* [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support
@ 2018-01-22 15:08 ` Philippe Cornu
2018-02-02 22:19 ` Philippe CORNU
2018-02-05 13:03 ` Andrzej Hajda
0 siblings, 2 replies; 7+ messages in thread
From: Philippe Cornu @ 2018-01-22 15:08 UTC (permalink / raw)
To: Archit Taneja, Andrzej Hajda, Laurent Pinchart, David Airlie,
Philippe Cornu, Brian Norris, Benjamin Gaignard, Bhumika Goyal,
dri-devel, linux-kernel, Sandy Huang, Heiko Stubner,
linux-arm-kernel, linux-rockchip
Cc: Yannick Fertre, Vincent Abriou, Alexandre Torgue,
Maxime Coquelin, Ludovic Barre, Mickael Reulier
From: Philippe CORNU <philippe.cornu@st.com>
Add support for the Synopsys DesignWare MIPI DSI version 1.31
Two registers need to be updated/added for supporting 1.31:
* PHY_TMR_CFG 0x9c (updated)
1.30 [31:24] phy_hs2lp_time
[23:16] phy_lp2hs_time
[14: 0] max_rd_time
1.31 [25:16] phy_hs2lp_time
[ 9: 0] phy_lp2hs_time
* PHY_TMR_RD_CFG 0xf4 (new)
1.31 [14: 0] max_rd_time
Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
---
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 52 +++++++++++++++++++++++----
1 file changed, 46 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index 735f38429c06..20a2ca14a7ad 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -25,7 +25,13 @@
#include <drm/bridge/dw_mipi_dsi.h>
#include <video/mipi_display.h>
+#define HWVER_130 0x31333000 /* IP version 1.30 */
+#define HWVER_131 0x31333100 /* IP version 1.31 */
+#define HWVER_OLDEST HWVER_130
+#define HWVER_NEWEST HWVER_131
+
#define DSI_VERSION 0x00
+#define VERSION GENMASK(31, 8)
#define DSI_PWR_UP 0x04
#define RESET 0
@@ -161,11 +167,12 @@
#define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16)
#define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff)
-/* TODO Next register is slightly different between 1.30 & 1.31 IP version */
#define DSI_PHY_TMR_CFG 0x9c
-#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24)
-#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16)
-#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff)
+#define PHY_HS2LP_TIME_V130(lbcc) (((lbcc) & 0xff) << 24)
+#define PHY_LP2HS_TIME_V130(lbcc) (((lbcc) & 0xff) << 16)
+#define MAX_RD_TIME_V130(lbcc) ((lbcc) & 0x7fff)
+#define PHY_HS2LP_TIME_V131(lbcc) (((lbcc) & 0x3ff) << 16)
+#define PHY_LP2HS_TIME_V131(lbcc) ((lbcc) & 0x3ff)
#define DSI_PHY_RSTZ 0xa0
#define PHY_DISFORCEPLL 0
@@ -204,7 +211,9 @@
#define DSI_INT_ST1 0xc0
#define DSI_INT_MSK0 0xc4
#define DSI_INT_MSK1 0xc8
+
#define DSI_PHY_TMR_RD_CFG 0xf4
+#define MAX_RD_TIME_V131(lbcc) ((lbcc) & 0x7fff)
#define PHY_STATUS_TIMEOUT_US 10000
#define CMD_PKT_STATUS_TIMEOUT_US 20000
@@ -215,6 +224,7 @@ struct dw_mipi_dsi {
struct drm_bridge *panel_bridge;
struct device *dev;
void __iomem *base;
+ u32 hw_version;
struct clk *pclk;
struct clk *px_clk;
@@ -616,8 +626,14 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
* note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
* DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
*/
- dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
- | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
+ if (dsi->hw_version == HWVER_131) {
+ dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
+ PHY_LP2HS_TIME_V131(0x40));
+ dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
+ } else {
+ dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V130(0x40) |
+ PHY_LP2HS_TIME_V130(0x40) | MAX_RD_TIME_V130(10000));
+ }
dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
| PHY_CLKLP2HS_TIME(0x40));
@@ -791,6 +807,28 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
.attach = dw_mipi_dsi_bridge_attach,
};
+static void dsi_get_version(struct dw_mipi_dsi *dsi)
+{
+ u32 hw_version;
+
+ clk_prepare_enable(dsi->pclk);
+ hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
+ clk_disable_unprepare(dsi->pclk);
+
+ if (hw_version > HWVER_NEWEST) {
+ DRM_DEBUG("hw version: use 0x%08x for this recent 0x%08x\n",
+ HWVER_NEWEST, hw_version);
+ hw_version = HWVER_NEWEST;
+
+ } else if (hw_version < HWVER_OLDEST) {
+ DRM_DEBUG("hw version: use 0x%08x for this old 0x%08x\n",
+ HWVER_OLDEST, hw_version);
+ hw_version = HWVER_OLDEST;
+ }
+
+ dsi->hw_version = hw_version;
+}
+
static struct dw_mipi_dsi *
__dw_mipi_dsi_probe(struct platform_device *pdev,
const struct dw_mipi_dsi_plat_data *plat_data)
@@ -870,6 +908,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
clk_disable_unprepare(dsi->pclk);
}
+ dsi_get_version(dsi);
+
pm_runtime_enable(dev);
dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
--
2.15.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support
2018-01-22 15:08 ` [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support Philippe Cornu
@ 2018-02-02 22:19 ` Philippe CORNU
2018-02-04 15:13 ` Archit
2018-02-06 1:43 ` Brian Norris
2018-02-05 13:03 ` Andrzej Hajda
1 sibling, 2 replies; 7+ messages in thread
From: Philippe CORNU @ 2018-02-02 22:19 UTC (permalink / raw)
To: Archit Taneja, Andrzej Hajda, Laurent Pinchart, David Airlie,
Brian Norris, Benjamin Gaignard, Bhumika Goyal, dri-devel,
linux-kernel, Sandy Huang, Heiko Stubner, linux-arm-kernel,
linux-rockchip
Cc: Yannick FERTRE, Vincent ABRIOU, Alexandre TORGUE,
Maxime Coquelin, Ludovic BARRE, Mickael REULIER
Hi Archit, Andrzej, Laurent & Brian,
What is your opinion regarding this patch? Do you have any advice for
handling hw versions?
