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Date: Thu, 25 Jun 2020 12:58:11 +0530
From: kalyan_t@...eaurora.org
To: Rob Clark <robdclark@...il.com>
Cc: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
Krishna Manikandan <mkrishn@...eaurora.org>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
Raviteja Tamatam <travitej@...eaurora.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Douglas Anderson <dianders@...omium.org>,
nganji@...eaurora.org, Sean Paul <seanpaul@...omium.org>,
"Kristian H. Kristensen" <hoegsberg@...omium.org>,
freedreno <freedreno@...ts.freedesktop.org>
Subject: Re: [Freedreno] [PATCH] drm/msm/dpu: add support for dither block in
display
On 2020-06-25 01:55, Rob Clark wrote:
> On Wed, Jun 24, 2020 at 4:57 AM Kalyan Thota <kalyan_t@...eaurora.org>
> wrote:
>>
>> This change enables dither block for primary interface
>> in display.
>>
>> Enabled for 6bpc in the current version.
>>
>> Signed-off-by: Kalyan Thota <kalyan_t@...eaurora.org>
>> ---
>> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 45
>> +++++++++++++++++
>> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c | 66
>> +++++++++++++++++++++----
>> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h | 28 +++++++++++
>> 3 files changed, 130 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> index 63976dc..26e870a 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> @@ -208,6 +208,42 @@ struct dpu_encoder_virt {
>>
>> #define to_dpu_encoder_virt(x) container_of(x, struct
>> dpu_encoder_virt, base)
>>
>> +static u32 dither_matrix[DITHER_MATRIX_SZ] = {
>> + 15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
>> +};
>> +
>> +static void _dpu_encoder_setup_dither(struct dpu_encoder_phys *phys)
>> +{
>> + struct dpu_hw_dither_cfg dither_cfg = { 0 };
>> + struct drm_display_info *info;
>> +
>> + if (!phys || !phys->connector || !phys->hw_pp ||
>> + !phys->hw_pp->ops.setup_dither)
>> + return;
>
> it looks like other than phys->hw_pp->ops.setup_dither, you shouldn't
> need to check most of these conditions.
>
>> +
>> + info = &phys->connector->display_info;
>> + if (!info)
>
> and definitely not this one
>
>> + return;
>> +
>> + switch (phys->connector->display_info.bpc) {
>> + case 6:
>> + dither_cfg.c0_bitdepth = 6;
>> + dither_cfg.c1_bitdepth = 6;
>> + dither_cfg.c2_bitdepth = 6;
>> + dither_cfg.c3_bitdepth = 6;
>> + dither_cfg.temporal_en = 0;
>> + break;
>> + default:
>> + phys->hw_pp->ops.setup_dither(phys->hw_pp, NULL);
>> + return;
>> + }
>> +
>> + memcpy(&dither_cfg.matrix, dither_matrix,
>> + sizeof(u32) * DITHER_MATRIX_SZ);
>> +
>> + phys->hw_pp->ops.setup_dither(phys->hw_pp, &dither_cfg);
>> +}
>> +
>> void dpu_encoder_helper_report_irq_timeout(struct dpu_encoder_phys
>> *phys_enc,
>> enum dpu_intr_idx intr_idx)
>> {
>> @@ -1082,6 +1118,7 @@ static void
>> _dpu_encoder_virt_enable_helper(struct drm_encoder *drm_enc)
>> struct dpu_encoder_virt *dpu_enc = NULL;
>> struct msm_drm_private *priv;
