video: driver: improve error handling on read_register

Currently video driver ignoring error value returned by
__read_register() api. So added changes to improve error
handling.

Change-Id: Ia3968f0f900915b46b96c5e790af9be02389e841
Signed-off-by: Govindaraj Rajagopal <[email protected]>

driver/variant/iris2/src/msm_vidc_iris2.c

@@ -366,7 +366,9 @@ static int __interrupt_init_iris2(struct msm_vidc_core *vidc_core)
 	}
 
 	/* All interrupts should be disabled initially 0x1F6 : Reset value */
-	mask_val = __read_register(core, WRAPPER_INTR_MASK_IRIS2);
+	rc = __read_register(core, WRAPPER_INTR_MASK_IRIS2, &mask_val);
+	if (rc)
+		return rc;
 
 	/* Write 0 to unmask CPU and WD interrupts */
 	mask_val &= ~(WRAPPER_INTR_MASK_A2HWD_BMSK_IRIS2|
@@ -443,10 +445,12 @@ static int __power_off_iris2_hardware(struct msm_vidc_core *core)
 	 * check to make sure core clock branch enabled else
 	 * we cannot read vcodec top idle register
 	 */
-	value = __read_register(core, WRAPPER_CORE_CLOCK_CONFIG_IRIS2);
+	rc = __read_register(core, WRAPPER_CORE_CLOCK_CONFIG_IRIS2, &value);
+	if (rc)
+		return rc;
+
 	if (value) {
-		d_vpr_h(
-			"%s: core clock config not enabled, enabling it to read vcodec registers\n",
+		d_vpr_h("%s: core clock config not enabled, enabling it to read vcodec registers\n",
 			__func__);
 		rc = __write_register(core, WRAPPER_CORE_CLOCK_CONFIG_IRIS2, 0);
 		if (rc)
@@ -729,7 +733,10 @@ static int __prepare_pc_iris2(struct msm_vidc_core *vidc_core)
 		return -EINVAL;
 	}
 
-	ctrl_status = __read_register(core, CTRL_STATUS_IRIS2);
+	rc = __read_register(core, CTRL_STATUS_IRIS2, &ctrl_status);
+	if (rc)
+		return rc;
+
 	pc_ready = ctrl_status & CTRL_STATUS_PC_READY_IRIS2;
 	idle_status = ctrl_status & BIT(30);
 
@@ -737,8 +744,11 @@ static int __prepare_pc_iris2(struct msm_vidc_core *vidc_core)
 		d_vpr_h("Already in pc_ready state\n");
 		return 0;
 	}
+	rc = __read_register(core, WRAPPER_TZ_CPU_STATUS, &wfi_status);
+	if (rc)
+		return rc;
 
-	wfi_status = BIT(0) & __read_register(core, WRAPPER_TZ_CPU_STATUS);
+	wfi_status &= BIT(0);
 	if (!wfi_status || !idle_status) {
 		d_vpr_e("Skipping PC, wfi status not set\n");
 		goto skip_power_off;
@@ -766,9 +776,13 @@ static int __prepare_pc_iris2(struct msm_vidc_core *vidc_core)
 	return rc;
 
 skip_power_off:
-	wfi_status = BIT(0) & __read_register(core, WRAPPER_TZ_CPU_STATUS);
-	ctrl_status = __read_register(core, CTRL_STATUS_IRIS2);
-
+	rc = __read_register(core, CTRL_STATUS_IRIS2, &ctrl_status);
+	if (rc)
+		return rc;
+	rc = __read_register(core, WRAPPER_TZ_CPU_STATUS, &wfi_status);
+	if (rc)
+		return rc;
+	wfi_status &= BIT(0);
 	d_vpr_e("Skip PC, wfi=%#x, idle=%#x, pcr=%#x, ctrl=%#x)\n",
 		wfi_status, idle_status, pc_ready, ctrl_status);
 	return -EAGAIN;
@@ -868,7 +882,10 @@ static int __clear_interrupt_iris2(struct msm_vidc_core *vidc_core)
 		return 0;
 	}
 
-	intr_status = __read_register(core, WRAPPER_INTR_STATUS_IRIS2);
+	rc = __read_register(core, WRAPPER_INTR_STATUS_IRIS2, &intr_status);
+	if (rc)
+		return rc;
+
 	mask = (WRAPPER_INTR_STATUS_A2H_BMSK_IRIS2|
 		WRAPPER_INTR_STATUS_A2HWD_BMSK_IRIS2|
 		CTRL_INIT_IDLE_MSG_BMSK_IRIS2);
@@ -907,7 +924,10 @@ static int __boot_firmware_iris2(struct msm_vidc_core *vidc_core)
 		return rc;
 
 	while (!ctrl_status && count < max_tries) {
-		ctrl_status = __read_register(core, CTRL_STATUS_IRIS2);
+		rc = __read_register(core, CTRL_STATUS_IRIS2, &ctrl_status);
+		if (rc)
+			return rc;
+
 		if ((ctrl_status & CTRL_ERROR_STATUS__M_IRIS2) == 0x4) {
 			d_vpr_e("invalid setting for UC_REGION\n");
 			break;

driver/vidc/inc/venus_hfi.h

@@ -66,7 +66,7 @@ int __write_register_masked(struct msm_vidc_core *core,
 		u32 reg, u32 value, u32 mask);
 int __write_register(struct msm_vidc_core *core,
 		u32 reg, u32 value);
-int __read_register(struct msm_vidc_core *core, u32 reg);
+int __read_register(struct msm_vidc_core *core, u32 reg, u32 *value);
 int __read_register_with_poll_timeout(struct msm_vidc_core *core,
 	u32 reg, u32 mask, u32 exp_val, u32 sleep_us, u32 timeout_us);
 int __iface_cmdq_write(struct msm_vidc_core *core,

driver/vidc/src/venus_hfi.c

@@ -308,12 +308,12 @@ int __write_register_masked(struct msm_vidc_core *core,
 	return rc;
 }
 
-int __read_register(struct msm_vidc_core *core, u32 reg)
+int __read_register(struct msm_vidc_core *core, u32 reg, u32 *value)
 {
 	int rc = 0;
 	u8 *base_addr;
 
-	if (!core) {
+	if (!core || !value) {
 		d_vpr_e("%s: invalid params\n", __func__);
 		return -EINVAL;
 	}
@@ -325,13 +325,13 @@ int __read_register(struct msm_vidc_core *core, u32 reg)
 
 	base_addr = core->register_base_addr;
 
-	rc = readl_relaxed(base_addr + reg);
+	*value = readl_relaxed(base_addr + reg);
 	/*
 	 * Memory barrier to make sure value is read correctly from the
 	 * register.
 	 */
 	rmb();
-	d_vpr_l("regread(%pK + %#x) = %#x\n", base_addr, reg, rc);
+	d_vpr_l("regread(%pK + %#x) = %#x\n", base_addr, reg, *value);
 
 	return rc;
 }