media: rockchip: rkisp1: Mask invalid bits in DPCC parameters

Restrict the DPCC configuration that can be set by userspace to valid
register bits. To do so, reorganize the related register macros to
define valid bitmasks, as well as bits of the DPCC mode register.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Dafna Hirschfeld <dafna@fastmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

2 files changed, 41 insertions, 29 deletions

diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
index ee91cb36c44b..8b4eea77af0d 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
@@ -58,35 +58,47 @@ static void rkisp1_dpcc_config(struct rkisp1_params *params,
 	unsigned int i;
 	u32 mode;
 
-	/* avoid to override the old enable value */
+	/*
+	 * The enable bit is controlled in rkisp1_isp_isr_other_config() and
+	 * must be preserved. The grayscale mode should be configured
+	 * automatically based on the media bus code on the ISP sink pad, so
+	 * only the STAGE1_ENABLE bit can be set by userspace.
+	 */
 	mode = rkisp1_read(params->rkisp1, RKISP1_CIF_ISP_DPCC_MODE);
-	mode &= RKISP1_CIF_ISP_DPCC_ENA;
-	mode |= arg->mode & ~RKISP1_CIF_ISP_DPCC_ENA;
+	mode &= RKISP1_CIF_ISP_DPCC_MODE_DPCC_ENABLE;
+	mode |= arg->mode & RKISP1_CIF_ISP_DPCC_MODE_STAGE1_ENABLE;
 	rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_DPCC_MODE, mode);
+
 	rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_DPCC_OUTPUT_MODE,
-		     arg->output_mode);
+		     arg->output_mode & RKISP1_CIF_ISP_DPCC_OUTPUT_MODE_MASK);
 	rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_DPCC_SET_USE,
-		     arg->set_use);
+		     arg->set_use & RKISP1_CIF_ISP_DPCC_SET_USE_MASK);
 
 	for (i = 0; i < RKISP1_CIF_ISP_DPCC_METHODS_MAX; i++) {
 		rkisp1_write(params->rkisp1, RKISP1_ISP_DPCC_METHODS_SET(i),
-			     arg->methods[i].method);
+			     arg->methods[i].method &
+			     RKISP1_CIF_ISP_DPCC_METHODS_SET_MASK);
 		rkisp1_write(params->rkisp1, RKISP1_ISP_DPCC_LINE_THRESH(i),
-			     arg->methods[i].line_thresh);
+			     arg->methods[i].line_thresh &
+			     RKISP1_CIF_ISP_DPCC_LINE_THRESH_MASK);
 		rkisp1_write(params->rkisp1, RKISP1_ISP_DPCC_LINE_MAD_FAC(i),
-			     arg->methods[i].line_mad_fac);
+			     arg->methods[i].line_mad_fac &
+			     RKISP1_CIF_ISP_DPCC_LINE_MAD_FAC_MASK);
 		rkisp1_write(params->rkisp1, RKISP1_ISP_DPCC_PG_FAC(i),
-			     arg->methods[i].pg_fac);
+			     arg->methods[i].pg_fac &
+			     RKISP1_CIF_ISP_DPCC_PG_FAC_MASK);
 		rkisp1_write(params->rkisp1, RKISP1_ISP_DPCC_RND_THRESH(i),
-			     arg->methods[i].rnd_thresh);
+			     arg->methods[i].rnd_thresh &
+			     RKISP1_CIF_ISP_DPCC_RND_THRESH_MASK);
 		rkisp1_write(params->rkisp1, RKISP1_ISP_DPCC_RG_FAC(i),
-			     arg->methods[i].rg_fac);
+			     arg->methods[i].rg_fac &
+			     RKISP1_CIF_ISP_DPCC_RG_FAC_MASK);
 	}
 
 	rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_DPCC_RND_OFFS,
-		     arg->rnd_offs);
+		     arg->rnd_offs & RKISP1_CIF_ISP_DPCC_RND_OFFS_MASK);
 	rkisp1_write(params->rkisp1, RKISP1_CIF_ISP_DPCC_RO_LIMITS,
-		     arg->ro_limits);
+		     arg->ro_limits & RKISP1_CIF_ISP_DPCC_RO_LIMIT_MASK);
 }
 