Do not hesitate to comment.
Many thanks,
Philippe :-)
On 01/22/2018 04:08 PM, Philippe Cornu wrote:
> From: Philippe CORNU <philippe.cornu@st.com>
>
> Add support for the Synopsys DesignWare MIPI DSI version 1.31
> Two registers need to be updated/added for supporting 1.31:
> * PHY_TMR_CFG 0x9c (updated)
> 1.30 [31:24] phy_hs2lp_time
> [23:16] phy_lp2hs_time
> [14: 0] max_rd_time
>
> 1.31 [25:16] phy_hs2lp_time
> [ 9: 0] phy_lp2hs_time
>
> * PHY_TMR_RD_CFG 0xf4 (new)
> 1.31 [14: 0] max_rd_time
>
> Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
> ---
> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 52 +++++++++++++++++++++++----
> 1 file changed, 46 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index 735f38429c06..20a2ca14a7ad 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -25,7 +25,13 @@
> #include <drm/bridge/dw_mipi_dsi.h>
> #include <video/mipi_display.h>
>
> +#define HWVER_130 0x31333000 /* IP version 1.30 */
> +#define HWVER_131 0x31333100 /* IP version 1.31 */
> +#define HWVER_OLDEST HWVER_130
> +#define HWVER_NEWEST HWVER_131
> +
> #define DSI_VERSION 0x00
> +#define VERSION GENMASK(31, 8)
>
> #define DSI_PWR_UP 0x04
> #define RESET 0
> @@ -161,11 +167,12 @@
> #define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16)
> #define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff)
>
> -/* TODO Next register is slightly different between 1.30 & 1.31 IP version */
> #define DSI_PHY_TMR_CFG 0x9c
> -#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24)
> -#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16)
> -#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff)
> +#define PHY_HS2LP_TIME_V130(lbcc) (((lbcc) & 0xff) << 24)
> +#define PHY_LP2HS_TIME_V130(lbcc) (((lbcc) & 0xff) << 16)
> +#define MAX_RD_TIME_V130(lbcc) ((lbcc) & 0x7fff)
> +#define PHY_HS2LP_TIME_V131(lbcc) (((lbcc) & 0x3ff) << 16)
> +#define PHY_LP2HS_TIME_V131(lbcc) ((lbcc) & 0x3ff)
>
> #define DSI_PHY_RSTZ 0xa0
> #define PHY_DISFORCEPLL 0
> @@ -204,7 +211,9 @@
> #define DSI_INT_ST1 0xc0
> #define DSI_INT_MSK0 0xc4
> #define DSI_INT_MSK1 0xc8
> +
> #define DSI_PHY_TMR_RD_CFG 0xf4
> +#define MAX_RD_TIME_V131(lbcc) ((lbcc) & 0x7fff)
>
> #define PHY_STATUS_TIMEOUT_US 10000
> #define CMD_PKT_STATUS_TIMEOUT_US 20000
> @@ -215,6 +224,7 @@ struct dw_mipi_dsi {
> struct drm_bridge *panel_bridge;
> struct device *dev;
> void __iomem *base;
> + u32 hw_version;
>
> struct clk *pclk;
> struct clk *px_clk;
> @@ -616,8 +626,14 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
> * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
> * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
> */
> - dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
> - | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
> + if (dsi->hw_version == HWVER_131) {
> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
> + PHY_LP2HS_TIME_V131(0x40));
> + dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
> + } else {
> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V130(0x40) |
> + PHY_LP2HS_TIME_V130(0x40) | MAX_RD_TIME_V130(10000));
> + }
>
> dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
> | PHY_CLKLP2HS_TIME(0x40));
> @@ -791,6 +807,28 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
> .attach = dw_mipi_dsi_bridge_attach,
> };
>
> +static void dsi_get_version(struct dw_mipi_dsi *dsi)
> +{
> + u32 hw_version;
> +
> + clk_prepare_enable(dsi->pclk);
> + hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
> + clk_disable_unprepare(dsi->pclk);
> +
> + if (hw_version > HWVER_NEWEST) {
