Re: [PATCH v5 5/8] drm: atmel_hlcdc: Add support for XLCDC in atmel LCD driver

From: claudiu beznea
Date: Mon Sep 25 2023 - 10:17:27 EST

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On 15.09.2023 13:48, Manikandan Muralidharan wrote:
> - XLCDC in SAM9X7 has different sets of registers and additional
> configuration bits when compared to previous HLCDC IP. Read/write
> operation on the controller registers is now separated using the
> XLCDC status flag and with HLCDC and XLCDC IP specific ops.
> - HEO scaling, window resampling, Alpha blending, YUV-to-RGB
> conversion in XLCDC is derived and handled using additional
> configuration bits and registers.
> - Writing one to the Enable fields of each layer in LCD_ATTRE
> is required to reflect the values set in Configuration, FBA, Enable
> registers of each layer

Having "-" may be interpreted as you are doing multiple things in this patch.

>
> Signed-off-by: Manikandan Muralidharan <manikandan.m@xxxxxxxxxxxxx>
> Co-developed-by: Hari Prasath Gujulan Elango <Hari.PrasathGE@xxxxxxxxxxxxx>
> Signed-off-by: Hari Prasath Gujulan Elango <Hari.PrasathGE@xxxxxxxxxxxxx>
> Co-developed-by: Durai Manickam KR <durai.manickamkr@xxxxxxxxxxxxx>
> Signed-off-by: Durai Manickam KR <durai.manickamkr@xxxxxxxxxxxxx>
> ---
> .../gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 33 +-
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 26 ++
> .../gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 317 ++++++++++++++----
> 3 files changed, 315 insertions(+), 61 deletions(-)
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> index cc5cf4c2faf7..1ac31c0c474a 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> @@ -79,6 +79,7 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
> unsigned int mask = ATMEL_HLCDC_CLKDIV_MASK | ATMEL_HLCDC_CLKPOL;
> unsigned int cfg = 0;
> int div, ret;
> + bool is_xlcdc = crtc->dc->desc->is_xlcdc;
>
> /* get encoder from crtc */
> drm_for_each_encoder(en_iter, ddev) {
> @@ -164,10 +165,10 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
> state = drm_crtc_state_to_atmel_hlcdc_crtc_state(c->state);
> cfg = state->output_mode << 8;
>
> - if (adj->flags & DRM_MODE_FLAG_NVSYNC)
> + if (!is_xlcdc && (adj->flags & DRM_MODE_FLAG_NVSYNC))
> cfg |= ATMEL_HLCDC_VSPOL;
>
> - if (adj->flags & DRM_MODE_FLAG_NHSYNC)
> + if (!is_xlcdc && (adj->flags & DRM_MODE_FLAG_NHSYNC))
> cfg |= ATMEL_HLCDC_HSPOL;
>
> regmap_update_bits(regmap, ATMEL_HLCDC_CFG(5),
> @@ -202,6 +203,20 @@ static void atmel_hlcdc_crtc_atomic_disable(struct drm_crtc *c,
>
> pm_runtime_get_sync(dev->dev);
>
> + if (crtc->dc->desc->is_xlcdc) {
> + regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_XLCDC_CM);
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + !(status & ATMEL_XLCDC_CM),
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register CMSTS timeout\n");
> +
> + regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_XLCDC_SD);
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + status & ATMEL_XLCDC_SD,
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register SDSTS timeout\n");
> + }
> +
> regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
> while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> (status & ATMEL_HLCDC_DISP))
> @@ -256,6 +271,20 @@ static void atmel_hlcdc_crtc_atomic_enable(struct drm_crtc *c,
> !(status & ATMEL_HLCDC_DISP))
> cpu_relax();
>
> + if (crtc->dc->desc->is_xlcdc) {
> + regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_XLCDC_CM);
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + status & ATMEL_XLCDC_CM,
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register CMSTS timeout\n");
> +
> + regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_XLCDC_SD);
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + !(status & ATMEL_XLCDC_SD),
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register SDSTS timeout\n");
> + }
> +
> pm_runtime_put_sync(dev->dev);
>
> }
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index d30aec174aa2..7702c2f16178 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -30,6 +30,26 @@
>
> #define ATMEL_HLCDC_LAYER_IRQS_OFFSET 8
>
> +static const struct atmel_lcdc_dc_ops atmel_hlcdc_ops = {

there are 2 spaces b/w atmel_lcdc_dc_ops and 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 atmel_lcdc_dc_ops atmel_xlcdc_ops = {

Same here.

