Re: [V2][PATCH 1/2] drm: xlnx: add is_layer_vid() to simplify the code

From: Laurent Pinchart
Date: Thu May 20 2021 - 05:39:28 EST

Hi Quanyang,

Thank you for the patch.

On Tue, May 18, 2021 at 05:50:18PM +0800, quanyang.wang@xxxxxxxxxxxxx wrote:
> From: Quanyang Wang <quanyang.wang@xxxxxxxxxxxxx>
>
> Add a new function is_layer_vid() to simplify the code that
> judges if a layer is the video layer.

I like this, and especially passing the layer pointer to functions
instead of the layer ID. I'm however wondering is we shouldn't name the
function xlnx_zynqmp_disp_layer_is_video(), for consistency. If that's
fine with you I can make the change when applying the patch to my tree,
there's no need to submit a new version.

> Acked-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> Signed-off-by: Quanyang Wang <quanyang.wang@xxxxxxxxxxxxx>

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

> ---
> drivers/gpu/drm/xlnx/zynqmp_disp.c | 39 +++++++++++++++++-------------
> 1 file changed, 22 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> index 109d627968ac..eefb278e24c6 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> @@ -434,30 +434,35 @@ static void zynqmp_disp_avbuf_write(struct zynqmp_disp_avbuf *avbuf,
> writel(val, avbuf->base + reg);
> }
>
> +static bool is_layer_vid(const struct zynqmp_disp_layer *layer)
> +{
> + return layer->id == ZYNQMP_DISP_LAYER_VID;
> +}
> +
> /**
> * zynqmp_disp_avbuf_set_format - Set the input format for a layer
> * @avbuf: Audio/video buffer manager
> - * @layer: The layer ID
> + * @layer: The layer
> * @fmt: The format information
> *
> * Set the video buffer manager format for @layer to @fmt.
> */
> static void zynqmp_disp_avbuf_set_format(struct zynqmp_disp_avbuf *avbuf,
> - enum zynqmp_disp_layer_id layer,
> + struct zynqmp_disp_layer *layer,
> const struct zynqmp_disp_format *fmt)
> {
> unsigned int i;
> u32 val;
>
> val = zynqmp_disp_avbuf_read(avbuf, ZYNQMP_DISP_AV_BUF_FMT);
> - val &= layer == ZYNQMP_DISP_LAYER_VID
> + val &= is_layer_vid(layer)
> ? ~ZYNQMP_DISP_AV_BUF_FMT_NL_VID_MASK
> : ~ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_MASK;
> val |= fmt->buf_fmt;
> zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_FMT, val);
>
> for (i = 0; i < ZYNQMP_DISP_AV_BUF_NUM_SF; i++) {
> - unsigned int reg = layer == ZYNQMP_DISP_LAYER_VID
> + unsigned int reg = is_layer_vid(layer)
> ? ZYNQMP_DISP_AV_BUF_VID_COMP_SF(i)
> : ZYNQMP_DISP_AV_BUF_GFX_COMP_SF(i);
>
> @@ -573,19 +578,19 @@ static void zynqmp_disp_avbuf_disable_audio(struct zynqmp_disp_avbuf *avbuf)
> /**
> * zynqmp_disp_avbuf_enable_video - Enable a video layer
> * @avbuf: Audio/video buffer manager
> - * @layer: The layer ID
> + * @layer: The layer
> * @mode: Operating mode of layer
> *
> * Enable the video/graphics buffer for @layer.
> */
> static void zynqmp_disp_avbuf_enable_video(struct zynqmp_disp_avbuf *avbuf,
> - enum zynqmp_disp_layer_id layer,
> + struct zynqmp_disp_layer *layer,
> enum zynqmp_disp_layer_mode mode)
> {
> u32 val;
>
> val = zynqmp_disp_avbuf_read(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT);
> - if (layer == ZYNQMP_DISP_LAYER_VID) {
> + if (is_layer_vid(layer)) {