> + DRM_DEBUG("hw version: use 0x%08x for this recent 0x%08x\n",
> + HWVER_NEWEST, hw_version);
> + hw_version = HWVER_NEWEST;
> +
> + } else if (hw_version < HWVER_OLDEST) {
> + DRM_DEBUG("hw version: use 0x%08x for this old 0x%08x\n",
> + HWVER_OLDEST, hw_version);
> + hw_version = HWVER_OLDEST;
> + }
> +
> + dsi->hw_version = hw_version;
> +}
> +
> static struct dw_mipi_dsi *
> __dw_mipi_dsi_probe(struct platform_device *pdev,
> const struct dw_mipi_dsi_plat_data *plat_data)
> @@ -870,6 +908,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
> clk_disable_unprepare(dsi->pclk);
> }
>
> + dsi_get_version(dsi);
> +
> pm_runtime_enable(dev);
>
> dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support
2018-02-02 22:19 ` Philippe CORNU
@ 2018-02-04 15:13 ` Archit
2018-02-04 20:34 ` Philippe CORNU
2018-02-06 1:43 ` Brian Norris
1 sibling, 1 reply; 7+ messages in thread
From: Archit @ 2018-02-04 15:13 UTC (permalink / raw)
To: Philippe CORNU, David Airlie, Brian Norris, Benjamin Gaignard,
Bhumika Goyal, dri-devel, linux-kernel, Sandy Huang,
Heiko Stubner, linux-arm-kernel, linux-rockchip
Cc: Andrzej Hajda, Laurent Pinchart, Yannick FERTRE, Vincent ABRIOU,
Alexandre TORGUE, Maxime Coquelin, Ludovic BARRE,
Mickael REULIER
Hi Phillipe,
On Saturday 03 February 2018 03:49 AM, Philippe CORNU wrote:
> Hi Archit, Andrzej, Laurent & Brian,
>
> What is your opinion regarding this patch? Do you have any advice for
> handling hw versions?
>
> Do not hesitate to comment.
The patch looks mostly good to me. One query below.
>
> Many thanks,
> Philippe :-)
>
>
> On 01/22/2018 04:08 PM, Philippe Cornu wrote:
>> From: Philippe CORNU <philippe.cornu@st.com>
>>
>> Add support for the Synopsys DesignWare MIPI DSI version 1.31
>> Two registers need to be updated/added for supporting 1.31:
>> * PHY_TMR_CFG 0x9c (updated)
>> 1.30 [31:24] phy_hs2lp_time
>> [23:16] phy_lp2hs_time
>> [14: 0] max_rd_time
>>
>> 1.31 [25:16] phy_hs2lp_time
>> [ 9: 0] phy_lp2hs_time
>>
>> * PHY_TMR_RD_CFG 0xf4 (new)
>> 1.31 [14: 0] max_rd_time
>>
>> Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
>> ---
>> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 52 +++++++++++++++++++++++----
>> 1 file changed, 46 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> index 735f38429c06..20a2ca14a7ad 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> @@ -25,7 +25,13 @@
>> #include <drm/bridge/dw_mipi_dsi.h>
>> #include <video/mipi_display.h>
>>
>> +#define HWVER_130 0x31333000 /* IP version 1.30 */
>> +#define HWVER_131 0x31333100 /* IP version 1.31 */
>> +#define HWVER_OLDEST HWVER_130
>> +#define HWVER_NEWEST HWVER_131
>> +
>> #define DSI_VERSION 0x00
>> +#define VERSION GENMASK(31, 8)
>>
>> #define DSI_PWR_UP 0x04
>> #define RESET 0
>> @@ -161,11 +167,12 @@
>> #define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16)
>> #define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff)
>>
>> -/* TODO Next register is slightly different between 1.30 & 1.31 IP version */
>> #define DSI_PHY_TMR_CFG 0x9c
>> -#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24)
>> -#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16)
>> -#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff)
>> +#define PHY_HS2LP_TIME_V130(lbcc) (((lbcc) & 0xff) << 24)
>> +#define PHY_LP2HS_TIME_V130(lbcc) (((lbcc) & 0xff) << 16)
>> +#define MAX_RD_TIME_V130(lbcc) ((lbcc) & 0x7fff)
>> +#define PHY_HS2LP_TIME_V131(lbcc) (((lbcc) & 0x3ff) << 16)
>> +#define PHY_LP2HS_TIME_V131(lbcc) ((lbcc) & 0x3ff)
>>
>> #define DSI_PHY_RSTZ 0xa0
>> #define PHY_DISFORCEPLL 0