 /* ISP black level subtraction interface function */
@@ -1214,11 +1226,11 @@ rkisp1_isp_isr_other_config(struct rkisp1_params *params,
 		if (module_ens & RKISP1_CIF_ISP_MODULE_DPCC)
 			rkisp1_param_set_bits(params,
 					      RKISP1_CIF_ISP_DPCC_MODE,
-					      RKISP1_CIF_ISP_DPCC_ENA);
+					      RKISP1_CIF_ISP_DPCC_MODE_DPCC_ENABLE);
 		else
 			rkisp1_param_clear_bits(params,
 						RKISP1_CIF_ISP_DPCC_MODE,
-						RKISP1_CIF_ISP_DPCC_ENA);
+						RKISP1_CIF_ISP_DPCC_MODE_DPCC_ENABLE);
 	}
 
 	/* update bls config */
@@ -1580,7 +1592,7 @@ void rkisp1_params_configure(struct rkisp1_params *params,
 void rkisp1_params_disable(struct rkisp1_params *params)
 {
 	rkisp1_param_clear_bits(params, RKISP1_CIF_ISP_DPCC_MODE,
-				RKISP1_CIF_ISP_DPCC_ENA);
+				RKISP1_CIF_ISP_DPCC_MODE_DPCC_ENABLE);
 	rkisp1_param_clear_bits(params, RKISP1_CIF_ISP_LSC_CTRL,
 				RKISP1_CIF_ISP_LSC_CTRL_ENA);
 	rkisp1_param_clear_bits(params, RKISP1_CIF_ISP_BLS_CTRL,
diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-regs.h b/drivers/media/platform/rockchip/rkisp1/rkisp1-regs.h
index dd3e6c38be67..dc01f968c19d 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-regs.h
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-regs.h
@@ -618,19 +618,19 @@
 #define RKISP1_CIF_ISP_CTRL_ISP_GAMMA_OUT_ENA_READ(x)	(((x) >> 11) & 1)
 
 /* DPCC */
-/* ISP_DPCC_MODE */
-#define RKISP1_CIF_ISP_DPCC_ENA				BIT(0)
-#define RKISP1_CIF_ISP_DPCC_MODE_MAX			0x07
-#define RKISP1_CIF_ISP_DPCC_OUTPUTMODE_MAX		0x0F
-#define RKISP1_CIF_ISP_DPCC_SETUSE_MAX			0x0F
-#define RKISP1_CIF_ISP_DPCC_METHODS_SET_RESERVED	0xFFFFE000
-#define RKISP1_CIF_ISP_DPCC_LINE_THRESH_RESERVED	0xFFFF0000
-#define RKISP1_CIF_ISP_DPCC_LINE_MAD_FAC_RESERVED	0xFFFFC0C0
-#define RKISP1_CIF_ISP_DPCC_PG_FAC_RESERVED		0xFFFFC0C0
-#define RKISP1_CIF_ISP_DPCC_RND_THRESH_RESERVED		0xFFFF0000
-#define RKISP1_CIF_ISP_DPCC_RG_FAC_RESERVED		0xFFFFC0C0
-#define RKISP1_CIF_ISP_DPCC_RO_LIMIT_RESERVED		0xFFFFF000
-#define RKISP1_CIF_ISP_DPCC_RND_OFFS_RESERVED		0xFFFFF000
+#define RKISP1_CIF_ISP_DPCC_MODE_DPCC_ENABLE		BIT(0)
+#define RKISP1_CIF_ISP_DPCC_MODE_GRAYSCALE_MODE		BIT(1)
+#define RKISP1_CIF_ISP_DPCC_MODE_STAGE1_ENABLE		BIT(2)
+#define RKISP1_CIF_ISP_DPCC_OUTPUT_MODE_MASK		GENMASK(3, 0)
+#define RKISP1_CIF_ISP_DPCC_SET_USE_MASK		GENMASK(3, 0)
+#define RKISP1_CIF_ISP_DPCC_METHODS_SET_MASK		0x00001f1f
+#define RKISP1_CIF_ISP_DPCC_LINE_THRESH_MASK		0x0000ffff
+#define RKISP1_CIF_ISP_DPCC_LINE_MAD_FAC_MASK		0x00003f3f
+#define RKISP1_CIF_ISP_DPCC_PG_FAC_MASK			0x00003f3f
+#define RKISP1_CIF_ISP_DPCC_RND_THRESH_MASK		0x0000ffff
+#define RKISP1_CIF_ISP_DPCC_RG_FAC_MASK			0x00003f3f
+#define RKISP1_CIF_ISP_DPCC_RO_LIMIT_MASK		0x00000fff
+#define RKISP1_CIF_ISP_DPCC_RND_OFFS_MASK		0x00000fff
 
 /* BLS */
 /* ISP_BLS_CTRL */