by claudiu beznea

[permalink] [raw]

Subject: Re: [PATCH v8 3/7] drm: atmel_hlcdc: Add support for XLCDC using IP specific driver ops

On 21.02.2024 07:35, Manikandan Muralidharan wrote:
> Add XLCDC specific driver ops and is_xlcdc flag to separate the
> functionality and to access the controller registers.
> 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.
>
> Signed-off-by: Manikandan Muralidharan <[email protected]>
> Co-developed-by: Hari Prasath Gujulan Elango <[email protected]>
> Signed-off-by: Hari Prasath Gujulan Elango <[email protected]>
> Co-developed-by: Durai Manickam KR <[email protected]>
> Signed-off-by: Durai Manickam KR <[email protected]>
> ---
> .../gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 81 +++++---
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h | 3 +
> .../gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 182 +++++++++++++++++-
> 3 files changed, 242 insertions(+), 24 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..98a98b5fca85 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> @@ -164,11 +164,13 @@ 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)
> - cfg |= ATMEL_HLCDC_VSPOL;
> + if (!crtc->dc->desc->is_xlcdc) {
> + if (adj->flags & DRM_MODE_FLAG_NVSYNC)
> + cfg |= ATMEL_HLCDC_VSPOL;
>
> - if (adj->flags & DRM_MODE_FLAG_NHSYNC)
> - cfg |= ATMEL_HLCDC_HSPOL;
> + if (adj->flags & DRM_MODE_FLAG_NHSYNC)
> + cfg |= ATMEL_HLCDC_HSPOL;
> + }
>
> regmap_update_bits(regmap, ATMEL_HLCDC_CFG(5),
> ATMEL_HLCDC_HSPOL | ATMEL_HLCDC_VSPOL |
> @@ -202,20 +204,37 @@ 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))
> - cpu_relax();
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + !(status & ATMEL_HLCDC_DISP),
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register DISPSTS timeout\n");

This is different thing than what the commit states it does but if
maintainer wants to keep it like this I don't have anything against. Valid
for the rest of regmap_read_poll_timeout() additions.

>
> regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
> - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> - (status & ATMEL_HLCDC_SYNC))
> - cpu_relax();
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + !(status & ATMEL_HLCDC_SYNC),
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register LCDSTS timeout\n");
>
> regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
> - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> - (status & ATMEL_HLCDC_PIXEL_CLK))
> - cpu_relax();
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + !(status & ATMEL_HLCDC_PIXEL_CLK),
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register CLKSTS timeout\n");
>
> clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
> pinctrl_pm_select_sleep_state(dev->dev);
> @@ -241,20 +260,36 @@ static void atmel_hlcdc_crtc_atomic_enable(struct drm_crtc *c,
> clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
>
> regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
> - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> - !(status & ATMEL_HLCDC_PIXEL_CLK))
> - cpu_relax();
> -
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + status & ATMEL_HLCDC_PIXEL_CLK,
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register CLKSTS timeout\n");
>
> regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
> - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> - !(status & ATMEL_HLCDC_SYNC))
> - cpu_relax();
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + status & ATMEL_HLCDC_SYNC,
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register LCDSTS timeout\n");
>
> regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
> - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> - !(status & ATMEL_HLCDC_DISP))
> - cpu_relax();
> + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
> + status & ATMEL_HLCDC_DISP,
> + 10, 1000))
> + dev_warn(dev->dev, "Atmel LCDC status register DISPSTS timeout\n");
> +
> + 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.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> index bc70a81b5275..777987b7873d 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> @@ -387,6 +387,7 @@ struct atmel_lcdc_dc_ops {
> };
>
> extern const struct atmel_lcdc_dc_ops atmel_hlcdc_ops;
> +extern const struct atmel_lcdc_dc_ops atmel_xlcdc_ops;
>
> /**
> * Atmel HLCDC Display Controller description structure.
> @@ -404,6 +405,7 @@ extern const struct atmel_lcdc_dc_ops atmel_hlcdc_ops;
> * @conflicting_output_formats: true if RGBXXX output formats conflict with
> * each other.
> * @fixed_clksrc: true if clock source is fixed
> + * @is_xlcdc: true if XLCDC IP is supported
> * @layers: a layer description table describing available layers
> * @nlayers: layer description table size
> * @ops: atmel lcdc dc ops
> @@ -418,6 +420,7 @@ struct atmel_hlcdc_dc_desc {
> int max_hpw;
> bool conflicting_output_formats;
> bool fixed_clksrc;
> + bool is_xlcdc;
> const struct atmel_hlcdc_layer_desc *layers;
> int nlayers;
> const struct atmel_lcdc_dc_ops *ops;
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> index 3427546cd58c..59ddd743ce92 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -331,6 +331,55 @@ void atmel_hlcdc_plane_setup_scaler(struct atmel_hlcdc_plane *plane,
> yfactor));
> }
>
> +static
> +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);
> +
> + /*
> + * With YCbCr 4:2:2 and YCbYcr 4:2:0 window resampling, configuration
> + * register LCDC_HEOCFG25.VXSCFACT and LCDC_HEOCFG27.HXSCFACT is half
> + * the value of yfactor and xfactor.
> + */
> + if (state->base.fb->format->format == DRM_FORMAT_YUV420) {
> + yfactor /= 2;
> + xfactor /= 2;
> + }
> +
> + 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)
> @@ -395,6 +444,40 @@ void atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> cfg);
> }
>
> +static
> +void atmel_xlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state)
> +{
> + const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
> + const struct drm_format_info *format = state->base.fb->format;
> + unsigned int cfg;
> +
> + 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)
> {
> @@ -461,6 +544,15 @@ static void update_hlcdc_buffers(struct atmel_hlcdc_plane *plane,
> state->dscrs[i]->self);
> }
>
> +static void update_xlcdc_buffers(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_plane_state *state,
> + u32 sr, int i)

