Re: [PATCH v4 5/8] drm: atmel_hlcdc: Add support for XLCDC in atmel LCD driver

From: Manikandan.M
Date: Tue Sep 12 2023 - 06:46:02 EST

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In reply to: claudiu beznea: "Re: [PATCH v4 5/8] drm: atmel_hlcdc: Add support for XLCDC in atmel LCD driver"
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On 09/09/23 9:50 pm, claudiu beznea wrote:
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>
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>
> Hi, Manikandan,
>
> On 8/25/23 15:54, 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.
>> - 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 <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 | 25 +-
>> .../gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 333 +++++++++++++++---
>> 2 files changed, 299 insertions(+), 59 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..4b11a1de8af4 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 +203,16 @@ 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);
>> + regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
>> + !(status & ATMEL_XLCDC_CM), 10, 0);
>
> You may want to check the return value of regmap_read_poll_timeout().
> Otherwise your setup may fail.
>
> Also, regmap_read_poll_timeout() may sleep, the other settings in this
> functions are done with bussy looping, is there a reason for that?
>Hi Claudiu

Not sure if a non-zero timeout_us coud be sufficient for this operation,
considering the next power-up and power-down sequence following the
current step.
Any suggestion on the value of timeout_us is appreciable.
>> +
>> + regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_XLCDC_SD);
>> + regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
>> + status & ATMEL_XLCDC_SD, 10, 0);
>
> Same here.
>
>> + }
>> +
>> regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
>> while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
>> (status & ATMEL_HLCDC_DISP))
>> @@ -256,6 +267,16 @@ 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);
>> + regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
>> + status & ATMEL_XLCDC_CM, 10, 0);
>> +
>> + regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_XLCDC_SD);
>> + regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
>> + !(status & ATMEL_XLCDC_SD), 10, 0);
>> + }
>> +
>> pm_runtime_put_sync(dev->dev);
>>
>> }
>> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
>> index daa508504f47..26caf4cddfa4 100644
>> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
>> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
>> @@ -330,11 +330,59 @@ static 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);
>
> Could ((1 << 20) * state->src_w) overflow?
It is within the limits, state->src_w will contain a 11bit reg value at max.
>
>> +
>> + /* yfactor = round[(2^20 * YMEMSIZE)/YSIZE)] */
>> + yfactor = (u32)(((1 << 20) * state->src_h) / state->crtc_h);
>
> Same here.
>
>> +
>> + 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) {
>> + atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.scaler_config + 2,
>> + yfactor / 2);
>> + atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.scaler_config + 4,
>> + xfactor / 2);
>> + } else {
>> + /* As per ARGB window resampling configuration */
>> + 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);
>> + }
>
> This can be written as follows:
> 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)
>> {
>> 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,
>> @@ -352,7 +400,10 @@ 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);
>> + if (dc->desc->is_xlcdc)
>> + atmel_xlcdc_plane_setup_scaler(plane, state);
>> + else
>> + atmel_hlcdc_plane_setup_scaler(plane, state);
>
> What if you embedd the plane_setup_scaller function in struct
> atmel_hlcdc_dc_desc and define per lcdc variant the proper function you can
> have here something like:
> dc->desc->plane_setup_scaler();
>
> This is valid for other places in this patch (see below).
Sure, I will try to incoperate this change.
>
>> }
>>
>> static void
>> @@ -393,6 +444,40 @@ 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)
>> +{
>> + unsigned int cfg;
>> + 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 +522,55 @@ static void atmel_hlcdc_plane_update_clut(struct atmel_hlcdc_plane *plane,
