drm/msm/dpu: stop mapping the regdma region

Stop mapping the regdma region. The driver does not support regdma.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/533150/
Link: https://lore.kernel.org/r/20230420222558.1208887-2-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

@@ -1080,12 +1080,6 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 		DPU_DEBUG("VBIF NRT is not defined");
 	}
 
-	dpu_kms->reg_dma = msm_ioremap_quiet(dpu_kms->pdev, "regdma");
-	if (IS_ERR(dpu_kms->reg_dma)) {
-		dpu_kms->reg_dma = NULL;
-		DPU_DEBUG("REG_DMA is not defined");
-	}
-
 	dpu_kms_parse_data_bus_icc_path(dpu_kms);
 
 	rc = pm_runtime_resume_and_get(&dpu_kms->pdev->dev);

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h

@@ -71,7 +71,7 @@ struct dpu_kms {
 	const struct dpu_mdss_cfg *catalog;
 
 	/* io/register spaces: */
-	void __iomem *mmio, *vbif[VBIF_MAX], *reg_dma;
+	void __iomem *mmio, *vbif[VBIF_MAX];
 
 	struct regulator *vdd;
 	struct regulator *mmagic;