[PATCH v2 7/7] media: camss: csiphy: Set rate on csiX_phy clock on SDM630/660

kholk11
2020-10-22T17:47:32Z

The SDM630/660 SoCs (and variants) have another clock source
for the PHY, which must be set to a rate that's equal or
greater than the CSI PHY timer clock: failing to do this
will produce PHY overflows when trying to get a stream from
a very high bandwidth camera sensor and outputting no frame
or a partial one.

Since I haven't found any usecase in which the csiX_phy
clock needs to be higher than the csiXphy_timer, let's just
set the same rate on both, which seems to work just perfect.

Signed-off-by: AngeloGioacchino Del Regno <kholk11@gmail.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
---
.../media/platform/qcom/camss/camss-csiphy.c | 22 ++++++++++++++++---
.../media/platform/qcom/camss/camss-csiphy.h | 1 +
2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
index c00f25aac21b..a5d717d022a5 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.c
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
@@ -113,9 +113,7 @@ static int csiphy_set_clock_rates(struct csiphy_device *csiphy)
for (i = 0; i < csiphy->nclocks; i++) {
struct camss_clock *clock = &csiphy->clock[i];

- if (!strcmp(clock->name, "csiphy0_timer") ||
- !strcmp(clock->name, "csiphy1_timer") ||
- !strcmp(clock->name, "csiphy2_timer")) {
+ if (csiphy->rate_set[i]) {
u8 bpp = csiphy_get_bpp(csiphy->formats,
csiphy->nformats,
csiphy->fmt[MSM_CSIPHY_PAD_SINK].code);
@@ -611,6 +609,13 @@ int msm_csiphy_subdev_init(struct camss *camss,
if (!csiphy->clock)
return -ENOMEM;

+ csiphy->rate_set = devm_kcalloc(dev,
+ csiphy->nclocks,
+ sizeof(*csiphy->rate_set),
+ GFP_KERNEL);
+ if (!csiphy->rate_set)
+ return -ENOMEM;
+
for (i = 0; i < csiphy->nclocks; i++) {
struct camss_clock *clock = &csiphy->clock[i];

@@ -638,6 +643,17 @@ int msm_csiphy_subdev_init(struct camss *camss,

for (j = 0; j < clock->nfreqs; j++)
clock->freq[j] = res->clock_rate[i][j];
+
+ if (!strcmp(clock->name, "csiphy0_timer") ||
+ !strcmp(clock->name, "csiphy1_timer") ||
+ !strcmp(clock->name, "csiphy2_timer"))
+ csiphy->rate_set[i] = true;
+
+ if (camss->version == CAMSS_660 &&
+ (!strcmp(clock->name, "csi0_phy") ||
+ !strcmp(clock->name, "csi1_phy") ||
+ !strcmp(clock->name, "csi2_phy")))
+ csiphy->rate_set[i] = true;
}

return 0;
diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h
index 376f865ad383..f7967ef836dc 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.h
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.h
@@ -66,6 +66,7 @@ struct csiphy_device {
u32 irq;
char irq_name[30];
struct camss_clock *clock;
+ bool *rate_set;
int nclocks;
u32 timer_clk_rate;
struct csiphy_config cfg;
--
2.28.0