>> @@ -204,7 +211,9 @@
>> #define DSI_INT_ST1 0xc0
>> #define DSI_INT_MSK0 0xc4
>> #define DSI_INT_MSK1 0xc8
>> +
>> #define DSI_PHY_TMR_RD_CFG 0xf4
>> +#define MAX_RD_TIME_V131(lbcc) ((lbcc) & 0x7fff)
>>
>> #define PHY_STATUS_TIMEOUT_US 10000
>> #define CMD_PKT_STATUS_TIMEOUT_US 20000
>> @@ -215,6 +224,7 @@ struct dw_mipi_dsi {
>> struct drm_bridge *panel_bridge;
>> struct device *dev;
>> void __iomem *base;
>> + u32 hw_version;
>>
>> struct clk *pclk;
>> struct clk *px_clk;
>> @@ -616,8 +626,14 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>> * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
>> * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
>> */
>> - dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
>> - | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
>> + if (dsi->hw_version == HWVER_131) {
>> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
>> + PHY_LP2HS_TIME_V131(0x40));
>> + dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
>> + } else {
>> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V130(0x40) |
>> + PHY_LP2HS_TIME_V130(0x40) | MAX_RD_TIME_V130(10000));
>> + }
>>
>> dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
>> | PHY_CLKLP2HS_TIME(0x40));
>> @@ -791,6 +807,28 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
>> .attach = dw_mipi_dsi_bridge_attach,
>> };
>>
>> +static void dsi_get_version(struct dw_mipi_dsi *dsi)
>> +{
>> + u32 hw_version;
>> +
>> + clk_prepare_enable(dsi->pclk);
>> + hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
>> + clk_disable_unprepare(dsi->pclk);
>> +
>> + if (hw_version > HWVER_NEWEST) {
>> + DRM_DEBUG("hw version: use 0x%08x for this recent 0x%08x\n",
>> + HWVER_NEWEST, hw_version);
>> + hw_version = HWVER_NEWEST;
>> +
>> + } else if (hw_version < HWVER_OLDEST) {
>> + DRM_DEBUG("hw version: use 0x%08x for this old 0x%08x\n",
>> + HWVER_OLDEST, hw_version);
>> + hw_version = HWVER_OLDEST;
I didn't understand the point of HWVER_NEWEST and HWVWER_OLDEST. We're
not going to have a huge number of hw versions that we need to check if
our version lies within a range. We should rather have a switch case
which explicitly sets the hw_version vale based on what we read from
the DSI_VERSION register.
The patch looks fine otherwise.
Thanks,
Archit
>> + }
>> +
>> + dsi->hw_version = hw_version;
>> +}
>> +
>> static struct dw_mipi_dsi *
>> __dw_mipi_dsi_probe(struct platform_device *pdev,
>> const struct dw_mipi_dsi_plat_data *plat_data)
>> @@ -870,6 +908,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>> clk_disable_unprepare(dsi->pclk);
>> }
>>
>> + dsi_get_version(dsi);
>> +
>> pm_runtime_enable(dev);
>>
>> dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support
2018-02-04 15:13 ` Archit
@ 2018-02-04 20:34 ` Philippe CORNU
0 siblings, 0 replies; 7+ messages in thread
From: Philippe CORNU @ 2018-02-04 20:34 UTC (permalink / raw)
To: Archit, David Airlie, Brian Norris, Benjamin Gaignard,
Bhumika Goyal, dri-devel, linux-kernel, Sandy Huang,
Heiko Stubner, linux-arm-kernel, linux-rockchip
Cc: Andrzej Hajda, Laurent Pinchart, Yannick FERTRE, Vincent ABRIOU,
Alexandre TORGUE, Maxime Coquelin, Ludovic BARRE,
Mickael REULIER
Hi Archit,
and many thanks for your comments
On 02/04/2018 04:13 PM, Archit wrote:
> Hi Phillipe,
>
> On Saturday 03 February 2018 03:49 AM, Philippe CORNU wrote:
>> Hi Archit, Andrzej, Laurent & Brian,
>>
>> What is your opinion regarding this patch? Do you have any advice for
>> handling hw versions?
>>
>> Do not hesitate to comment.
>
> The patch looks mostly good to me. One query below.
