[Intel-gfx] [PATCH v6 4/8] drm/i915/vdsc: Add function to read any PPS register
Suraj Kandpal
suraj.kandpal at intel.com
Thu Aug 3 13:03:34 UTC 2023
Add function to read any PPS register based on the
intel_dsc_pps enum provided. Add a function which will call the
new pps read function and place it in crtc state. Only PPS0 and
PPS1 are readout the rest of the registers will be read in upcoming
patches.
--v2
-Changes in read function as PPS enum is removed
-Initialize pps_val as 0 in pps_read func itself [Jani]
-Create a function that gets the required register and call that
in the common read function [Jani]
-Move the drm_WARN_ON one abstraction layer above [Jani]
--v3
-Send both reg values regardless of dsc engine no [Jani]
-Don't use num_vdsc_instances stick to dsc_split field [Ankit]
--v4
-Manipulate the reg values instead of creating MACRO to change
name of pps [Ankit]
--v5
-Read dsc reg values using array rather than individual variables
[Ankit]
-Loop the verification of all dsc engine reads to future proof it
[Ankit]
-Keep the fix me comment in this patch and remove it in later one
where we add other readouts [Ankit]
-Add switch statement that fills in the required registers based on
no of vdsc engines per pipe.
Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
drivers/gpu/drm/i915/display/intel_vdsc.c | 128 +++++++++++++-----
.../gpu/drm/i915/display/intel_vdsc_regs.h | 12 ++
2 files changed, 104 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index cd7b7b00be44..f283580c2860 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -365,6 +365,29 @@ int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
return num_vdsc_instances;
}
+static void intel_dsc_get_pps_reg(struct intel_crtc_state *crtc_state, int pps,
+ i915_reg_t *dsc_reg)
+{
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+ enum pipe pipe = crtc->pipe;
+ bool pipe_dsc;
+ int no_vdsc_ins_per_pipe = intel_dsc_get_no_vdsc_inst_per_pipe(crtc_state);
+
+ pipe_dsc = is_pipe_dsc(crtc, cpu_transcoder);
+
+ switch (no_vdsc_ins_per_pipe) {
+ case 2:
+ dsc_reg[1] = pipe_dsc ? ICL_DSC1_PPS_REG(pipe, pps) : DSCC_PPS_REG(pps);
+ fallthrough;
+ case 1:
+ dsc_reg[0] = pipe_dsc ? ICL_DSC0_PPS_REG(pipe, pps) : DSCA_PPS_REG(pps);
+ break;
+ default:
+ MISSING_CASE(no_vdsc_ins_per_pipe);
+ }
+}
+
static void intel_dsc_pps_configure(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -994,17 +1017,81 @@ void intel_dsc_disable(const struct intel_crtc_state *old_crtc_state)
}
}
+static int intel_dsc_read_pps_reg(struct intel_crtc_state *crtc_state,
+ int pps, u32 *pps_val)
+{
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+ const int no_vdsc_instances_per_pipe = intel_dsc_get_no_vdsc_inst_per_pipe(crtc_state);
+ i915_reg_t *dsc_reg;
+ u32 *pps_temp;
+ int i;
+
+ dsc_reg = kcalloc(no_vdsc_instances_per_pipe, sizeof(dsc_reg), GFP_KERNEL);
+ if (!dsc_reg)
+ return -ENOMEM;
+
+ pps_temp = kcalloc(no_vdsc_instances_per_pipe, sizeof(pps_temp), GFP_KERNEL);
+ if (!pps_temp) {
+ kfree(dsc_reg);
+ return -ENOMEM;
+ }
+
+ *pps_val = 0;
+ intel_dsc_get_pps_reg(crtc_state, pps, dsc_reg);
+ *pps_val = intel_de_read(i915, dsc_reg[0]);
+ if (no_vdsc_instances_per_pipe > 1) {
+ for (i = 0; i < no_vdsc_instances_per_pipe - 1; i++) {
+ pps_temp[i] = intel_de_read(i915, dsc_reg[i]);
+ pps_temp[i + 1] = intel_de_read(i915, dsc_reg[i + 1]);
+ if (pps_temp[i] != pps_temp[i + 1])
+ return 1;
+ }
+ }
+
+ kfree(dsc_reg);
+ kfree(pps_temp);
+ return 0;
+}
+
+static void intel_dsc_read_and_verify_pps_reg(struct intel_crtc_state *crtc_state,
+ int pps, u32 *pps_val)
+{
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+ int ret;
+
+ ret = intel_dsc_read_pps_reg(crtc_state, pps, pps_val);
+ drm_WARN_ON(&i915->drm, ret);
+}
+
+static void intel_dsc_get_pps_config(struct intel_crtc_state *crtc_state)
+{