> + .plane_setup_scaler = atmel_xlcdc_plane_setup_scaler,
> + .update_lcdc_buffers = update_xlcdc_buffers,
> + .lcdc_atomic_disable = xlcdc_atomic_disable,
> + .lcdc_update_general_settings = atmel_xlcdc_plane_update_general_settings,
> + .lcdc_atomic_update = xlcdc_atomic_update,
> + .lcdc_csc_init = xlcdc_csc_init,
> + .lcdc_irq_dbg = xlcdc_irq_dbg,
> +};
> +
> static const struct atmel_hlcdc_layer_desc atmel_hlcdc_at91sam9n12_layers[] = {
> {
> .name = "base",
> @@ -58,6 +78,7 @@ 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 +172,7 @@ 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 +291,7 @@ 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 +387,7 @@ 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 +484,7 @@ 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 atmel_hlcdc_layer_desc atmel_xlcdc_sam9x75_layers[] = {
> @@ -553,6 +578,7 @@ static const struct atmel_hlcdc_dc_desc atmel_xlcdc_dc_sam9x75 = {
> .is_xlcdc = true,
> .nlayers = ARRAY_SIZE(atmel_xlcdc_sam9x75_layers),
> .layers = atmel_xlcdc_sam9x75_layers,
> + .ops = &atmel_xlcdc_ops,
> };
>
> static const struct of_device_id atmel_hlcdc_of_match[] = {
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> index daa508504f47..e2a5bed86fdb 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -282,7 +282,7 @@ 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,
> +void atmel_hlcdc_plane_setup_scaler(struct atmel_hlcdc_plane *plane,
> struct atmel_hlcdc_plane_state *state)

run checkpatch.pl on scripts: align struct atmel_hlcdc_plane_state *state
with (. But may not be needed if follows advices on previous patches.

> {
> const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> @@ -330,11 +330,56 @@ static void atmel_hlcdc_plane_setup_scaler(struct atmel_hlcdc_plane *plane,
> yfactor));
> }
>
> +void atmel_xlcdc_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;
> +
> + if (!desc->layout.scaler_config)
> + return;
> +
> + if (state->crtc_w == state->src_w && state->crtc_h == state->src_h) {
> + atmel_hlcdc_layer_write_cfg(&plane->layer,
> + desc->layout.scaler_config, 0);
> + return;
> + }
> +
> + /* xfactor = round[(2^20 * XMEMSIZE)/XSIZE)] */
> + xfactor = (u32)(((1 << 20) * state->src_w) / state->crtc_w);
> +
> + /* yfactor = round[(2^20 * YMEMSIZE)/YSIZE)] */
> + yfactor = (u32)(((1 << 20) * state->src_h) / state->crtc_h);
> +
> + atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.scaler_config,
> + ATMEL_XLCDC_LAYER_VSCALER_LUMA_ENABLE |
> + ATMEL_XLCDC_LAYER_VSCALER_CHROMA_ENABLE |
> + ATMEL_XLCDC_LAYER_HSCALER_LUMA_ENABLE |
> + ATMEL_XLCDC_LAYER_HSCALER_CHROMA_ENABLE);
> +
> + atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.scaler_config + 1,
> + yfactor);
> + atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.scaler_config + 3,
> + xfactor);
> +
> + /* As per YCbCr window resampling configuration */
> + if (state->base.fb->format->format == DRM_FORMAT_YUV420) {
> + yfactor /= 2;
> + xfactor /= 2;
> + } /* else As per ARGB window resampling configuration */

This kind of describing behavior is a bit odd. You could try to describe
what is needed before if statement.

