> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Arun R
> Murthy
> Sent: Wednesday, August 21, 2024 3:54 PM
> To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Murthy, Arun R <arun.r.murthy@xxxxxxxxx>
> Subject: [PATCHv2 5/5] drm/i915/display/histogram: Histogram changes for
> Display LNL+
Drm/i915/histogram should suffice
Lets not use LNL+ use Display 20+
>
> In LNL+, histogram/IE data and index registers are added which was included in
Same here
> the control registers in the legacy platforms. The new registers are used for
> reading histogram and writing the IET LUT data.
>
> v2: Removed duplicate code (Jani)
>
> Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
> ---
> .../gpu/drm/i915/display/intel_histogram.c | 138 ++++++++++++------
> .../gpu/drm/i915/display/intel_histogram.h | 25 ++++
> 2 files changed, 122 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c
> b/drivers/gpu/drm/i915/display/intel_histogram.c
> index 189f7ccd6df8..9c31a7d83362 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.c
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.c
> @@ -26,38 +26,41 @@ struct intel_histogram {
> u32 bindata[HISTOGRAM_BIN_COUNT];
> };
>
> -static void intel_histogram_handle_int_work(struct work_struct *work)
> +static void intel_histogram_read_data(struct intel_histogram
> +*histogram)
> {
> - struct intel_histogram *histogram = container_of(work,
> - struct intel_histogram, handle_histogram_int_work.work);
> struct drm_i915_private *i915 = histogram->i915;
> struct intel_crtc *intel_crtc = histogram->crtc;
> - char *histogram_event[] = {"HISTOGRAM=1", NULL};
> u32 dpstbin;
> int i, try = 0;
>
> - /* Wa: 14014889975 */
> - if (IS_DISPLAY_VER(i915, 12, 13))
Looks messy will be cleaner when you move WA to 1 function as mentioned in previous patch review
> +retry:
> + if (DISPLAY_VER(i915) >= 20) {
> + /* Set index to zero */
> + intel_de_rmw(i915, DPST_HIST_INDEX(intel_crtc->pipe),
> + DPST_HIST_BIN_INDEX_MASK,
> DPST_HIST_BIN_INDEX(0));
> + } else {
> intel_de_rmw(i915, DPST_CTL(intel_crtc->pipe),
> - DPST_CTL_RESTORE, 0);
> + DPST_CTL_BIN_REG_FUNC_SEL |
> DPST_CTL_BIN_REG_MASK, 0);
> + }
>
> - /*
> - * TODO: PSR to be exited while reading the Histogram data
> - * Set DPST_CTL Bin Reg function select to TC
> - * Set DPST_CTL Bin Register Index to 0
> - */
> -retry:
> - intel_de_rmw(i915, DPST_CTL(intel_crtc->pipe),
> - DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_BIN_REG_MASK,
> 0);
> for (i = 0; i < HISTOGRAM_BIN_COUNT; i++) {
> - dpstbin = intel_de_read(i915, DPST_BIN(intel_crtc->pipe));
> + dpstbin = intel_de_read(i915, DPST_HIST_BIN(intel_crtc->pipe));
> if (dpstbin & DPST_BIN_BUSY) {
> /*
> * If DPST_BIN busy bit is set, then set the
> * DPST_CTL bin reg index to 0 and proceed
> * from beginning.
> */
> - if (try++ >= 5) {
> + if (DISPLAY_VER(i915) >= 20) {
> + intel_de_rmw(i915,
> DPST_HIST_INDEX(intel_crtc->pipe),
> + DPST_HIST_BIN_INDEX_MASK,
> + DPST_HIST_BIN_INDEX(0));
> + } else {
> + intel_de_rmw(i915, DPST_CTL(intel_crtc->pipe),
> + DPST_CTL_BIN_REG_MASK, 0);
> + }
> +
> + if (try++ == 5) {
> drm_err(&i915->drm,
> "Histogram block is busy, failed to
> read\n");
> intel_de_rmw(i915, DPST_GUARD(intel_crtc-
> >pipe), @@ -66,10 +69,37 @@ static void
> intel_histogram_handle_int_work(struct work_struct *work)
> }
> goto retry;
> }
> - histogram->bindata[i] = dpstbin & DPST_BIN_DATA_MASK;
> + histogram->bindata[i] = dpstbin & DPST_HIST_BIN_DATA_MASK;
> drm_dbg_atomic(&i915->drm, "Histogram[%d]=%x\n",
> i, histogram->bindata[i]);
> }
> +}
> +
> +static void intel_histogram_get_data(struct intel_histogram *histogram)
> +{
> +
> + /*
> + * TODO: PSR to be exited while reading the Histogram data
> + * Set DPST_CTL Bin Reg function select to TC
> + * Set DPST_CTL Bin Register Index to 0
> + */
> + intel_histogram_read_data(histogram);
> +}
Maybe add read data and get data at the first patch will make this patch much more
Cleaner and pleasing shouldn't really have any effect on build or functionality.