+ struct drm_dsc_config *vdsc_cfg = &crtc_state->dsc.config;
+ u32 pps_temp1, pps_temp2;
+
+ /* FIXME: add more state readout as needed */
+
+ /* Readout PPS_0 and PPS_1 registers */
+ intel_dsc_read_and_verify_pps_reg(crtc_state, 0, &pps_temp1);
+ intel_dsc_read_and_verify_pps_reg(crtc_state, 1, &pps_temp2);
+
+ vdsc_cfg->bits_per_pixel = pps_temp2;
+
+ if (pps_temp1 & DSC_NATIVE_420_ENABLE)
+ vdsc_cfg->bits_per_pixel >>= 1;
+
+ crtc_state->dsc.compressed_bpp = vdsc_cfg->bits_per_pixel >> 4;
+}
+
void intel_dsc_get_config(struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
- struct drm_dsc_config *vdsc_cfg = &crtc_state->dsc.config;
enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
- enum pipe pipe = crtc->pipe;
enum intel_display_power_domain power_domain;
intel_wakeref_t wakeref;
- u32 dss_ctl1, dss_ctl2, pps0 = 0, pps1 = 0, pps_temp0, pps_temp1;
- int no_vdsc_instances_per_pipe;
+ u32 dss_ctl1, dss_ctl2;
if (!intel_dsc_source_support(crtc_state))
return;
@@ -1025,38 +1112,7 @@ void intel_dsc_get_config(struct intel_crtc_state *crtc_state)
crtc_state->dsc.dsc_split = (dss_ctl2 & RIGHT_BRANCH_VDSC_ENABLE) &&
(dss_ctl1 & JOINER_ENABLE);
- /* FIXME: add more state readout as needed */
-
- no_vdsc_instances_per_pipe = intel_dsc_get_no_vdsc_inst_per_pipe(crtc_state);
-
- /* PPS0 & PPS1 */
- if (!is_pipe_dsc(crtc, cpu_transcoder)) {
- pps1 = intel_de_read(dev_priv, DSCA_PICTURE_PARAMETER_SET_1);
- if (no_vdsc_instances_per_pipe > 1) {
- pps_temp1 = intel_de_read(dev_priv, DSCC_PICTURE_PARAMETER_SET_1);
- drm_WARN_ON(&dev_priv->drm, pps1 != pps_temp1);
- }
- } else {
- pps0 = intel_de_read(dev_priv,
- ICL_DSC0_PICTURE_PARAMETER_SET_0(pipe));
- pps1 = intel_de_read(dev_priv,
- ICL_DSC0_PICTURE_PARAMETER_SET_1(pipe));
- if (no_vdsc_instances_per_pipe > 1) {
- pps_temp0 = intel_de_read(dev_priv,
- ICL_DSC1_PICTURE_PARAMETER_SET_0(pipe));
- pps_temp1 = intel_de_read(dev_priv,
- ICL_DSC1_PICTURE_PARAMETER_SET_1(pipe));
- drm_WARN_ON(&dev_priv->drm, pps0 != pps_temp0);
- drm_WARN_ON(&dev_priv->drm, pps1 != pps_temp1);
- }
- }
-
- vdsc_cfg->bits_per_pixel = pps1;
-
- if (pps0 & DSC_NATIVE_420_ENABLE)
- vdsc_cfg->bits_per_pixel >>= 1;
-
- crtc_state->dsc.compressed_bpp = vdsc_cfg->bits_per_pixel >> 4;
+ intel_dsc_get_pps_config(crtc_state);
out:
intel_display_power_put(dev_priv, power_domain, wakeref);
}
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc_regs.h b/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
index 785ede31116e..862dc708c5fc 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
@@ -78,6 +78,10 @@
/* Icelake Display Stream Compression Registers */
#define DSCA_PICTURE_PARAMETER_SET_0 _MMIO(0x6B200)
#define DSCC_PICTURE_PARAMETER_SET_0 _MMIO(0x6BA00)
+#define DSCA_PPS_0 0x6B200
+#define DSCC_PPS_0 0x6BA00
+#define DSCA_PPS_REG(pps) _MMIO(DSCA_PPS_0 + (pps) * 4)
+#define DSCC_PPS_REG(pps) _MMIO(DSCC_PPS_0 + (pps) * 4)
#define _ICL_DSC0_PICTURE_PARAMETER_SET_0_PB 0x78270
#define _ICL_DSC1_PICTURE_PARAMETER_SET_0_PB 0x78370
#define _ICL_DSC0_PICTURE_PARAMETER_SET_0_PC 0x78470
@@ -88,6 +92,14 @@
#define ICL_DSC1_PICTURE_PARAMETER_SET_0(pipe) _MMIO_PIPE((pipe) - PIPE_B, \
_ICL_DSC1_PICTURE_PARAMETER_SET_0_PB, \
_ICL_DSC1_PICTURE_PARAMETER_SET_0_PC)
+#define ICL_DSC0_PPS_0(pipe) _PICK_EVEN((pipe) - PIPE_B, \
+ _ICL_DSC0_PICTURE_PARAMETER_SET_0_PB, \
+ _ICL_DSC0_PICTURE_PARAMETER_SET_0_PC)
+#define ICL_DSC1_PPS_0(pipe) _PICK_EVEN((pipe) - PIPE_B, \
+ _ICL_DSC1_PICTURE_PARAMETER_SET_0_PB, \
+ _ICL_DSC1_PICTURE_PARAMETER_SET_0_PC)
+#define ICL_DSC0_PPS_REG(pipe, pps) _MMIO(ICL_DSC0_PPS_0(pipe) + ((pps) * 4))
+#define ICL_DSC1_PPS_REG(pipe, pps) _MMIO(ICL_DSC1_PPS_0(pipe) + ((pps) * 4))
#define DSC_NATIVE_422_ENABLE BIT(23)
#define DSC_NATIVE_420_ENABLE BIT(22)
#define DSC_ALT_ICH_SEL (1 << 20)
--
2.25.1
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