39 @@ static void atmel_hlcdc_plane_atomic_update(struct drm_plane *p,
> }
>
> atmel_hlcdc_plane_update_pos_and_size(plane, hstate);
> - atmel_hlcdc_plane_update_general_settings(plane, hstate);
> + dc->desc->ops->lcdc_update_general_settings(plane, hstate);
> atmel_hlcdc_plane_update_format(plane, hstate);
> atmel_hlcdc_plane_update_clut(plane, hstate);
> atmel_hlcdc_plane_update_buffers(plane, hstate);
> atmel_hlcdc_plane_update_disc_area(plane, hstate);
>
> - /* Enable the overrun interrupts. */
> - atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_HLCDC_LAYER_IER,
> - ATMEL_HLCDC_LAYER_OVR_IRQ(0) |
> - ATMEL_HLCDC_LAYER_OVR_IRQ(1) |
> - ATMEL_HLCDC_LAYER_OVR_IRQ(2));
> + dc->desc->ops->lcdc_atomic_update(plane, dc);
> +}
>
> - /* Apply the new config at the next SOF event. */
> - sr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_CHSR);
> - atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_HLCDC_LAYER_CHER,
> - ATMEL_HLCDC_LAYER_UPDATE |
> - (sr & ATMEL_HLCDC_LAYER_EN ?
> - ATMEL_HLCDC_LAYER_A2Q : ATMEL_HLCDC_LAYER_EN));
> +static void hlcdc_csc_init(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc)

Same here.

> +{
> + /*
> + * TODO: declare a "yuv-to-rgb-conv-factors" property to let
> + * userspace modify these factors (using a BLOB property ?).
> + */
> + static const u32 hlcdc_csc_coeffs[] = {
> + 0x4c900091,
> + 0x7a5f5090,
> + 0x40040890
> + };
> +
> + for (int i = 0; i < ARRAY_SIZE(hlcdc_csc_coeffs); i++) {
> + atmel_hlcdc_layer_write_cfg(&plane->layer,
> + desc->layout.csc + i,
> + hlcdc_csc_coeffs[i]);
> + }
> }
>
> static int atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane)
> {
> const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> + struct atmel_hlcdc_dc *dc = plane->base.dev->dev_private;
>
> if (desc->type == ATMEL_HLCDC_OVERLAY_LAYER ||
> desc->type == ATMEL_HLCDC_CURSOR_LAYER) {
> @@ -796,31 +842,16 @@ static int atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane)
> return ret;
> }
>
> - if (desc->layout.csc) {
> - /*
> - * TODO: decare a "yuv-to-rgb-conv-factors" property to let
> - * userspace modify these factors (using a BLOB property ?).
> - */
> - atmel_hlcdc_layer_write_cfg(&plane->layer,
> - desc->layout.csc,
> - 0x4c900091);
> - atmel_hlcdc_layer_write_cfg(&plane->layer,
> - desc->layout.csc + 1,
> - 0x7a5f5090);
> - atmel_hlcdc_layer_write_cfg(&plane->layer,
> - desc->layout.csc + 2,
> - 0x40040890);
> - }
> + if (desc->layout.csc)
> + dc->desc->ops->lcdc_csc_init(plane, desc);
>
> return 0;
> }
>
> -void atmel_hlcdc_plane_irq(struct atmel_hlcdc_plane *plane)
> +static void hlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc)

same here.

> {
> - const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> - u32 isr;
> -
> - isr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_ISR);
> + u32 isr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_ISR);
>
> /*
> * There's not much we can do in case of overrun except informing
> @@ -834,6 +865,24 @@ void atmel_hlcdc_plane_irq(struct atmel_hlcdc_plane *plane)
> desc->name);
> }
>
> +void atmel_hlcdc_plane_irq(struct atmel_hlcdc_plane *plane)
> +{
> + const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> + struct atmel_hlcdc_dc *dc = plane->base.dev->dev_private;
> +
> + dc->desc->ops->lcdc_irq_dbg(plane, desc);
> +}
> +
> +const struct atmel_lcdc_dc_ops atmel_hlcdc_ops = {
> + .plane_setup_scaler = atmel_hlcdc_plane_setup_scaler,
> + .update_lcdc_buffers = update_hlcdc_buffers,
> + .lcdc_atomic_disable = hlcdc_atomic_disable,
> + .lcdc_update_general_settings = atmel_hlcdc_plane_update_general_settings,
> + .lcdc_atomic_update = hlcdc_atomic_update,
> + .lcdc_csc_init = hlcdc_csc_init,
> + .lcdc_irq_dbg = hlcdc_irq_dbg,
> +};
> +
> static const struct drm_plane_helper_funcs atmel_hlcdc_layer_plane_helper_funcs = {
> .atomic_check = atmel_hlcdc_plane_atomic_check,
> .atomic_update = atmel_hlcdc_plane_atomic_update,

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