On Fri, 05 Jul 2024, Arun R Murthy <arun.r.murthy@xxxxxxxxx> wrote:
> In LNL+, histogram/IE data and index registers are added which was
> included in the control registers in the legacy platforms. The new
> registers are used for reading histogram and writing the IET LUT data.
>
> Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
> ---
> .../gpu/drm/i915/display/intel_histogram.c | 174 +++++++++++++-----
> .../gpu/drm/i915/display/intel_histogram.h | 25 +++
> 2 files changed, 153 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c b/drivers/gpu/drm/i915/display/intel_histogram.c
> index 61a8cd623f19..46832ca78ee3 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.c
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.c
> @@ -11,29 +11,47 @@
> #include "intel_de.h"
> #include "intel_histogram.h"
>
> -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 =
> - to_intel_crtc(drm_crtc_from_index(&i915->drm, histogram->pipe));
> - char *histogram_event[] = {"HISTOGRAM=1", NULL};
> u32 dpstbin;
> int i, try = 0;
>
> - /* Wa: 14014889975 */
> - if (IS_DISPLAY_VER(i915, 12, 13))
> - intel_de_rmw(i915, DPST_CTL(histogram->pipe),
> - DPST_CTL_RESTORE, 0);
> + /* Set index to zero */
> + intel_de_rmw(i915, DPST_HIST_INDEX(histogram->pipe),
> + DPST_HIST_BIN_INDEX_MASK, DPST_HIST_BIN_INDEX(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
> - */
> - intel_de_rmw(i915, DPST_CTL(histogram->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_HIST_BIN(histogram->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.
> + */
> + intel_de_rmw(i915, DPST_HIST_INDEX(histogram->pipe),
> + DPST_HIST_BIN_INDEX_MASK,
> + DPST_HIST_BIN_INDEX(0));
> + i = 0;
> + if (try++ == 5) {
> + drm_err(&i915->drm,
> + "Histogram block is busy, failed to read\n");
> + intel_de_rmw(i915, DPST_GUARD(histogram->pipe),
> + DPST_GUARD_HIST_EVENT_STATUS, 1);
> + return;
> + }
> + }
> + histogram->bindata[i] = dpstbin & DPST_HIST_BIN_DATA_MASK;
> + drm_dbg_atomic(&i915->drm, "Histogram[%d]=%x\n",
> + i, histogram->bindata[i]);
> + }
> +}
Please figure out a way to not duplicate the logic. Now you have the
infinite loop in two places.
> +
> +static void intel_histogram_read_data_legacy(struct intel_histogram *histogram)
> +{
> + struct drm_i915_private *i915 = histogram->i915;
> + u32 dpstbin;
> + int i, try = 0;
>
> for (i = 0; i < HISTOGRAM_BIN_COUNT; i++) {
> dpstbin = intel_de_read(i915, DPST_BIN(histogram->pipe));
> @@ -58,6 +76,41 @@ static void intel_histogram_handle_int_work(struct work_struct *work)
> drm_dbg_atomic(&i915->drm, "Histogram[%d]=%x\n",
> i, histogram->bindata[i]);
> }
> +}
> +
> +static void intel_histogram_get_data(struct intel_histogram *histogram)
> +{
> + struct drm_i915_private *i915 = histogram->i915;
> +
> + /*
> + * 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
> + */
> + if (DISPLAY_VER(i915) >= 20) {
> + intel_histogram_read_data(histogram);
> + } else {
> + intel_de_rmw(i915, DPST_CTL(histogram->pipe),
> + DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_BIN_REG_MASK, 0);
> + intel_histogram_read_data_legacy(histogram);
> + }
> +}
> +
> +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 =
> + to_intel_crtc(drm_crtc_from_index(&i915->drm, histogram->pipe));
> + char *histogram_event[] = {"HISTOGRAM=1", NULL};
> +
> + /* Wa: 14014889975 */
> + if (IS_DISPLAY_VER(i915, 12, 13))
> + intel_de_rmw(i915, DPST_CTL(histogram->pipe),
> + DPST_CTL_RESTORE, 0);
> +
> + intel_histogram_get_data(histogram);
>
> /* Notify user for Histogram rediness */
> if (kobject_uevent_env(&i915->drm.primary->kdev->kobj, KOBJ_CHANGE,
> @@ -70,13 +123,16 @@ static void intel_histogram_handle_int_work(struct work_struct *work)
> intel_de_write(i915, DPST_CTL(histogram->pipe), intel_de_read(i915,
> DPST_CTL(histogram->pipe)) | DPST_CTL_RESTORE);
>
> - /* Enable histogram interrupt */
> - intel_de_rmw(i915, DPST_GUARD(histogram->pipe), DPST_GUARD_HIST_INT_EN,
> - DPST_GUARD_HIST_INT_EN);
> + if (DISPLAY_VER(i915) <= 14) {
> + /* Enable histogram interrupt */
> + intel_de_rmw(i915, DPST_GUARD(histogram->pipe),
> + DPST_GUARD_HIST_INT_EN,
> + DPST_GUARD_HIST_INT_EN);
>
> - /* Clear histogram interrupt by setting histogram interrupt status bit*/
> - intel_de_rmw(i915, DPST_GUARD(histogram->pipe),
> - DPST_GUARD_HIST_EVENT_STATUS, 1);
> + /* Clear histogram interrupt by setting histogram interrupt status bit*/
> + intel_de_rmw(i915, DPST_GUARD(histogram->pipe),
> + DPST_GUARD_HIST_EVENT_STATUS, 1);
> + }
>
> drm_property_replace_global_blob(&i915->drm,
> &intel_crtc->config->histogram,
> @@ -148,12 +204,19 @@ 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);
> @@ -233,24 +296,43 @@ 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(histogram->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 88942564fdc0..7583b421164a 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.h
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.h
> @@ -47,8 +47,33 @@
> #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)
> +
> #define INTEL_HISTOGRAM_PIPEA 0x90000000
> #define INTEL_HISTOGRAM_PIPEB 0x90000002
> #define INTEL_HISTOGRAM_EVENT(pipe) PIPE(pipe, \
--
Jani Nikula, Intel
