It's typical for the bootloader to configure CTL_0 for the boot splash or EFIFB, but for non-DSI use cases the DPU driver tend to pick another CTL and the system might end up with two configured data paths producing data on the same INTF - with resulting graphical artifacts.
Naturally the end goal would be to inherit the bootloader's configuration and provide the user with a glitch free handover from the boot configuration to a running DPU. But such effort will affect clocks, regulators, power-domains etc, so in the meantime this patch simply disables all INTFs and clear all configured data paths, to avoid the graphical artifacts.
Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org --- drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 4 +++ drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 2 ++ drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 36 ++++++++++++++++++++++ drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h | 8 +++++ 4 files changed, 50 insertions(+)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c index 2d4645e01ebf..7aba27c1055a 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c @@ -349,9 +349,13 @@ static void dpu_hw_ctl_clear_all_blendstages(struct dpu_hw_ctl *ctx) DPU_REG_WRITE(c, CTL_LAYER_EXT(LM_0 + i), 0); DPU_REG_WRITE(c, CTL_LAYER_EXT2(LM_0 + i), 0); DPU_REG_WRITE(c, CTL_LAYER_EXT3(LM_0 + i), 0); + + ctx->pending_flush_mask |= dpu_hw_ctl_get_bitmask_mixer(ctx, LM_0 + i); }
DPU_REG_WRITE(c, CTL_FETCH_PIPE_ACTIVE, 0); + + ctx->pending_flush_mask |= CTL_FLUSH_MASK_CTL; }
static void dpu_hw_ctl_setup_blendstage(struct dpu_hw_ctl *ctx, diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c index 88e9cc38c13b..8b01cb660381 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c @@ -970,6 +970,8 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
dpu_kms->rm_init = true;
+ dpu_rm_clear_boot_config(&dpu_kms->rm, dpu_kms->catalog); + dpu_kms->hw_mdp = dpu_hw_mdptop_init(MDP_TOP, dpu_kms->mmio, dpu_kms->catalog); if (IS_ERR(dpu_kms->hw_mdp)) { diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c index fd2d104f0a91..2cf47084482f 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c @@ -4,6 +4,7 @@ */
#define pr_fmt(fmt) "[drm:%s] " fmt, __func__ +#include <linux/delay.h> #include "dpu_kms.h" #include "dpu_hw_lm.h" #include "dpu_hw_ctl.h" @@ -229,6 +230,41 @@ int dpu_rm_init(struct dpu_rm *rm, return rc ? rc : -EFAULT; }
+void dpu_rm_clear_boot_config(struct dpu_rm *rm, struct dpu_mdss_cfg *cat) +{ + struct dpu_hw_intf *intf; + struct dpu_hw_ctl *ctl; + int i; + + for (i = INTF_0; i < INTF_MAX; i++) { + if (!rm->intf_blks[i - INTF_0]) + continue; + + DPU_DEBUG("disabling intf%d timing engine\n", i - INTF_0); + + intf = to_dpu_hw_intf(rm->intf_blks[i - INTF_0]); + intf->ops.enable_timing(intf, 0); + } + + /* + * Wait one frame for the INTF timing engine to stop, and then wait one + * more frame, per the documentation. + */ + msleep(32); + + for (i = CTL_0; i < CTL_MAX; i++) { + if (!rm->ctl_blks[i - CTL_0]) + continue; + + DPU_DEBUG("clearing ctl%d layer configuration\n", i - CTL_0); + + ctl = to_dpu_hw_ctl(rm->ctl_blks[i - CTL_0]); + ctl->ops.clear_all_blendstages(ctl); + ctl->ops.trigger_flush(ctl); + ctl->ops.trigger_start(ctl); + } +} + static bool _dpu_rm_needs_split_display(const struct msm_display_topology *top) { return top->num_intf > 1; diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h index 1f12c8d5b8aa..53cd649614a3 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h @@ -88,5 +88,13 @@ void dpu_rm_release(struct dpu_global_state *global_state, int dpu_rm_get_assigned_resources(struct dpu_rm *rm, struct dpu_global_state *global_state, uint32_t enc_id, enum dpu_hw_blk_type type, struct dpu_hw_blk **blks, int blks_size); + +/** + * dpu_rm_clear_boot_config() - Tear down any data paths configured by boot + * @rm: DPU Resource Manger handle + * @cat: Pointer to hardware catalog + */ +void dpu_rm_clear_boot_config(struct dpu_rm *rm, struct dpu_mdss_cfg *cat); + #endif /* __DPU_RM_H__ */