drm/msm/dpu: Move LM CRC code into separate method

Move layer mixer-specific section of dpu_crtc_get_crc() into a separate
helper method. This way, we can make it easier to get CRCs from other HW
blocks by adding other get_crc helper methods.

Changes since V1:
- Move common bitmasks to dpu_hw_util.h
- Move common CRC methods to dpu_hw_util.c
- Update copyrights
- Change crcs array to a dynamically allocated array and added it as a
  member of crtc_state

Changes since V2:
- Put changes for hw_util into a separate commit
- Revert crcs array to a static array
- Add else case for set_crc_source to return EINVAL if no valid source
  is selected
- Add DPU_CRTC_MAX_CRC_ENTRIES macro

Changes since V3:
- Move crcs array into dpu_crtc_get_lm_crc
- Remove comment about crcs array in dpu_crtc_state struct
- Revert `lm` rename
- Remove DPU_CRTC_MAX_CRC_ENTRIES macro
- Return EINVAL in dpu_crtc_get_crc if no valid CRC source is set

Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/490735/
Link: https://lore.kernel.org/r/20220622171835.7558-2-quic_jesszhan@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index b56f777..b57140c 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2014-2021 The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
@@ -99,17 +100,32 @@ static int dpu_crtc_verify_crc_source(struct drm_crtc *crtc,
        return 0;
 }
 
+static void dpu_crtc_setup_lm_misr(struct dpu_crtc_state *crtc_state)
+{
+       struct dpu_crtc_mixer *m;
+       int i;
+
+       for (i = 0; i < crtc_state->num_mixers; ++i) {
+               m = &crtc_state->mixers[i];
+
+               if (!m->hw_lm || !m->hw_lm->ops.setup_misr)
+                       continue;
+
+               /* Calculate MISR over 1 frame */
+               m->hw_lm->ops.setup_misr(m->hw_lm, true, 1);
+       }
+}
+
 static int dpu_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
 {
        enum dpu_crtc_crc_source source = dpu_crtc_parse_crc_source(src_name);
        enum dpu_crtc_crc_source current_source;
        struct dpu_crtc_state *crtc_state;
        struct drm_device *drm_dev = crtc->dev;
-       struct dpu_crtc_mixer *m;
 
        bool was_enabled;
        bool enable = false;
-       int i, ret = 0;
+       int ret = 0;
 
        if (source < 0) {
                DRM_DEBUG_DRIVER("Invalid CRC source %s for CRTC%d\n", src_name, crtc->index);
@@ -146,16 +162,10 @@ static int dpu_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
 
        crtc_state->crc_frame_skip_count = 0;
 
-       for (i = 0; i < crtc_state->num_mixers; ++i) {
-               m = &crtc_state->mixers[i];
-
-               if (!m->hw_lm || !m->hw_lm->ops.setup_misr)
-                       continue;
-
-               /* Calculate MISR over 1 frame */
-               m->hw_lm->ops.setup_misr(m->hw_lm, true, 1);
-       }
-
+       if (source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
+               dpu_crtc_setup_lm_misr(crtc_state);
+       else
+               ret = -EINVAL;
 
 cleanup:
        drm_modeset_unlock(&crtc->mutex);
@@ -174,26 +184,17 @@ static u32 dpu_crtc_get_vblank_counter(struct drm_crtc *crtc)
        return dpu_encoder_get_vsync_count(encoder);
 }
 
-
-static int dpu_crtc_get_crc(struct drm_crtc *crtc)
+static int dpu_crtc_get_lm_crc(struct drm_crtc *crtc,
+               struct dpu_crtc_state *crtc_state)
 {
-       struct dpu_crtc_state *crtc_state;
        struct dpu_crtc_mixer *m;
        u32 crcs[CRTC_DUAL_MIXERS];
 
-       int i = 0;
        int rc = 0;
-
-       crtc_state = to_dpu_crtc_state(crtc->state);
+       int i;
 
        BUILD_BUG_ON(ARRAY_SIZE(crcs) != ARRAY_SIZE(crtc_state->mixers));
 
-       /* Skip first 2 frames in case of "uncooked" CRCs */
-       if (crtc_state->crc_frame_skip_count < 2) {
-               crtc_state->crc_frame_skip_count++;
-               return 0;
-       }
-
        for (i = 0; i < crtc_state->num_mixers; ++i) {
 
                m = &crtc_state->mixers[i];
@@ -214,6 +215,22 @@ static int dpu_crtc_get_crc(struct drm_crtc *crtc)
                        drm_crtc_accurate_vblank_count(crtc), crcs);
 }
 
+static int dpu_crtc_get_crc(struct drm_crtc *crtc)
+{
+       struct dpu_crtc_state *crtc_state = to_dpu_crtc_state(crtc->state);
+
+       /* Skip first 2 frames in case of "uncooked" CRCs */
+       if (crtc_state->crc_frame_skip_count < 2) {
+               crtc_state->crc_frame_skip_count++;
+               return 0;
+       }
+
+       if (crtc_state->crc_source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
+               return dpu_crtc_get_lm_crc(crtc, crtc_state);
+
+       return -EINVAL;
+}
+
 static bool dpu_crtc_get_scanout_position(struct drm_crtc *crtc,
                                           bool in_vblank_irq,
                                           int *vpos, int *hpos,

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index b8785c3..20df23f 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -201,6 +201,8 @@ struct dpu_crtc {
  * @mixers        : List of active mixers
  * @num_ctls      : Number of ctl paths in use
  * @hw_ctls       : List of active ctl paths
+ * @crc_source    : CRC source
+ * @crc_frame_skip_count: Number of frames skipped before getting CRC
  */
 struct dpu_crtc_state {
        struct drm_crtc_state base;