Re: [PATCH 3/6] media: venus: hfi_venus: Support only updating certain bits with presets

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On 04/08/2023 21:09, Konrad Dybcio wrote:
On some platforms (like SM8350) we're expected to only touch certain bits
(such as 0 and 4 corresponding to mask 0x11). Add support for doing so.

Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
---
  drivers/media/platform/qcom/venus/core.h      |  1 +
  drivers/media/platform/qcom/venus/hfi_venus.c | 15 ++++++++++++---
  2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index d996abd339e1..2999c24392f5 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -38,6 +38,7 @@ struct freq_tbl {
  struct reg_val {
  	u32 reg;
  	u32 value;
+	u32 mask;
  };
struct bw_tbl {
diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index 19fc6575a489..d4bad66f7293 100644
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -349,10 +349,19 @@ static void venus_set_registers(struct venus_hfi_device *hdev)
  	const struct venus_resources *res = hdev->core->res;
  	const struct reg_val *tbl = res->reg_tbl;
  	unsigned int count = res->reg_tbl_size;
-	unsigned int i;
+	unsigned int i, val;

u32 val;

+
+	for (i = 0; i < count; i++) {
+		val = tbl[i].value;

struct reg_val looks like this

struct reg_val {
        u32 reg;
        u32 value;
};

val should be declared a u32

-	for (i = 0; i < count; i++)
-		writel(tbl[i].value, hdev->core->base + tbl[i].reg);
+		/* In some cases, we only want to update certain bits */

I'll trust this is a legitimate and true statement.

+		if (tbl[i].mask) {
+			val = readl(hdev->core->base + tbl[i].reg);
+			val = (val & ~tbl[i].mask) | (tbl[i].value & tbl[i].mask);

feels like something regmap_update_bits() already does though, I prefer this because there's less code in it.

+		}
+
+		writel(val, hdev->core->base + tbl[i].reg);
+	}

With the val declaration fix

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>



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