>
>>
>> Many thanks,
>> Philippe :-)
>>
>>
>> On 01/22/2018 04:08 PM, Philippe Cornu wrote:
>>> From: Philippe CORNU <philippe.cornu@st.com>
>>>
>>> Add support for the Synopsys DesignWare MIPI DSI version 1.31
>>> Two registers need to be updated/added for supporting 1.31:
>>> * PHY_TMR_CFG 0x9c (updated)
>>> 1.30 [31:24] phy_hs2lp_time
>>> [23:16] phy_lp2hs_time
>>> [14: 0] max_rd_time
>>>
>>> 1.31 [25:16] phy_hs2lp_time
>>> [ 9: 0] phy_lp2hs_time
>>>
>>> * PHY_TMR_RD_CFG 0xf4 (new)
>>> 1.31 [14: 0] max_rd_time
>>>
>>> Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
>>> ---
>>> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 52
>>> +++++++++++++++++++++++----
>>> 1 file changed, 46 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>> b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>> index 735f38429c06..20a2ca14a7ad 100644
>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>>> @@ -25,7 +25,13 @@
>>> #include <drm/bridge/dw_mipi_dsi.h>
>>> #include <video/mipi_display.h>
>>> +#define HWVER_130 0x31333000 /* IP version 1.30 */
>>> +#define HWVER_131 0x31333100 /* IP version 1.31 */
>>> +#define HWVER_OLDEST HWVER_130
>>> +#define HWVER_NEWEST HWVER_131
>>> +
>>> #define DSI_VERSION 0x00
>>> +#define VERSION GENMASK(31, 8)
>>> #define DSI_PWR_UP 0x04
>>> #define RESET 0
>>> @@ -161,11 +167,12 @@
>>> #define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16)
>>> #define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff)
>>> -/* TODO Next register is slightly different between 1.30 & 1.31 IP
>>> version */
>>> #define DSI_PHY_TMR_CFG 0x9c
>>> -#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24)
>>> -#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16)
>>> -#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff)
>>> +#define PHY_HS2LP_TIME_V130(lbcc) (((lbcc) & 0xff) << 24)
>>> +#define PHY_LP2HS_TIME_V130(lbcc) (((lbcc) & 0xff) << 16)
>>> +#define MAX_RD_TIME_V130(lbcc) ((lbcc) & 0x7fff)
>>> +#define PHY_HS2LP_TIME_V131(lbcc) (((lbcc) & 0x3ff) << 16)
>>> +#define PHY_LP2HS_TIME_V131(lbcc) ((lbcc) & 0x3ff)
>>> #define DSI_PHY_RSTZ 0xa0
>>> #define PHY_DISFORCEPLL 0
>>> @@ -204,7 +211,9 @@
>>> #define DSI_INT_ST1 0xc0
>>> #define DSI_INT_MSK0 0xc4
>>> #define DSI_INT_MSK1 0xc8
>>> +
>>> #define DSI_PHY_TMR_RD_CFG 0xf4
>>> +#define MAX_RD_TIME_V131(lbcc) ((lbcc) & 0x7fff)
>>> #define PHY_STATUS_TIMEOUT_US 10000
>>> #define CMD_PKT_STATUS_TIMEOUT_US 20000
>>> @@ -215,6 +224,7 @@ struct dw_mipi_dsi {
>>> struct drm_bridge *panel_bridge;
>>> struct device *dev;
>>> void __iomem *base;
>>> + u32 hw_version;
>>> struct clk *pclk;
>>> struct clk *px_clk;
>>> @@ -616,8 +626,14 @@ static void
>>> dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>>> * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
>>> * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
>>> */
>>> - dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
>>> - | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
>>> + if (dsi->hw_version == HWVER_131) {
>>> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
>>> + PHY_LP2HS_TIME_V131(0x40));
>>> + dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
>>> + } else {
>>> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V130(0x40) |
>>> + PHY_LP2HS_TIME_V130(0x40) | MAX_RD_TIME_V130(10000));
>>> + }
>>> dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
>>> | PHY_CLKLP2HS_TIME(0x40));
>>> @@ -791,6 +807,28 @@ static const struct drm_bridge_funcs
>>> dw_mipi_dsi_bridge_funcs = {
>>> .attach = dw_mipi_dsi_bridge_attach,
>>> };
>>> +static void dsi_get_version(struct dw_mipi_dsi *dsi)
>>> +{
>>> + u32 hw_version;
>>> +
>>> + clk_prepare_enable(dsi->pclk);
>>> + hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
>>> + clk_disable_unprepare(dsi->pclk);
>>> +
>>> + if (hw_version > HWVER_NEWEST) {
>>> + DRM_DEBUG("hw version: use 0x%08x for this recent 0x%08x\n",
>>> + HWVER_NEWEST, hw_version);
>>> + hw_version = HWVER_NEWEST;
>>> +
>>> + } else if (hw_version < HWVER_OLDEST) {
>>> + DRM_DEBUG("hw version: use 0x%08x for this old 0x%08x\n",
>>> + HWVER_OLDEST, hw_version);
>>> + hw_version = HWVER_OLDEST;
>
> I didn't understand the point of HWVER_NEWEST and HWVWER_OLDEST. We're
> not going to have a huge number of hw versions that we need to check if
> our version lies within a range. We should rather have a switch case
> which explicitly sets the hw_version vale based on what we read from
> the DSI_VERSION register.
>
I totally understand your comment : )
My first implementation used a switch case with the 1.30 and 1.31
versions (the 2 versions use by stm32). But default case was difficult
to choose... Moreover, this patch with switch cases may be not
compatible with rockchip if rockchip chipsets have older version than
1.30 and I really did not want to push a patch that could break rockchip
driver!
I do not know the dw dsi versions of rockchip, neither those of
hisilicon nor those of imx... Anyway, I put the 1.30 version into the
default case... But then I did not know how to manage newer versions
(after 1.31)...