> +
> + atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.scaler_config + 2,
> + yfactor);
> + atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.scaler_config + 4,
> + xfactor);
> +}
> +
> static void
> 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,
> @@ -352,10 +397,10 @@ 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
> +void
> atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> struct atmel_hlcdc_plane_state *state)
> {
> @@ -393,6 +438,40 @@ atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> cfg);
> }
>
> +void
> +atmel_xlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state)
> +{
> + unsigned int cfg;

Add it after pointers. Reverse christmass tree is more readable AFAICT.

> + const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> + const struct drm_format_info *format = state->base.fb->format;
> +
> + atmel_hlcdc_layer_write_cfg(&plane->layer, ATMEL_XLCDC_LAYER_DMA_CFG,
> + ATMEL_HLCDC_LAYER_DMA_BLEN_INCR16 | state->ahb_id);
> +
> + cfg = ATMEL_XLCDC_LAYER_DMA | ATMEL_XLCDC_LAYER_REP;
> +
> + if (plane->base.type != DRM_PLANE_TYPE_PRIMARY) {
> + /*
> + * Alpha Blending bits specific to SAM9X7 SoC
> + */
> + cfg |= ATMEL_XLCDC_LAYER_SFACTC_A0_MULT_AS |
> + ATMEL_XLCDC_LAYER_SFACTA_ONE |
> + ATMEL_XLCDC_LAYER_DFACTC_M_A0_MULT_AS |
> + ATMEL_XLCDC_LAYER_DFACTA_ONE;
> + if (format->has_alpha)
> + cfg |= ATMEL_XLCDC_LAYER_A0(0xff);
> + else
> + cfg |= ATMEL_XLCDC_LAYER_A0(state->base.alpha);
> + }
> +
> + if (state->disc_h && state->disc_w)
> + cfg |= ATMEL_XLCDC_LAYER_DISCEN;
> +
> + atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.general_config,
> + cfg);
> +}
> +
> static void atmel_hlcdc_plane_update_format(struct atmel_hlcdc_plane *plane,
> struct atmel_hlcdc_plane_state *state)
> {
> @@ -437,36 +516,53 @@ static void atmel_hlcdc_plane_update_clut(struct atmel_hlcdc_plane *plane,
> }
> }
>
> +void update_hlcdc_buffers(struct atmel_hlcdc_plane *plane,
> + 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;

One extra line here makes it more readable.