> val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_MASK;
> if (mode == ZYNQMP_DISP_LAYER_NONLIVE)
> val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_MEM;
> @@ -605,17 +610,17 @@ static void zynqmp_disp_avbuf_enable_video(struct zynqmp_disp_avbuf *avbuf,
> /**
> * zynqmp_disp_avbuf_disable_video - Disable a video layer
> * @avbuf: Audio/video buffer manager
> - * @layer: The layer ID
> + * @layer: The layer
> *
> * Disable the video/graphics buffer for @layer.
> */
> static void zynqmp_disp_avbuf_disable_video(struct zynqmp_disp_avbuf *avbuf,
> - enum zynqmp_disp_layer_id layer)
> + struct zynqmp_disp_layer *layer)
> {
> u32 val;
>
> val = zynqmp_disp_avbuf_read(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT);
> - if (layer == ZYNQMP_DISP_LAYER_VID) {
> + if (is_layer_vid(layer)) {
> val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_MASK;
> val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_NONE;
> } else {
> @@ -807,7 +812,7 @@ static void zynqmp_disp_blend_layer_set_csc(struct zynqmp_disp_blend *blend,
> }
> }
>
> - if (layer->id == ZYNQMP_DISP_LAYER_VID)
> + if (is_layer_vid(layer))
> reg = ZYNQMP_DISP_V_BLEND_IN1CSC_COEFF(0);
> else
> reg = ZYNQMP_DISP_V_BLEND_IN2CSC_COEFF(0);
> @@ -818,7 +823,7 @@ static void zynqmp_disp_blend_layer_set_csc(struct zynqmp_disp_blend *blend,
> zynqmp_disp_blend_write(blend, reg + 8, coeffs[i + swap[2]]);
> }
>
> - if (layer->id == ZYNQMP_DISP_LAYER_VID)
> + if (is_layer_vid(layer))
> reg = ZYNQMP_DISP_V_BLEND_IN1CSC_OFFSET(0);
> else
> reg = ZYNQMP_DISP_V_BLEND_IN2CSC_OFFSET(0);
> @@ -1025,7 +1030,7 @@ zynqmp_disp_layer_find_format(struct zynqmp_disp_layer *layer,
> */
> static void zynqmp_disp_layer_enable(struct zynqmp_disp_layer *layer)
> {
> - zynqmp_disp_avbuf_enable_video(&layer->disp->avbuf, layer->id,
> + zynqmp_disp_avbuf_enable_video(&layer->disp->avbuf, layer,
> ZYNQMP_DISP_LAYER_NONLIVE);
> zynqmp_disp_blend_layer_enable(&layer->disp->blend, layer);
>
> @@ -1046,7 +1051,7 @@ static void zynqmp_disp_layer_disable(struct zynqmp_disp_layer *layer)
> for (i = 0; i < layer->drm_fmt->num_planes; i++)
> dmaengine_terminate_sync(layer->dmas[i].chan);
>
> - zynqmp_disp_avbuf_disable_video(&layer->disp->avbuf, layer->id);
> + zynqmp_disp_avbuf_disable_video(&layer->disp->avbuf, layer);
> zynqmp_disp_blend_layer_disable(&layer->disp->blend, layer);
> }
>
> @@ -1067,7 +1072,7 @@ static void zynqmp_disp_layer_set_format(struct zynqmp_disp_layer *layer,
> layer->disp_fmt = zynqmp_disp_layer_find_format(layer, info->format);
> layer->drm_fmt = info;
>
> - zynqmp_disp_avbuf_set_format(&layer->disp->avbuf, layer->id,
> + zynqmp_disp_avbuf_set_format(&layer->disp->avbuf, layer,
> layer->disp_fmt);
>
> /*
> @@ -1244,8 +1249,8 @@ static int zynqmp_disp_create_planes(struct zynqmp_disp *disp)
> drm_formats[j] = layer->info->formats[j].drm_fmt;
>
> /* Graphics layer is primary, and video layer is overlay. */
> - type = i == ZYNQMP_DISP_LAYER_GFX
> - ? DRM_PLANE_TYPE_PRIMARY : DRM_PLANE_TYPE_OVERLAY;
> + type = is_layer_vid(layer)
> + ? DRM_PLANE_TYPE_OVERLAY : DRM_PLANE_TYPE_PRIMARY;
> ret = drm_universal_plane_init(disp->drm, &layer->plane, 0,
> &zynqmp_disp_plane_funcs,
> drm_formats,

--
Regards,

Laurent Pinchart