> -----Original Message-----
> From: dri-devel <dri-devel-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of
> Arun R Murthy
> Sent: Tuesday, December 3, 2024 11:25 AM
> To: intel-xe@xxxxxxxxxxxxxxxxxxxxx; intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-
> devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Murthy, Arun R <arun.r.murthy@xxxxxxxxx>
> Subject: [PATCHv6 09/10] drm/i915/histogram: Histogram changes for Display
> 20+
>
> In Display 20+, new registers are added for setting index, reading histogram
> and writing the IET.
>
> v2: Removed duplicate code (Jani)
> v3: Moved histogram core changes to earlier patches (Jani/Suraj)
> v4: Rebased after addressing comments on patch 1
> v5: Added the retry logic from patch3 and rebased the patch series
> v6: optimize wite_iet() (Suraj)
>
> Bspec: 68895
> Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
LGTM,
Reviewed-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
> ---
> .../gpu/drm/i915/display/intel_histogram.c | 105 +++++++++++++-----
> .../drm/i915/display/intel_histogram_regs.h | 25 +++++
> 2 files changed, 103 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c
> b/drivers/gpu/drm/i915/display/intel_histogram.c
> index 66006b75efaa..48495480107e 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.c
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.c
> @@ -29,6 +29,37 @@ struct intel_histogram {
> u32 bin_data[HISTOGRAM_BIN_COUNT];
> };
>
> +static void set_bin_index_0(struct intel_display *display, enum pipe
> +pipe) {
> + if (DISPLAY_VER(display) >= 20)
> + intel_de_rmw(display, DPST_IE_INDEX(pipe),
> + DPST_IE_BIN_INDEX_MASK,
> DPST_IE_BIN_INDEX(0));
> + else
> + intel_de_rmw(display, DPST_CTL(pipe),
> + DPST_CTL_BIN_REG_MASK,
> + DPST_CTL_BIN_REG_CLEAR);
> +}
> +
> +static void write_iet(struct intel_display *display, enum pipe pipe,
> + u32 *data)
> +{
> + int i;
> +
> + for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
> + if (DISPLAY_VER(display) >= 20)
> + intel_de_rmw(display, DPST_IE_BIN(pipe),
> + DPST_IE_BIN_DATA_MASK,
> + DPST_IE_BIN_DATA(data[i]));
> + else
> + intel_de_rmw(display, DPST_BIN(pipe),
> + DPST_BIN_DATA_MASK,
> + DPST_BIN_DATA(data[i]));
> +
> + drm_dbg_atomic(display->drm, "iet_lut[%d]=%x\n",
> + i, data[i]);
> + }
> +}
> +
> static bool intel_histogram_get_data(struct intel_crtc *intel_crtc) {
> struct intel_display *display = to_intel_display(intel_crtc); @@ -36,12
> +67,27 @@ static bool intel_histogram_get_data(struct intel_crtc *intel_crtc)
> int index;
> u32 dpstbin;
>
> + if (DISPLAY_VER(display) >= 20)
> + intel_de_rmw(display, DPST_HIST_INDEX(intel_crtc->pipe),
> + DPST_HIST_BIN_INDEX_MASK,
> + DPST_HIST_BIN_INDEX(0));
> + else
> + intel_de_rmw(display, DPST_CTL(intel_crtc->pipe),
> + DPST_CTL_BIN_REG_FUNC_SEL |
> DPST_CTL_BIN_REG_MASK, 0);
> +
> for (index = 0; index < ARRAY_SIZE(histogram->bin_data); index++) {
> - dpstbin = intel_de_read(display, DPST_BIN(intel_crtc->pipe));
> + dpstbin = intel_de_read(display, (DISPLAY_VER(display) >= 20
> ?
> + DPST_HIST_BIN(intel_crtc->pipe) :
> + DPST_BIN(intel_crtc->pipe)));
> if (!(dpstbin & DPST_BIN_BUSY)) {
> - histogram->bin_data[index] = dpstbin &
> DPST_BIN_DATA_MASK;
> - } else
> + histogram->bin_data[index] = dpstbin &
> (DISPLAY_VER(display) >= 20 ?