>> struct dpu_kms *dpu_kms;
>> + int i;
>>
>> if (!drm_enc || !drm_enc->dev) {
>> DPU_ERROR("invalid parameters\n");
>> @@ -1104,6 +1141,14 @@ static void
>> _dpu_encoder_virt_enable_helper(struct drm_encoder *drm_enc)
>> dpu_kms->catalog);
>>
>> _dpu_encoder_update_vsync_source(dpu_enc,
>> &dpu_enc->disp_info);
>> +
>> + if (dpu_enc->disp_info.intf_type == DRM_MODE_ENCODER_DSI) {
>> + for (i = 0; i < dpu_enc->num_phys_encs; i++) {
>> + struct dpu_encoder_phys *phys =
>> dpu_enc->phys_encs[i];
>> +
>> + _dpu_encoder_setup_dither(phys);
>> + }
>> + }
>> }
>>
>> void dpu_encoder_virt_runtime_resume(struct drm_encoder *drm_enc)
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
>> index d110a40..cf7603d 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
>> @@ -28,6 +28,16 @@
>> #define PP_FBC_BUDGET_CTL 0x038
>> #define PP_FBC_LOSSY_MODE 0x03C
>>
>> +#define PP_DITHER_EN 0x000
>> +#define PP_DITHER_BITDEPTH 0x004
>> +#define PP_DITHER_MATRIX 0x008
>> +
>> +#define DITHER_DEPTH_MAP_INDEX 9
>> +
>> +static u32 dither_depth_map[DITHER_DEPTH_MAP_INDEX] = {
>> + 0, 0, 0, 0, 0, 0, 0, 1, 2
>> +};
>> +
>> static const struct dpu_pingpong_cfg *_pingpong_offset(enum
>> dpu_pingpong pp,
>> const struct dpu_mdss_cfg *m,
>> void __iomem *addr,
>> @@ -49,6 +59,40 @@ static const struct dpu_pingpong_cfg
>> *_pingpong_offset(enum dpu_pingpong pp,
>> return ERR_PTR(-EINVAL);
>> }
>>
>> +static void dpu_hw_pp_setup_dither(struct dpu_hw_pingpong *pp,
>> + struct dpu_hw_dither_cfg *cfg)
>> +{
>> + struct dpu_hw_blk_reg_map *c;
>> + u32 i, base, data = 0;
>> +
>> + if (!pp)
>> + return;
>
> can this ever be NULL.. at least currently you are checking this both
> here and in _dpu_encoder_setup_dither()
>
> BR,
> -R
>
Sure, will fix them. I guess got habituated to add checks so that static
code analyzers don't complain :-)
Kalyan
>> +
>> + c = &pp->hw;
>> + base = pp->caps->sblk->dither.base;
>> + if (!cfg) {
>> + DPU_REG_WRITE(c, base + PP_DITHER_EN, 0);
>> + return;
>> + }
>> +
>> + data = dither_depth_map[cfg->c0_bitdepth] & REG_MASK(2);
>> + data |= (dither_depth_map[cfg->c1_bitdepth] & REG_MASK(2)) <<
>> 2;
>> + data |= (dither_depth_map[cfg->c2_bitdepth] & REG_MASK(2)) <<
>> 4;
>> + data |= (dither_depth_map[cfg->c3_bitdepth] & REG_MASK(2)) <<
>> 6;
>> + data |= (cfg->temporal_en) ? (1 << 8) : 0;
>> +
>> + DPU_REG_WRITE(c, base + PP_DITHER_BITDEPTH, data);
>> +
>> + for (i = 0; i < DITHER_MATRIX_SZ - 3; i += 4) {
>> + data = (cfg->matrix[i] & REG_MASK(4)) |
>> + ((cfg->matrix[i + 1] & REG_MASK(4)) << 4) |
>> + ((cfg->matrix[i + 2] & REG_MASK(4)) << 8) |
>> + ((cfg->matrix[i + 3] & REG_MASK(4)) << 12);
>> + DPU_REG_WRITE(c, base + PP_DITHER_MATRIX + i, data);
>> + }
>> + DPU_REG_WRITE(c, base + PP_DITHER_EN, 1);
>> +}
>> +
>> static int dpu_hw_pp_setup_te_config(struct dpu_hw_pingpong *pp,
>> struct dpu_hw_tear_check *te)
>> {
>> @@ -180,15 +224,19 @@ static u32 dpu_hw_pp_get_line_count(struct
>> dpu_hw_pingpong *pp)
