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drm/msm/hdmi: set hdp clock rate before prepare_enable 

The clock driver usually complains when a clock is being prepared
before setting its rate. It is the case here for "core_clk" which
needs to be set at 19.2 MHz before we attempt a prepare_enable().

Signed-off-by: Stephane Viau <sviau@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Stephane Viau 2014-06-06 10:03:32 -04:00 committed by Rob Clark
parent 370a4d8a79
commit b77f47e789
3 changed files with 11 additions and 0 deletions
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2
drivers/gpu/drm/msm/hdmi/hdmi.c
View File

@ -277,6 +277,7 @@ static int hdmi_bind(struct device *dev, struct device *master, void *data)
static const char *hpd_reg_names[] = {"hpd-gdsc", "hpd-5v"};
static const char *pwr_reg_names[] = {"core-vdda", "core-vcc"};
static const char *hpd_clk_names[] = {"iface_clk", "core_clk", "mdp_core_clk"};
static unsigned long hpd_clk_freq[] = {0, 19200000, 0};
static const char *pwr_clk_names[] = {"extp_clk", "alt_iface_clk"};
config.phy_init = hdmi_phy_8x74_init;
@ -286,6 +287,7 @@ static int hdmi_bind(struct device *dev, struct device *master, void *data)
config.pwr_reg_names = pwr_reg_names;
config.pwr_reg_cnt = ARRAY_SIZE(pwr_reg_names);
config.hpd_clk_names = hpd_clk_names;
config.hpd_freq = hpd_clk_freq;
config.hpd_clk_cnt = ARRAY_SIZE(hpd_clk_names);
config.pwr_clk_names = pwr_clk_names;
config.pwr_clk_cnt = ARRAY_SIZE(pwr_clk_names);

1
drivers/gpu/drm/msm/hdmi/hdmi.h
View File

@ -87,6 +87,7 @@ struct hdmi_platform_config {
/* clks that need to be on for hpd: */
const char **hpd_clk_names;
const long unsigned *hpd_freq;
int hpd_clk_cnt;
/* clks that need to be on for screen pwr (ie pixel clk): */

8
drivers/gpu/drm/msm/hdmi/hdmi_connector.c
View File

@ -127,6 +127,14 @@ static int hpd_enable(struct hdmi_connector *hdmi_connector)
}
for (i = 0; i < config->hpd_clk_cnt; i++) {
if (config->hpd_freq && config->hpd_freq[i]) {
ret = clk_set_rate(hdmi->hpd_clks[i],
config->hpd_freq[i]);
if (ret)
dev_warn(dev->dev, "failed to set clk %s (%d)\n",
config->hpd_clk_names[i], ret);
}
ret = clk_prepare_enable(hdmi->hpd_clks[i]);
if (ret) {
dev_err(dev->dev, "failed to enable hpd clk: %s (%d)\n",