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drm/omap: generalize dss_pll_calc_b() 

dss_pll_calc_b() takes HDMI TMDS clock rate as a parameter. To make
dss_pll_calc_b() usable for non-HDMI users, change the function to take
clkout rate as parameter, and also change the current users of
dss_pll_calc_b() to accommodate that.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2016-05-18 11:15:21 +03:00
parent c17dc0e3a1
commit c107751d12
4 changed files with 17 additions and 8 deletions
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2
drivers/gpu/drm/omapdrm/dss/dss.h
View File

@ -443,7 +443,7 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin,
dss_pll_calc_func func, void *data);
bool dss_pll_calc_b(const struct dss_pll *pll, unsigned long clkin,
unsigned long target_tmds, struct dss_pll_clock_info *cinfo);
unsigned long target_clkout, struct dss_pll_clock_info *cinfo);
int dss_pll_write_config_type_a(struct dss_pll *pll,
const struct dss_pll_clock_info *cinfo);

3
drivers/gpu/drm/omapdrm/dss/hdmi4.c
View File

@ -186,6 +186,9 @@ static int hdmi_power_on_full(struct omap_dss_device *dssdev)
if (p->double_pixel)
pc *= 2;
/* DSS_HDMI_TCLK is bitclk / 10 */
pc *= 10;
dss_pll_calc_b(&hdmi.pll.pll, clk_get_rate(hdmi.pll.pll.clkin),
pc, &hdmi_cinfo);

3
drivers/gpu/drm/omapdrm/dss/hdmi5.c
View File

@ -198,6 +198,9 @@ static int hdmi_power_on_full(struct omap_dss_device *dssdev)
if (p->double_pixel)
pc *= 2;
/* DSS_HDMI_TCLK is bitclk / 10 */
pc *= 10;
dss_pll_calc_b(&hdmi.pll.pll, clk_get_rate(hdmi.pll.pll.clkin),
pc, &hdmi_cinfo);

17
drivers/gpu/drm/omapdrm/dss/pll.c
View File

@ -248,18 +248,21 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin,
return false;
}
/*
* This calculates a PLL config that will provide the target_clkout rate
* for clkout. Additionally clkdco rate will be the same as clkout rate
* when clkout rate is >= min_clkdco.
*/
bool dss_pll_calc_b(const struct dss_pll *pll, unsigned long clkin,
unsigned long target_tmds, struct dss_pll_clock_info *cinfo)
unsigned long target_clkout, struct dss_pll_clock_info *cinfo)
{
unsigned long fint, clkdco, clkout;
unsigned long target_bitclk, target_clkdco;
unsigned long target_clkdco;
unsigned long min_dco;
unsigned n, m, mf, m2, sd;
const struct dss_pll_hw *hw = pll->hw;
DSSDBG("clkin %lu, target tmds %lu\n", clkin, target_tmds);
target_bitclk = target_tmds * 10;
DSSDBG("clkin %lu, target clkout %lu\n", clkin, target_clkout);
/* Fint */
n = DIV_ROUND_UP(clkin, hw->fint_max);
@ -267,11 +270,11 @@ bool dss_pll_calc_b(const struct dss_pll *pll, unsigned long clkin,
/* adjust m2 so that the clkdco will be high enough */
min_dco = roundup(hw->clkdco_min, fint);
m2 = DIV_ROUND_UP(min_dco, target_bitclk);
m2 = DIV_ROUND_UP(min_dco, target_clkout);
if (m2 == 0)
m2 = 1;
target_clkdco = target_bitclk * m2;
target_clkdco = target_clkout * m2;
m = target_clkdco / fint;
clkdco = fint * m;