At the end, I pushed this patch with version number comparisons and
oldest/newest stuffs because I am sure Rockchip driver will continue to
work with it : )
If you prefer and as you suggested, I can push a patch with switch cases
using 1.30 as the default version, it will work with actual rockchip
driver too.
I will wait for more feedbacks (especially from Brian & Rockchip team)
and do not hesitate to comment my comments.
Many thanks,
Philippe :-)
> The patch looks fine otherwise.
>
> Thanks,
> Archit
>
>>> + }
>>> +
>>> + dsi->hw_version = hw_version;
>>> +}
>>> +
>>> static struct dw_mipi_dsi *
>>> __dw_mipi_dsi_probe(struct platform_device *pdev,
>>> const struct dw_mipi_dsi_plat_data *plat_data)
>>> @@ -870,6 +908,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>>> clk_disable_unprepare(dsi->pclk);
>>> }
>>> + dsi_get_version(dsi);
>>> +
>>> pm_runtime_enable(dev);
>>> dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support
2018-01-22 15:08 ` [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support Philippe Cornu
2018-02-02 22:19 ` Philippe CORNU
@ 2018-02-05 13:03 ` Andrzej Hajda
2018-02-05 14:59 ` Philippe CORNU
1 sibling, 1 reply; 7+ messages in thread
From: Andrzej Hajda @ 2018-02-05 13:03 UTC (permalink / raw)
To: Philippe Cornu, Archit Taneja, Laurent Pinchart, David Airlie,
Brian Norris, Benjamin Gaignard, Bhumika Goyal, dri-devel,
linux-kernel, Sandy Huang, Heiko Stubner, linux-arm-kernel,
linux-rockchip
Cc: Yannick Fertre, Vincent Abriou, Alexandre Torgue,
Maxime Coquelin, Ludovic Barre, Mickael Reulier
On 22.01.2018 16:08, Philippe Cornu wrote:
> From: Philippe CORNU <philippe.cornu@st.com>
>
> Add support for the Synopsys DesignWare MIPI DSI version 1.31
> Two registers need to be updated/added for supporting 1.31:
> * PHY_TMR_CFG 0x9c (updated)
> 1.30 [31:24] phy_hs2lp_time
> [23:16] phy_lp2hs_time
> [14: 0] max_rd_time
>
> 1.31 [25:16] phy_hs2lp_time
> [ 9: 0] phy_lp2hs_time
>
> * PHY_TMR_RD_CFG 0xf4 (new)
> 1.31 [14: 0] max_rd_time
>
> Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
> ---
> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 52 +++++++++++++++++++++++----
> 1 file changed, 46 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index 735f38429c06..20a2ca14a7ad 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -25,7 +25,13 @@
> #include <drm/bridge/dw_mipi_dsi.h>
> #include <video/mipi_display.h>
>
> +#define HWVER_130 0x31333000 /* IP version 1.30 */
> +#define HWVER_131 0x31333100 /* IP version 1.31 */
> +#define HWVER_OLDEST HWVER_130
> +#define HWVER_NEWEST HWVER_131
> +
> #define DSI_VERSION 0x00
> +#define VERSION GENMASK(31, 8)
>
> #define DSI_PWR_UP 0x04
> #define RESET 0
> @@ -161,11 +167,12 @@
> #define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16)
> #define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff)
>
> -/* TODO Next register is slightly different between 1.30 & 1.31 IP version */
> #define DSI_PHY_TMR_CFG 0x9c
> -#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24)
> -#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16)
> -#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff)
> +#define PHY_HS2LP_TIME_V130(lbcc) (((lbcc) & 0xff) << 24)
> +#define PHY_LP2HS_TIME_V130(lbcc) (((lbcc) & 0xff) << 16)
> +#define MAX_RD_TIME_V130(lbcc) ((lbcc) & 0x7fff)
> +#define PHY_HS2LP_TIME_V131(lbcc) (((lbcc) & 0x3ff) << 16)
> +#define PHY_LP2HS_TIME_V131(lbcc) ((lbcc) & 0x3ff)
>
> #define DSI_PHY_RSTZ 0xa0
> #define PHY_DISFORCEPLL 0
> @@ -204,7 +211,9 @@
> #define DSI_INT_ST1 0xc0
> #define DSI_INT_MSK0 0xc4
> #define DSI_INT_MSK1 0xc8
> +
> #define DSI_PHY_TMR_RD_CFG 0xf4
> +#define MAX_RD_TIME_V131(lbcc) ((lbcc) & 0x7fff)
>
> #define PHY_STATUS_TIMEOUT_US 10000
> #define CMD_PKT_STATUS_TIMEOUT_US 20000
> @@ -215,6 +224,7 @@ struct dw_mipi_dsi {
> struct drm_bridge *panel_bridge;
> struct device *dev;
> void __iomem *base;
> + u32 hw_version;
>
> struct clk *pclk;
> struct clk *px_clk;
> @@ -616,8 +626,14 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
> * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
> * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
> */
> - dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
> - | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
