linux-kernel - [PATCH 4/7] drm/msm/dpu: Allow configuring multiple active DSC blocks

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Date: Wed, 17 Apr 2024 01:57:44 +0200
From: Marijn Suijten <marijn.suijten@...ainline.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Archit Taneja <architt@...eaurora.org>, 
 Chandan Uddaraju <chandanu@...eaurora.org>, Vinod Koul <vkoul@...nel.org>, 
 Sravanthi Kollukuduru <skolluku@...eaurora.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Jordan Crouse <jordan@...micpenguin.net>, 
 Rajesh Yadav <ryadav@...eaurora.org>, 
 Jeykumar Sankaran <jsanka@...eaurora.org>, 
 ~postmarketos/upstreaming@...ts.sr.ht, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Martin Botka <martin.botka@...ainline.org>, 
 Jami Kettunen <jami.kettunen@...ainline.org>, 
 Marijn Suijten <marijn.suijten@...ainline.org>
Subject: [PATCH 4/7] drm/msm/dpu: Allow configuring multiple active DSC
 blocks

Just like the active interface and writeback block in ctl_intf_cfg_v1(),
and later the rest of the blocks in followup active-CTL fixes or
reworks, multiple calls to this function should enable additional DSC
blocks instead of overwriting the blocks that are enabled.

This pattern is observed in an active-CTL scenario since DPU 5.0.0 where
for example bonded-DSI uses a single CTL to drive multiple INTFs, and
each encoder calls this function individually with the INTF (hence the
pre-existing update instead of overwrite of this bitmask) and DSC blocks
it wishes to be enabled, and expects them to be OR'd into the bitmask.

The reverse already exists in reset_intf_cfg_v1() where only specified
DSC blocks are removed out of the CTL_DSC_ACTIVE bitmask (same for all
other blocks and ACTIVE bitmasks), leaving the rest enabled.

Fixes: 77f6da90487c ("drm/msm/disp/dpu1: Add DSC support in hw_ctl")
Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

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 a06f69d0b257..2e50049f2f85 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
@@ -545,6 +545,7 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 {
 	struct dpu_hw_blk_reg_map *c = &ctx->hw;
 	u32 intf_active = 0;
+	u32 dsc_active = 0;
 	u32 wb_active = 0;
 	u32 mode_sel = 0;
 
@@ -560,6 +561,7 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 
 	intf_active = DPU_REG_READ(c, CTL_INTF_ACTIVE);
 	wb_active = DPU_REG_READ(c, CTL_WB_ACTIVE);
+	dsc_active = DPU_REG_READ(c, CTL_DSC_ACTIVE);
 
 	if (cfg->intf)
 		intf_active |= BIT(cfg->intf - INTF_0);
@@ -567,17 +569,18 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 	if (cfg->wb)
 		wb_active |= BIT(cfg->wb - WB_0);
 
+	if (cfg->dsc)
+		dsc_active |= cfg->dsc;
+
 	DPU_REG_WRITE(c, CTL_TOP, mode_sel);
 	DPU_REG_WRITE(c, CTL_INTF_ACTIVE, intf_active);
 	DPU_REG_WRITE(c, CTL_WB_ACTIVE, wb_active);
+	DPU_REG_WRITE(c, CTL_DSC_ACTIVE, dsc_active);
 
 	if (cfg->merge_3d)
 		DPU_REG_WRITE(c, CTL_MERGE_3D_ACTIVE,
 			      BIT(cfg->merge_3d - MERGE_3D_0));
 
-	if (cfg->dsc)
-		DPU_REG_WRITE(c, CTL_DSC_ACTIVE, cfg->dsc);
-
 	if (cfg->cdm)
 		DPU_REG_WRITE(c, CTL_CDM_ACTIVE, cfg->cdm);
 }

-- 
2.44.0