*atmel*_update_xlcdc_buffers()

> +{
> + 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)
> {
> @@ -470,7 +562,8 @@ static void atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
> 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);
> @@ -739,6 +832,20 @@ static void hlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)
> atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_ISR);
> }
>
> +static void xlcdc_atomic_disable(struct atmel_hlcdc_plane *plane)

Same here: *atmel*_xlcdc_atomic_disable()

> +{
> + /* 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)
> {
> @@ -767,6 +874,28 @@ static void hlcdc_atomic_update(struct atmel_hlcdc_plane *plane,
> ATMEL_HLCDC_LAYER_A2Q : ATMEL_HLCDC_LAYER_EN));
> }
>
> +static void xlcdc_atomic_update(struct atmel_hlcdc_plane *plane,
> + struct atmel_hlcdc_dc *dc)

*atmel*_xlcdc_atomic_update()

> +{
> + /* 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)
> {
> @@ -815,6 +944,30 @@ static void hlcdc_csc_init(struct atmel_hlcdc_plane *plane,
> }
> }
>
> +static void xlcdc_csc_init(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc)

*atmel*_xlcdc_csc_init()

> +{
> + /*
> + * yuv-to-rgb-conv-factors are now defined from LCDC_HEOCFG16 to
> + * LCDC_HEOCFG21 registers in SAM9X7.
> + */
> + 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;
> @@ -865,6 +1018,23 @@ static void hlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
> desc->name);
> }
>
> +static void xlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
> + const struct atmel_hlcdc_layer_desc *desc)

*atmel*_xlcdc_irq_dbg()

> +{
> + 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_dbg(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;
> @@ -883,6 +1053,16 @@ const struct atmel_lcdc_dc_ops atmel_hlcdc_ops = {
> .lcdc_irq_dbg = hlcdc_irq_dbg,
> };
>
> +const struct atmel_lcdc_dc_ops atmel_xlcdc_ops = {
> + .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 drm_plane_helper_funcs atmel_hlcdc_layer_plane_helper_funcs = {
> .atomic_check = atmel_hlcdc_plane_atomic_check,
> .atomic_update = atmel_hlcdc_plane_atomic_update,

2024-02-24 12:52:26

by claudiu beznea

[permalink] [raw]

Subject: Re: [PATCH v8 0/7] Add support for XLCDC to sam9x7 SoC family.

Hi, Manikandan,

On 21.02.2024 07:35, Manikandan Muralidharan wrote:
> This patch series aims to add support for XLCDC IP of sam9x7 SoC family
> to the DRM subsystem.XLCDC IP has additional registers and new
> configuration bits compared to the existing register set of HLCDC IP.
> The new compatible string "microchip,sam9x75-xlcdc" is defined for sam9x75
> variant of the sam9x7 SoC family.The is_xlcdc flag under driver data and
> IP specific driver ops helps to differentiate the XLCDC and existing HLCDC
> code within the same driver.
>
> changes in v8:
> * Re-arrange the patch set to prepare and update the current HLCDC
> code base with the new LCDC IP based driver ops and then add support
> for XLCDC code changes.
> * Fix Cosmetic issues.
>
> changes in v7:
> * LCDC IP driver ops functions are declared static and its
> declaration are removed.
>
> changes in v6:
> * Fixed Cosmetic defects.
> * Added comments for readability.
>
> changes in v5:
> * return value of regmap_read_poll_timeout is checked in failure
> case.
> * HLCDC and XLCDC specific driver functions are now invoked
> using its IP specific driver ops w/o the need of checking is_xlcdc flag.
> * Removed empty spaces and blank lines.
>
> changes in v4:
> * fixed kernel warnings reported by kernel test robot.
>
> changes in v3:
> * Removed de-referencing the value of is_xlcdc flag multiple times in
> a single function.
> * Removed cpu_relax() call when using regmap_read_poll_timeout.
> * Updated xfactor and yfactor equations using shift operators
> * Defined CSC co-efficients in an array for code readability.
>
> changes in v2:
> * Change the driver compatible name from "microchip,sam9x7-xlcdc" to
> "microchip,sam9x75-xlcdc".
> * Move is_xlcdc flag to driver data.
> * Remove unsed Macro definitions.
> * Add co-developed-bys tags
> * Replace regmap_read() with regmap_read_poll_timeout() call
> * Split code into two helpers for code readablitity.
> ---
>
> Durai Manickam KR (1):
> drm: atmel-hlcdc: Define XLCDC specific registers
>
> Manikandan Muralidharan (6):
> drm: atmel-hlcdc: add driver ops to differentiate HLCDC and XLCDC IP
> drm: atmel_hlcdc: Add support for XLCDC using IP specific driver ops
> drm: atmel-hlcdc: add DPI mode support for XLCDC
> drm: atmel-hlcdc: add vertical and horizontal scaling support for
> XLCDC
> drm: atmel-hlcdc: add support for DSI output formats
> drm: atmel-hlcdc: add LCD controller layer definition for sam9x75
>

Only minor comments from me (check individual patches). W/ or w/o those
addressed you can add:

Reviewed-by: Claudiu Beznea <[email protected]>