>> }
>> }
>>
>> +static 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)) {
>
> To avoid extra indenting:
> 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 update_xlcdc_buffers(struct atmel_hlcdc_plane *plane,
>> + struct atmel_hlcdc_plane_state *state, 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)
>
> update_hlcdc_buffers() and update_xlcdc_buffers() could also be members in
> the struct atmel_hlcdc_dc_desc and called accordingly where needed w/o
> checking is_xlcdc.
>
>> {
>> 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);
>> - }
>> + if (dc->desc->is_xlcdc)
>> + update_xlcdc_buffers(plane, state, i);
>> + else
>> + update_hlcdc_buffers(plane, state, sr, i);
>
> And here you can have something like:
> dc->desc->update_lcdc_buffers();
>>
>> if (desc->layout.xstride[i])
>> atmel_hlcdc_layer_write_cfg(&plane->layer,
>> @@ -712,11 +816,8 @@ 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)
>> {
>> - 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 +832,72 @@ static void atmel_hlcdc_plane_atomic_disable(struct drm_plane *p,
>> atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_ISR);
>> }
>>
>> +static 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;
>> +
>> + if (dc->desc->is_xlcdc)
>> + xlcdc_atomic_disable(plane);
>> + else
>> + hlcdc_atomic_disable(plane);
>
> dc->desc->lcdc_atomic_disable();
>
>> +}
>> +
>> +static void hlcdc_atomic_update(struct atmel_hlcdc_plane *plane)
>> +{
>> + 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 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 +906,7 @@ 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 +917,67 @@ 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);
>> + if (dc->desc->is_xlcdc)
>> + atmel_xlcdc_plane_update_general_settings(plane, hstate);
>> + else
>> + atmel_hlcdc_plane_update_general_settings(plane, hstate);
>
> dc->desc->lcdc_plane_update_general_settigns();
>
>> 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));
>> + if (dc->desc->is_xlcdc)
>> + xlcdc_atomic_update(plane, dc);
>> + else
>> + hlcdc_atomic_update(plane);
>
> dc->desc->lcdc_atomic_update();
>
>> +}
>>
>> - /* 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));
>> +u32 hlcdc_csc_coeffs[] = {
>> + 0x4c900091,
>> + 0x7a5f5090,
>> + 0x40040890
>> +};
>
> You can move this in function where it is used and declare it static.
>
>> +
>> +u32 xlcdc_csc_coeffs[] = {
>> + 0x00000488,
>> + 0x00000648,
>> + 0x1EA00480,
>> + 0x00001D28,
>> + 0x08100480,
>> + 0x00000000,
>> + 0x00000007
>> +};
>
> Same here.
>
>> +
>> +static 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 ?).
>> + */
>> + for (int i = 0; i < ARRAY_SIZE(hlcdc_csc_coeffs); i++)
>
> { at the end of for statement.
>
>> + atmel_hlcdc_layer_write_cfg(&plane->layer,
>> + desc->layout.csc + i,
>> + hlcdc_csc_coeffs[i]);
>
> } here
>
>> +}
>> +
>> +static 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.
>> + */
>> + 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]);
>
> Ditto
>
>> }
>>
>> 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 +1001,19 @@ 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 (dc->desc->is_xlcdc && desc->layout.csc)
>> + xlcdc_csc_init(plane, desc);
>> + else
>> + if (desc->layout.csc)
>> + hlcdc_csc_init(plane, desc);
>
> if (desc->layout.csc)
> dc->desc->lcdc_csc_init();
>
>>
>> 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)
>> {
>> - 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 +1023,34 @@ 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);
>> + pr_warn("%s: overrun on plane %s\n", __func__, desc->name);
>
> Why changing to pr_warn? why not dev_warn, if any?
>
>> +}
>> +
>> +static 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)))
>> + pr_warn("%s: overrun on plane %s\n", __func__, desc->name);
>
> dev_warn() ?
>
>> +}
>> +
>> +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;
>> +
>> + if (dc->desc->is_xlcdc)
>> + xlcdc_irq_dbg(plane, desc);
>> + else
>> + hlcdc_irq_dbg(plane, desc);
>
> dc->desc->lcdc_irq_dbg() ?
>
>> }
>>
>> static const struct drm_plane_helper_funcs atmel_hlcdc_layer_plane_helper_funcs = {

--
Thanks and Regards,
Manikandan M.

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