> +
> DPST_HIST_BIN_DATA_MASK :
> +
> DPST_BIN_DATA_MASK);
> + } else {
> + drm_err(display->drm, "Histogram bin busy,
> retyring\n");
> + fsleep(2);
> return false;
> + }
> }
> return true;
> }
> @@ -69,8 +115,6 @@ static void intel_histogram_handle_int_work(struct
> work_struct *work)
> * Set DPST_CTL Bin Reg function select to TC
> * Set DPST_CTL Bin Register Index to 0
> */
> - intel_de_rmw(display, DPST_CTL(intel_crtc->pipe),
> - DPST_CTL_BIN_REG_FUNC_SEL |
> DPST_CTL_BIN_REG_MASK, 0);
> for (retry = 0; retry < HISTOGRAM_BIN_READ_RETRY_COUNT; retry++)
> {
> if (intel_histogram_get_data(intel_crtc)) {
> u32 *data;
> @@ -165,15 +209,26 @@ static int intel_histogram_enable(struct intel_crtc
> *intel_crtc)
> if (histogram->enable)
> return 0;
>
> - /* enable histogram, clear DPST_CTL bin reg func select to TC */
> - intel_de_rmw(display, DPST_CTL(pipe),
> - DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_IE_HIST_EN |
> - DPST_CTL_HIST_MODE |
> DPST_CTL_IE_TABLE_VALUE_FORMAT |
> - DPST_CTL_ENHANCEMENT_MODE_MASK |
> DPST_CTL_IE_MODI_TABLE_EN,
> - DPST_CTL_BIN_REG_FUNC_TC | DPST_CTL_IE_HIST_EN |
> - DPST_CTL_HIST_MODE_HSV |
> - DPST_CTL_IE_TABLE_VALUE_FORMAT_1INT_9FRAC |
> - DPST_CTL_EN_MULTIPLICATIVE |
> DPST_CTL_IE_MODI_TABLE_EN);
> + /* enable histogram, clear DPST_BIN reg and select TC function */
> + if (DISPLAY_VER(display) >= 20)
> + intel_de_rmw(display, DPST_CTL(pipe),
> + DPST_CTL_IE_HIST_EN |
> + DPST_CTL_HIST_MODE,
> + DPST_CTL_IE_HIST_EN |
> + DPST_CTL_HIST_MODE_HSV);
> + else
> + /* enable histogram, clear DPST_BIN reg and select TC
> function */
> + intel_de_rmw(display, DPST_CTL(pipe),
> + DPST_CTL_BIN_REG_FUNC_SEL |
> DPST_CTL_IE_HIST_EN |
> + DPST_CTL_HIST_MODE |
> + DPST_CTL_IE_TABLE_VALUE_FORMAT |
> + DPST_CTL_ENHANCEMENT_MODE_MASK |
> + DPST_CTL_IE_MODI_TABLE_EN,
> + DPST_CTL_BIN_REG_FUNC_TC |
> DPST_CTL_IE_HIST_EN |
> + DPST_CTL_HIST_MODE_HSV |
> + DPST_CTL_IE_TABLE_VALUE_FORMAT_1INT_9FRAC
> |
> + DPST_CTL_EN_MULTIPLICATIVE |
> + DPST_CTL_IE_MODI_TABLE_EN);
>
> /* Re-Visit: check if wait for one vblank is required */
> drm_crtc_wait_one_vblank(&intel_crtc->base);
> @@ -242,7 +297,6 @@ int intel_histogram_set_iet_lut(struct intel_crtc
> *intel_crtc,
> struct intel_histogram *histogram = intel_crtc->histogram;
> struct intel_display *display = to_intel_display(intel_crtc);
> int pipe = intel_crtc->pipe;
> - int i = 0;
> struct drm_histogram *hist;
> u32 *data;
> int ret;
> @@ -260,15 +314,15 @@ int intel_histogram_set_iet_lut(struct intel_crtc
> *intel_crtc,
> return -EINVAL;
> }
>
> - /* Set DPST_CTL Bin Reg function select to IE & wait for a vblabk */
> - intel_de_rmw(display, DPST_CTL(pipe),
> - DPST_CTL_BIN_REG_FUNC_SEL,
> DPST_CTL_BIN_REG_FUNC_IE);
>
