On 6/1/2022 2:46 AM, Dmitry Baryshkov wrote:
On Wed, 1 Jun 2022 at 01:01, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> wrote:
On 5/31/2022 5:18 AM, Dmitry Baryshkov wrote:
Replace magic register writes in msm_mdss_enable() with version that
contains less magic and more variable names that can be traced back to
the dpu_hw_catalog or the downstream dtsi files.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
drivers/gpu/drm/msm/msm_mdss.c | 79 ++++++++++++++++++++++++++++++----
1 file changed, 71 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
index 0454a571adf7..2a48263cd1b5 100644
--- a/drivers/gpu/drm/msm/msm_mdss.c
+++ b/drivers/gpu/drm/msm/msm_mdss.c
@@ -21,6 +21,7 @@
#define HW_REV 0x0
#define HW_INTR_STATUS 0x0010
+#define UBWC_DEC_HW_VERSION 0x58
#define UBWC_STATIC 0x144
#define UBWC_CTRL_2 0x150
#define UBWC_PREDICTION_MODE 0x154
@@ -132,9 +133,63 @@ static int _msm_mdss_irq_domain_add(struct msm_mdss *msm_mdss)
return 0;
}
+#define UBWC_1_0 0x10000000
+#define UBWC_2_0 0x20000000
+#define UBWC_3_0 0x30000000
+#define UBWC_4_0 0x40000000
+
+static void msm_mdss_setup_ubwc_dec_20(struct msm_mdss *msm_mdss,
+ u32 ubwc_static)
+{
+ writel_relaxed(ubwc_static, msm_mdss->mmio + UBWC_STATIC);
+}
+
+static void msm_mdss_setup_ubwc_dec_30(struct msm_mdss *msm_mdss,
+ unsigned int ubwc_version,
+ u32 ubwc_swizzle,
+ u32 highest_bank_bit,
+ u32 macrotile_mode)
+{
+ u32 value = (ubwc_swizzle & 0x1) |
+ (highest_bank_bit & 0x3) << 4 |
+ (macrotile_mode & 0x1) << 12;
+
+ if (ubwc_version == UBWC_3_0)
+ value |= BIT(10);
+
+ if (ubwc_version == UBWC_1_0)
+ value |= BIT(8);
+
+ writel_relaxed(value, msm_mdss->mmio + UBWC_STATIC);
+}
+
+static void msm_mdss_setup_ubwc_dec_40(struct msm_mdss *msm_mdss,
+ unsigned int ubwc_version,
+ u32 ubwc_swizzle,
+ u32 ubwc_static,
+ u32 highest_bank_bit,
+ u32 macrotile_mode)
+{
+ u32 value = (ubwc_swizzle & 0x7) |
+ (ubwc_static & 0x1) << 3 |
+ (highest_bank_bit & 0x7) << 4 |
+ (macrotile_mode & 0x1) << 12;
+
+ writel_relaxed(value, msm_mdss->mmio + UBWC_STATIC);
+
+ if (ubwc_version == UBWC_3_0) {
+ writel_relaxed(1, msm_mdss->mmio + UBWC_CTRL_2);
+ writel_relaxed(0, msm_mdss->mmio + UBWC_PREDICTION_MODE);
+ } else {
+ writel_relaxed(2, msm_mdss->mmio + UBWC_CTRL_2);
+ writel_relaxed(1, msm_mdss->mmio + UBWC_PREDICTION_MODE);
+ }
+}
+
Is it possible to unify the above functions by having the internal
ubwc_version checks?
Note, it's not the ubwc_version, it is the ubwc_dec_hw_version. And
also different functions take different sets of arguments.
It seems like msm_mdss_setup_ubwc_dec_xxx can keep growing.
I have not looked into each bit programming but from the top level so
feel free to correct if wrong but it seems both do write UBWC_STATIC
(different values based on different UBWC versions) and write some extra
registers based on version
This is what both the current code and the downstream do. See
https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/zeus-s-oss/techpack/display-drivers/msm/sde/sde_hw_top.c#L312
Thanks for pointing to the downstream method for this,
This is exactly what i was also suggesting to do when I mentioned
unifying the above functions.
So instead of having a separate function for each version why not handle
all the versions in the same function like what the link you have shown
does.
static int msm_mdss_enable(struct msm_mdss *msm_mdss)
{
int ret;
+ u32 hw_rev;
ret = clk_bulk_prepare_enable(msm_mdss->num_clocks, msm_mdss->clocks);
if (ret) {
@@ -149,26 +204,34 @@ static int msm_mdss_enable(struct msm_mdss *msm_mdss)
if (msm_mdss->is_mdp5)
return 0;
+ hw_rev = readl_relaxed(msm_mdss->mmio + HW_REV);
+ dev_info(msm_mdss->dev, "HW_REV: 0x%x\n", hw_rev);
+ dev_info(msm_mdss->dev, "UBWC_DEC_HW_VERSION: 0x%x\n",
+ readl_relaxed(msm_mdss->mmio + UBWC_DEC_HW_VERSION));
we are already printing the HW version here
https://gitlab.freedesktop.org/drm/msm/-/blob/msm-next/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c#L1096
Do you want to remove that print then? May be. Let me take a look.
[skipped]