>> return line;
>> }
>>
>> -static void _setup_pingpong_ops(struct dpu_hw_pingpong_ops *ops,
>> - const struct dpu_pingpong_cfg *hw_cap)
>> +static void _setup_pingpong_ops(struct dpu_hw_pingpong *c,
>> + unsigned long features)
>> {
>> - ops->setup_tearcheck = dpu_hw_pp_setup_te_config;
>> - ops->enable_tearcheck = dpu_hw_pp_enable_te;
>> - ops->connect_external_te = dpu_hw_pp_connect_external_te;
>> - ops->get_vsync_info = dpu_hw_pp_get_vsync_info;
>> - ops->poll_timeout_wr_ptr = dpu_hw_pp_poll_timeout_wr_ptr;
>> - ops->get_line_count = dpu_hw_pp_get_line_count;
>> + c->ops.setup_tearcheck = dpu_hw_pp_setup_te_config;
>> + c->ops.enable_tearcheck = dpu_hw_pp_enable_te;
>> + c->ops.connect_external_te = dpu_hw_pp_connect_external_te;
>> + c->ops.get_vsync_info = dpu_hw_pp_get_vsync_info;
>> + c->ops.poll_timeout_wr_ptr = dpu_hw_pp_poll_timeout_wr_ptr;
>> + c->ops.get_line_count = dpu_hw_pp_get_line_count;
>> +
>> + if (test_bit(DPU_PINGPONG_DITHER, &features) &&
>> + IS_SC7180_TARGET(c->hw.hwversion))
>> + c->ops.setup_dither = dpu_hw_pp_setup_dither;
>> };
>>
>> static struct dpu_hw_blk_ops dpu_hw_ops;
>> @@ -212,7 +260,7 @@ struct dpu_hw_pingpong *dpu_hw_pingpong_init(enum
>> dpu_pingpong idx,
>>
>> c->idx = idx;
>> c->caps = cfg;
>> - _setup_pingpong_ops(&c->ops, c->caps);
>> + _setup_pingpong_ops(c, c->caps->features);
>>
>> dpu_hw_blk_init(&c->base, DPU_HW_BLK_PINGPONG, idx,
>> &dpu_hw_ops);
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h
>> index d73cb73..065996b 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h
>> @@ -10,6 +10,8 @@
>> #include "dpu_hw_util.h"
>> #include "dpu_hw_blk.h"
>>
>> +#define DITHER_MATRIX_SZ 16
>> +
>> struct dpu_hw_pingpong;
>>
>> struct dpu_hw_tear_check {
>> @@ -35,6 +37,26 @@ struct dpu_hw_pp_vsync_info {
>> };
>>
>> /**
>> + * struct dpu_hw_dither_cfg - dither feature structure
>> + * @flags: for customizing operations
>> + * @temporal_en: temperal dither enable
>> + * @c0_bitdepth: c0 component bit depth
>> + * @c1_bitdepth: c1 component bit depth
>> + * @c2_bitdepth: c2 component bit depth
>> + * @c3_bitdepth: c2 component bit depth
>> + * @matrix: dither strength matrix
>> + */
>> +struct dpu_hw_dither_cfg {
>> + u64 flags;
>> + u32 temporal_en;
>> + u32 c0_bitdepth;
>> + u32 c1_bitdepth;
>> + u32 c2_bitdepth;
>> + u32 c3_bitdepth;
>> + u32 matrix[DITHER_MATRIX_SZ];
>> +};
>> +
>> +/**
>> *
>> * struct dpu_hw_pingpong_ops : Interface to the pingpong Hw driver
>> functions
>> * Assumption is these functions will be called after clocks are
>> enabled
>> @@ -82,6 +104,12 @@ struct dpu_hw_pingpong_ops {
>> * Obtain current vertical line counter
>> */
>> u32 (*get_line_count)(struct dpu_hw_pingpong *pp);
>> +
>> + /**
>> + * Setup dither matix for pingpong block
>> + */
>> + void (*setup_dither)(struct dpu_hw_pingpong *pp,
>> + struct dpu_hw_dither_cfg *cfg);
>> };
>>
>> struct dpu_hw_pingpong {
>> --
>> 1.9.1
>>
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