> +
> +static void intel_histogram_handle_int_work(struct work_struct *work) {
> + struct intel_histogram *histogram = container_of(work,
> + struct intel_histogram, handle_histogram_int_work.work);
> + struct drm_i915_private *i915 = histogram->i915;
> + struct intel_crtc *intel_crtc = histogram->crtc;
> + char *histogram_event[] = {"HISTOGRAM=1", NULL};
> +
> + /* Wa: 14014889975 */
> + if (IS_DISPLAY_VER(i915, 12, 13))
> + intel_de_rmw(i915, DPST_CTL(intel_crtc->pipe),
> + DPST_CTL_RESTORE, 0);
> +
> + intel_histogram_get_data(histogram);
>
> drm_property_replace_global_blob(&i915->drm,
> &intel_crtc->config->histogram,
> @@ -161,12 +191,19 @@ static int intel_histogram_enable(struct intel_crtc
> *intel_crtc)
> * enable DPST_CTL Histogram mode
> * Clear DPST_CTL Bin Reg function select to TC
> */
> - intel_de_rmw(i915, 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_BIN_REG_FUNC_TC | DPST_CTL_IE_HIST_EN |
> - DPST_CTL_HIST_MODE_HSV |
> - DPST_CTL_IE_TABLE_VALUE_FORMAT_1INT_9FRAC);
> + if (DISPLAY_VER(i915) >= 20)
> + intel_de_rmw(i915, DPST_CTL(pipe),
> + DPST_CTL_IE_HIST_EN |
> + DPST_CTL_HIST_MODE,
> + DPST_CTL_IE_HIST_EN |
> + DPST_CTL_HIST_MODE_HSV);
> + else
> + intel_de_rmw(i915, 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_BIN_REG_FUNC_TC |
> DPST_CTL_IE_HIST_EN |
> + DPST_CTL_HIST_MODE_HSV |
> + DPST_CTL_IE_TABLE_VALUE_FORMAT_1INT_9FRAC);
>
> /* Re-Visit: check if wait for one vblank is required */
> drm_crtc_wait_one_vblank(&intel_crtc->base);
> @@ -252,24 +289,43 @@ int intel_histogram_set_iet_lut(struct intel_crtc
> *intel_crtc, u32 *data)
> * Set DPST_CTL Bin Reg function select to IE
> * Set DPST_CTL Bin Register Index to 0
> */
> - intel_de_rmw(i915, DPST_CTL(pipe),
> - DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_BIN_REG_MASK,
> - DPST_CTL_BIN_REG_FUNC_IE | DPST_CTL_BIN_REG_CLEAR);
> -
> - for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
> - intel_de_rmw(i915, DPST_BIN(pipe),
> - DPST_BIN_DATA_MASK, data[i]);
> - drm_dbg_atomic(&i915->drm, "iet_lut[%d]=%x\n", i, data[i]);
> + if (DISPLAY_VER(i915) >= 20) {
> + /* Set index to zero */
> + intel_de_rmw(i915, DPST_IE_INDEX(pipe),
> + DPST_IE_BIN_INDEX_MASK, DPST_IE_BIN_INDEX(0));
> + for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
> + intel_de_rmw(i915, DPST_IE_BIN(pipe),
> + DPST_IE_BIN_DATA_MASK,
> + DPST_IE_BIN_DATA(data[i]));
> + drm_dbg_atomic(&i915->drm, "iet_lut[%d]=%x\n",
> + i, data[i]);
> + }
> + intel_de_rmw(i915, DPST_CTL(pipe),
> + DPST_CTL_ENHANCEMENT_MODE_MASK |
> + DPST_CTL_IE_MODI_TABLE_EN,
> + DPST_CTL_EN_MULTIPLICATIVE |
> + DPST_CTL_IE_MODI_TABLE_EN);
> + } else {
> + intel_de_rmw(i915, DPST_CTL(pipe),
> + DPST_CTL_BIN_REG_FUNC_SEL |
> DPST_CTL_BIN_REG_MASK,
> + DPST_CTL_BIN_REG_FUNC_IE |
> DPST_CTL_BIN_REG_CLEAR);
> + for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
> + intel_de_rmw(i915, DPST_BIN(pipe),
> + DPST_BIN_DATA_MASK, data[i]);
> + drm_dbg_atomic(&i915->drm, "iet_lut[%d]=%x\n",
> + i, data[i]);
> + }
> + intel_de_rmw(i915, DPST_CTL(pipe),
> + DPST_CTL_ENHANCEMENT_MODE_MASK |
> + DPST_CTL_IE_MODI_TABLE_EN,
> + DPST_CTL_EN_MULTIPLICATIVE |
> + DPST_CTL_IE_MODI_TABLE_EN);
> +
> + /* Once IE is applied, change DPST CTL to TC */
> + intel_de_rmw(i915, DPST_CTL(pipe),
> + DPST_CTL_BIN_REG_FUNC_SEL,
> + DPST_CTL_BIN_REG_FUNC_TC);
> }
> -
> - intel_de_rmw(i915, DPST_CTL(pipe),
> - DPST_CTL_ENHANCEMENT_MODE_MASK |
> DPST_CTL_IE_MODI_TABLE_EN,
> - DPST_CTL_EN_MULTIPLICATIVE |
> DPST_CTL_IE_MODI_TABLE_EN);
> -
> - /* Once IE is applied, change DPST CTL to TC */
> - intel_de_rmw(i915, DPST_CTL(pipe),
> - DPST_CTL_BIN_REG_FUNC_SEL,
> DPST_CTL_BIN_REG_FUNC_TC);
> -
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram.h
> b/drivers/gpu/drm/i915/display/intel_histogram.h
> index 5e24d3c5c28b..436e0b8e9ffd 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.h
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.h
> @@ -48,8 +48,33 @@ enum pipe;
> #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
> 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)
> +
One more reason registers should have its own file
Regards,
Suraj Kandpal
> #define INTEL_HISTOGRAM_PIPEA 0x90000000
> #define INTEL_HISTOGRAM_PIPEB 0x90000002
> #define INTEL_HISTOGRAM_EVENT(pipe) PIPE(pipe, \
> --
> 2.25.1
