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drm/tilcdc: Fix setting clock divider for omap-l138 

This fixes setting the clock divider on the TI OMAP-L138 LCDK board.

The clock drivers for OMAP-L138 are being covernted to the common clock
framework. When this happens, clk_set_rate() will no longer return an
error. However, on this SoC, the clock rate cannot actually be changed
because the clock has to maintain a fixed ratio to the ARM clock. So
after attempting to set the clock rate, we need to check to see if the
new rate is actually close enough. If not, then follow the previous
error path to adjust the divider in LCDC IP block to compensate for not
being able to change the parent clock rate.

Tested working on a TI OMAP-L138 LCDK board.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
hifive-unleashed-5.1
David Lechner 2018-03-14 17:58:45 -05:00 committed by Jyri Sarha
parent 6d08b06e67
commit a88ad3ded1
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/tilcdc/tilcdc_crtc.c
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@ -224,7 +224,7 @@ static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
ret = clk_set_rate(priv->clk, req_rate * clkdiv);
clk_rate = clk_get_rate(priv->clk);
if (ret < 0) {
if (ret < 0 || tilcdc_pclk_diff(req_rate, clk_rate) > 5) {
/*
* If we fail to set the clock rate (some architectures don't
* use the common clock framework yet and may not implement