> + if (dsi->hw_version == HWVER_131) {
> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
> + PHY_LP2HS_TIME_V131(0x40));
> + dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
> + } else {
> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V130(0x40) |
> + PHY_LP2HS_TIME_V130(0x40) | MAX_RD_TIME_V130(10000));
> + }
>
> dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
> | PHY_CLKLP2HS_TIME(0x40));
> @@ -791,6 +807,28 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
> .attach = dw_mipi_dsi_bridge_attach,
> };
>
> +static void dsi_get_version(struct dw_mipi_dsi *dsi)
> +{
> + u32 hw_version;
> +
> + clk_prepare_enable(dsi->pclk);
> + hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
> + clk_disable_unprepare(dsi->pclk);
> +
> + if (hw_version > HWVER_NEWEST) {
> + DRM_DEBUG("hw version: use 0x%08x for this recent 0x%08x\n",
> + HWVER_NEWEST, hw_version);
> + hw_version = HWVER_NEWEST;
> +
> + } else if (hw_version < HWVER_OLDEST) {
> + DRM_DEBUG("hw version: use 0x%08x for this old 0x%08x\n",
> + HWVER_OLDEST, hw_version);
> + hw_version = HWVER_OLDEST;
> + }
> +
> + dsi->hw_version = hw_version;
> +}
> +
> static struct dw_mipi_dsi *
> __dw_mipi_dsi_probe(struct platform_device *pdev,
> const struct dw_mipi_dsi_plat_data *plat_data)
> @@ -870,6 +908,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
> clk_disable_unprepare(dsi->pclk);
> }
>
> + dsi_get_version(dsi);
> +
> pm_runtime_enable(dev);
Two questions:
1. You have generally two variants:
- older than 131,
- not older than 131.
Wouldn't be better to just assume that since 131 registers slightly differ?
So you just stores:
dsi->hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
And if neccessary performs comparison:
if (dsi->hw_version >= HWVER_131)
...
else
...
This way you can remove these HWVER_(NEWEST|OLDEST).
2. You are using pm_runtime, but not in dsi_get_version. I guess it is
SoC dependant but I suppose performing registry read should be safer
after runtime_get.
Regards
Andrzej
>
> dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support
2018-02-05 13:03 ` Andrzej Hajda
@ 2018-02-05 14:59 ` Philippe CORNU
0 siblings, 0 replies; 7+ messages in thread
From: Philippe CORNU @ 2018-02-05 14:59 UTC (permalink / raw)
To: Andrzej Hajda, Archit Taneja, Laurent Pinchart, David Airlie,
Brian Norris, Benjamin Gaignard, Bhumika Goyal, dri-devel,
linux-kernel, Sandy Huang, Heiko Stubner, linux-arm-kernel,
linux-rockchip
Cc: Yannick FERTRE, Vincent ABRIOU, Alexandre TORGUE,
Maxime Coquelin, Ludovic BARRE, Mickael REULIER
Hi Andrzej,
And many thanks for your good comments
On 02/05/2018 02:03 PM, Andrzej Hajda wrote:
> On 22.01.2018 16:08, Philippe Cornu wrote:
>> From: Philippe CORNU <philippe.cornu@st.com>
>>
>> Add support for the Synopsys DesignWare MIPI DSI version 1.31
>> Two registers need to be updated/added for supporting 1.31:
>> * PHY_TMR_CFG 0x9c (updated)
>> 1.30 [31:24] phy_hs2lp_time
>> [23:16] phy_lp2hs_time
>> [14: 0] max_rd_time
>>
>> 1.31 [25:16] phy_hs2lp_time
>> [ 9: 0] phy_lp2hs_time
>>
>> * PHY_TMR_RD_CFG 0xf4 (new)
>> 1.31 [14: 0] max_rd_time
>>
>> Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
>> ---
>> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 52 +++++++++++++++++++++++----
>> 1 file changed, 46 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> index 735f38429c06..20a2ca14a7ad 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> @@ -25,7 +25,13 @@
>> #include <drm/bridge/dw_mipi_dsi.h>
>> #include <video/mipi_display.h>
>>
>> +#define HWVER_130 0x31333000 /* IP version 1.30 */
>> +#define HWVER_131 0x31333100 /* IP version 1.31 */
>> +#define HWVER_OLDEST HWVER_130
>> +#define HWVER_NEWEST HWVER_131
>> +
>> #define DSI_VERSION 0x00
>> +#define VERSION GENMASK(31, 8)
>>
>> #define DSI_PWR_UP 0x04
>> #define RESET 0
>> @@ -161,11 +167,12 @@
>> #define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16)
>> #define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff)
>>
>> -/* TODO Next register is slightly different between 1.30 & 1.31 IP version */
>> #define DSI_PHY_TMR_CFG 0x9c
>> -#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24)
>> -#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16)
>> -#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff)
