[PATCH 1/3] drm/rockchip: cdn-dp: return error code when clk_get_rate failed

Chris Zhong
2017-03-08T02:34:49Z

The clk_get_rate return 0 if something goes wrong, so it can never be
less then zero, the ret should be set a error code, otherwise the
cdn_dp_clk_enable will return 0 when it failed at clk_get_rate.
In addition, clk_get_rate() returns an "unsigned long", so use
"unsigned long" instead of "u32" is better.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

drivers/gpu/drm/rockchip/cdn-dp-core.c | 5 +++--
drivers/gpu/drm/rockchip/cdn-dp-reg.c | 2 +-
drivers/gpu/drm/rockchip/cdn-dp-reg.h | 2 +-
3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index fd79a70..9edb8dc 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -94,7 +94,7 @@ static int cdn_dp_grf_write(struct cdn_dp_device *dp,
static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
{
int ret;
- u32 rate;
+ unsigned long rate;

ret = clk_prepare_enable(dp->pclk);
if (ret < 0) {
@@ -123,7 +123,8 @@ static int cdn_dp_clk_enable(struct cdn_dp_device *dp)

rate = clk_get_rate(dp->core_clk);
if (!rate) {
- DRM_DEV_ERROR(dp->dev, "get clk rate failed: %d\n", rate);
+ DRM_DEV_ERROR(dp->dev, "get clk rate failed\n");
+ ret = -EINVAL;
goto err_set_rate;
}

diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.c b/drivers/gpu/drm/rockchip/cdn-dp-reg.c
index 319dbba..963d8ab 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-reg.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.c
@@ -29,7 +29,7 @@
#define LINK_TRAINING_RETRY_MS 20
#define LINK_TRAINING_TIMEOUT_MS 500

-void cdn_dp_set_fw_clk(struct cdn_dp_device *dp, u32 clk)
+void cdn_dp_set_fw_clk(struct cdn_dp_device *dp, unsigned long clk)
{
writel(clk / 1000000, dp->regs + SW_CLK_H);
}
diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.h b/drivers/gpu/drm/rockchip/cdn-dp-reg.h
index b5f2153..3507be3 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-reg.h
+++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.h
@@ -462,7 +462,7 @@ enum vic_bt_type {

void cdn_dp_clock_reset(struct cdn_dp_device *dp);

-void cdn_dp_set_fw_clk(struct cdn_dp_device *dp, u32 clk);
+void cdn_dp_set_fw_clk(struct cdn_dp_device *dp, unsigned long clk);
int cdn_dp_load_firmware(struct cdn_dp_device *dp, const u32 *i_mem,
u32 i_size, const u32 *d_mem, u32 d_size);
int cdn_dp_set_firmware_active(struct cdn_dp_device *dp, bool enable);
--
2.6.3