> - drm_crtc_wait_one_vblank(&intel_crtc->base);
> + if (DISPLAY_VER(display) < 20) {
> + /* Set DPST_CTL Bin Reg function select to IE & wait for a
> vblabk */
> + intel_de_rmw(display, DPST_CTL(pipe),
> + DPST_CTL_BIN_REG_FUNC_SEL,
> + DPST_CTL_BIN_REG_FUNC_IE);
> + }
>
> - /* Set DPST_CTL Bin Register Index to 0 */
> - intel_de_rmw(display, DPST_CTL(pipe),
> - DPST_CTL_BIN_REG_MASK, DPST_CTL_BIN_REG_CLEAR);
> + set_bin_index_0(display, pipe);
>
> hist = (struct drm_histogram *)blob->data;
> data = kzalloc(sizeof(data) * hist->nr_elements, GFP_KERNEL); @@ -
> 279,11 +333,8 @@ int intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc,
> if (ret)
> return ret;
>
> - for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
> - intel_de_rmw(display, DPST_BIN(pipe),
> - DPST_BIN_DATA_MASK, data[i]);
> - drm_dbg_atomic(display->drm, "iet_lut[%d]=%x\n", i,
> data[i]);
> - }
> + write_iet(display, pipe, data);
> +
> kfree(data);
> drm_property_blob_put(intel_crtc->base.state->histogram_iet);
>
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram_regs.h
> b/drivers/gpu/drm/i915/display/intel_histogram_regs.h
> index 213c9f483567..3fbb9c2deaae 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram_regs.h
> +++ b/drivers/gpu/drm/i915/display/intel_histogram_regs.h
> @@ -45,6 +45,31 @@
> #define _DPST_BIN_B 0x491C4
> #define DPST_BIN(pipe)
> _MMIO_PIPE(pipe, _DPST_BIN_A, _DPST_BIN_B)
> #define DPST_BIN_DATA_MASK
> REG_GENMASK(23, 0)
> +#define DPST_BIN_DATA(val)
> REG_FIELD_PREP(DPST_BIN_DATA_MASK, val)
> #define DPST_BIN_BUSY REG_BIT(31)
>
> +#define _DPST_HIST_INDEX_A 0x490D8
> +#define _DPST_HIST_INDEX_B 0x491D8
> +#define DPST_HIST_INDEX(pipe)
> _MMIO_PIPE(pipe, _DPST_HIST_INDEX_A, _DPST_HIST_INDEX_B)
> +#define DPST_HIST_BIN_INDEX_MASK
> REG_GENMASK(4, 0)
> +#define DPST_HIST_BIN_INDEX(val)
> REG_FIELD_PREP(DPST_HIST_BIN_INDEX_MASK, val)
> +
> +#define _DPST_HIST_BIN_A 0x490C4
> +#define _DPST_HIST_BIN_B 0x491C4
> +#define DPST_HIST_BIN(pipe) _MMIO_PIPE(pipe,
> _DPST_HIST_BIN_A, _DPST_HIST_BIN_B)
> +#define DPST_HIST_BIN_BUSY REG_BIT(31)
> +#define DPST_HIST_BIN_DATA_MASK
> REG_GENMASK(30, 0)
> +
> +#define _DPST_IE_BIN_A 0x490CC
> +#define _DPST_IE_BIN_B 0x491CC
> +#define DPST_IE_BIN(pipe) _MMIO_PIPE(pipe,
> _DPST_IE_BIN_A, _DPST_IE_BIN_B)
> +#define DPST_IE_BIN_DATA_MASK
> REG_GENMASK(9, 0)
> +#define DPST_IE_BIN_DATA(val)
> REG_FIELD_PREP(DPST_IE_BIN_DATA_MASK, val)
> +
> +#define _DPST_IE_INDEX_A 0x490DC
> +#define _DPST_IE_INDEX_B 0x491DC
> +#define DPST_IE_INDEX(pipe) _MMIO_PIPE(pipe,
> _DPST_IE_INDEX_A, _DPST_IE_INDEX_B)
> +#define DPST_IE_BIN_INDEX_MASK
> REG_GENMASK(6, 0)
> +#define DPST_IE_BIN_INDEX(val)
> REG_FIELD_PREP(DPST_IE_BIN_INDEX_MASK, val)
> +
> #endif /* __INTEL_HISTOGRAM_REGS_H__ */
> --
> 2.25.1
