This is nonsense; clk_round_rate() is just clk_set_rate() without the side effect of changing the hardware.
Signed-off-by: Russell King rmk+kernel@arm.linux.org.uk --- drivers/staging/imx-drm/ipu-v3/ipu-di.c | 13 +++++++++---- 1 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-di.c b/drivers/staging/imx-drm/ipu-v3/ipu-di.c index 8c7241bb435c..d766e18bfca0 100644 --- a/drivers/staging/imx-drm/ipu-v3/ipu-di.c +++ b/drivers/staging/imx-drm/ipu-v3/ipu-di.c @@ -560,9 +560,10 @@ int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig) * rate within 1% of the requested frequency, otherwise we use * the DI clock. */ - if (sig->clkflags & IPU_DI_CLKMODE_EXT) + round = sig->pixelclock; + if (sig->clkflags & IPU_DI_CLKMODE_EXT) { parent = di->clk_di; - else { + } else { unsigned long rate, clkrate; unsigned div, error;
@@ -584,6 +585,9 @@ int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig) ret = clk_set_rate(parent, sig->pixelclock); if (ret) dev_err(di->ipu->dev, "Setting of DI clock failed: %d\n", ret); + + /* Use the integer divisor rate - avoid fractional dividers */ + round = rate; } }
@@ -599,11 +603,12 @@ int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig) * CLKMODE_SYNC means that we want the DI to be clocked at the * same rate as the parent clock. This is needed (eg) for LDB * which needs to be fed with the same pixel clock. + * + * Note: clk_set_rate(clk, clk_round_rate(clk, rate)) is the + * same as clk_set_rate(clk, rate); */ if (sig->clkflags & IPU_DI_CLKMODE_SYNC) round = clk_get_rate(parent); - else - round = clk_round_rate(di->clk_di_pixel, sig->pixelclock);
ret = clk_set_rate(di->clk_di_pixel, round);