> + 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);
> +}
> +
> +void update_xlcdc_buffers(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state,
> + u32 sr, int i)
> +{
> + atmel_hlcdc_layer_write_reg(&plane->layer,
> + ATMEL_XLCDC_LAYER_PLANE_ADDR(i),
> + state->dscrs[i]->addr);
> +}
> +
> 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;
>
> - sr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_CHSR);
> + if (!dc->desc->is_xlcdc)
> + sr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_CHSR);
>
> for (i = 0; i < state->nplanes; i++) {
> struct drm_gem_dma_object *gem = drm_fb_dma_get_gem_obj(fb, i);
>
> 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 +808,8 @@ 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)
> +void hlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)
> {
> - 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 +824,70 @@ static void atmel_hlcdc_plane_atomic_disable(struct drm_plane *p,
> atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_ISR);
> }
>
> +void xlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)
> +{
> + /* Disable interrupts */
> + atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_XLCDC_LAYER_IDR,
> + 0xffffffff);
> +
> + /* Disable the layer */
> + atmel_hlcdc_layer_write_reg(&plane->layer,
> + ATMEL_XLCDC_LAYER_ENR, 0);
> +
> + /* Clear all pending interrupts */
> + atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_XLCDC_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);
> +}
> +
> +void hlcdc_atomic_update(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_dc *dc)
> +{
> + 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));
> +}
> +
> +void xlcdc_atomic_update(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_dc *dc)
> +{
> + /* Enable the overrun interrupts. */
> + atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_XLCDC_LAYER_IER,
> + ATMEL_XLCDC_LAYER_OVR_IRQ(0) |
> + ATMEL_XLCDC_LAYER_OVR_IRQ(1) |
> + ATMEL_XLCDC_LAYER_OVR_IRQ(2));
> +
> + atmel_hlcdc_layer_write_reg(&plane->layer, ATMEL_XLCDC_LAYER_ENR,
> + ATMEL_XLCDC_LAYER_EN);
> +
> + /*
> + * Updating XLCDC_xxxCFGx, XLCDC_xxxFBA and XLCDC_xxxEN,
> + * (where xxx indicates each layer) requires writing one to the
> + * Update Attribute field for each layer in LCDC_ATTRE register for SAM9X7.
> + */
> + regmap_write(dc->hlcdc->regmap, ATMEL_XLCDC_ATTRE, ATMEL_XLCDC_BASE_UPDATE |
> + ATMEL_XLCDC_OVR1_UPDATE | ATMEL_XLCDC_OVR3_UPDATE |
> + ATMEL_XLCDC_HEO_UPDATE);
> +}
> +
> static void atmel_hlcdc_plane_atomic_update(struct drm_plane *p,
> struct drm_atomic_state *state)
> {
> @@ -739,7 +896,7 @@ 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 +907,63 @@ 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));
> +void hlcdc_csc_init(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc)
> +{
> + /*
> + * TODO: declare a "yuv-to-rgb-conv-factors" property to let
> + * userspace modify these factors (using a BLOB property ?).
> + */
> + static u32 hlcdc_csc_coeffs[] = {

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]);
> + }
> +}
> +
> +void xlcdc_csc_init(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc)
> +{
> + /*
> + * yuv-to-rgb-conv-factors are now defined from LCDC_HEOCFG16 to
> + * LCDC_HEOCFG21 registers in SAM9X7.
> + */
> + static u32 xlcdc_csc_coeffs[] = {

static const u32 xlcdc_csc_coeffs[] = {

> + 0x00000488,
> + 0x00000648,
> + 0x1EA00480,
> + 0x00001D28,
> + 0x08100480,
> + 0x00000000,
> + 0x00000007
> + };
> +
> + for (int i = 0; i < ARRAY_SIZE(xlcdc_csc_coeffs); i++) {
> + atmel_hlcdc_layer_write_cfg(&plane->layer,
> + desc->layout.csc + i,
> + xlcdc_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 +987,16 @@ 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)
> +void hlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc)
> {
> - 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
> @@ -830,8 +1006,31 @@ void atmel_hlcdc_plane_irq(struct atmel_hlcdc_plane *plane)
> if (isr &
> (ATMEL_HLCDC_LAYER_OVR_IRQ(0) | ATMEL_HLCDC_LAYER_OVR_IRQ(1) |
> ATMEL_HLCDC_LAYER_OVR_IRQ(2)))
> - dev_dbg(plane->base.dev->dev, "overrun on plane %s\n",
> - desc->name);
> + dev_warn(plane->base.dev->dev, "overrun on plane %s\n", desc->name);

why changed it to dev_warn() ?

> +}
> +
> +void xlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc)
> +{
> + u32 isr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_XLCDC_LAYER_ISR);
> +
> + /*
> + * There's not much we can do in case of overrun except informing
> + * the user. However, we are in interrupt context here, hence the
> + * use of dev_dbg().
> + */
> + if (isr &
> + (ATMEL_XLCDC_LAYER_OVR_IRQ(0) | ATMEL_XLCDC_LAYER_OVR_IRQ(1) |
> + ATMEL_XLCDC_LAYER_OVR_IRQ(2)))
> + dev_warn(plane->base.dev->dev, "overrun on plane %s\n", 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);
> }
>
> static const struct drm_plane_helper_funcs atmel_hlcdc_layer_plane_helper_funcs = {

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