>> +#define PHY_HS2LP_TIME_V130(lbcc) (((lbcc) & 0xff) << 24)
>> +#define PHY_LP2HS_TIME_V130(lbcc) (((lbcc) & 0xff) << 16)
>> +#define MAX_RD_TIME_V130(lbcc) ((lbcc) & 0x7fff)
>> +#define PHY_HS2LP_TIME_V131(lbcc) (((lbcc) & 0x3ff) << 16)
>> +#define PHY_LP2HS_TIME_V131(lbcc) ((lbcc) & 0x3ff)
>>
>> #define DSI_PHY_RSTZ 0xa0
>> #define PHY_DISFORCEPLL 0
>> @@ -204,7 +211,9 @@
>> #define DSI_INT_ST1 0xc0
>> #define DSI_INT_MSK0 0xc4
>> #define DSI_INT_MSK1 0xc8
>> +
>> #define DSI_PHY_TMR_RD_CFG 0xf4
>> +#define MAX_RD_TIME_V131(lbcc) ((lbcc) & 0x7fff)
>>
>> #define PHY_STATUS_TIMEOUT_US 10000
>> #define CMD_PKT_STATUS_TIMEOUT_US 20000
>> @@ -215,6 +224,7 @@ struct dw_mipi_dsi {
>> struct drm_bridge *panel_bridge;
>> struct device *dev;
>> void __iomem *base;
>> + u32 hw_version;
>>
>> struct clk *pclk;
>> struct clk *px_clk;
>> @@ -616,8 +626,14 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>> * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
>> * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
>> */
>> - dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
>> - | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
>> + if (dsi->hw_version == HWVER_131) {
>> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
>> + PHY_LP2HS_TIME_V131(0x40));
>> + dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
>> + } else {
>> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V130(0x40) |
>> + PHY_LP2HS_TIME_V130(0x40) | MAX_RD_TIME_V130(10000));
>> + }
>>
>> dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
>> | PHY_CLKLP2HS_TIME(0x40));
>> @@ -791,6 +807,28 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
>> .attach = dw_mipi_dsi_bridge_attach,
>> };
>>
>> +static void dsi_get_version(struct dw_mipi_dsi *dsi)
>> +{
>> + u32 hw_version;
>> +
>> + clk_prepare_enable(dsi->pclk);
>> + hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
>> + clk_disable_unprepare(dsi->pclk);
>> +
>> + if (hw_version > HWVER_NEWEST) {
>> + DRM_DEBUG("hw version: use 0x%08x for this recent 0x%08x\n",
>> + HWVER_NEWEST, hw_version);
>> + hw_version = HWVER_NEWEST;
>> +
>> + } else if (hw_version < HWVER_OLDEST) {
>> + DRM_DEBUG("hw version: use 0x%08x for this old 0x%08x\n",
>> + HWVER_OLDEST, hw_version);
>> + hw_version = HWVER_OLDEST;
>> + }
>> +
>> + dsi->hw_version = hw_version;
>> +}
>> +
>> static struct dw_mipi_dsi *
>> __dw_mipi_dsi_probe(struct platform_device *pdev,
>> const struct dw_mipi_dsi_plat_data *plat_data)
>> @@ -870,6 +908,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>> clk_disable_unprepare(dsi->pclk);
>> }
>>
>> + dsi_get_version(dsi);
>> +
>> pm_runtime_enable(dev);
>
> Two questions:
> 1. You have generally two variants:
> - older than 131,
> - not older than 131.
> Wouldn't be better to just assume that since 131 registers slightly differ?
> So you just stores:
> dsi->hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
> And if neccessary performs comparison:
> if (dsi->hw_version >= HWVER_131)
> ...
> else
> ...
>
> This way you can remove these HWVER_(NEWEST|OLDEST).
>
Archit & you are right, my code is too complex for at the end only 2
different reg writes for the 1.31 version :)
I will follow all your good tips to simplify the code.
> 2. You are using pm_runtime, but not in dsi_get_version. I guess it is
> SoC dependant but I suppose performing registry read should be safer
> after runtime_get.
>
> Regards
> Andrzej
>
dsi_get_version() is called only once and just before pm_runtime_enable().
Anyway, I think this function is not required anymore as there is only
one place where we need to take care of the 1.31 version.
Many thanks,
Philippe :-)
>>
>> dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
>
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support
2018-02-02 22:19 ` Philippe CORNU
2018-02-04 15:13 ` Archit
@ 2018-02-06 1:43 ` Brian Norris
1 sibling, 0 replies; 7+ messages in thread
From: Brian Norris @ 2018-02-06 1:43 UTC (permalink / raw)
To: Philippe CORNU
Cc: Archit Taneja, Andrzej Hajda, Laurent Pinchart, David Airlie,
Benjamin Gaignard, Bhumika Goyal, dri-devel, linux-kernel,
Sandy Huang, Heiko Stubner, linux-arm-kernel, linux-rockchip,
Yannick FERTRE, Vincent ABRIOU, Alexandre TORGUE,
Maxime Coquelin, Ludovic BARRE, Mickael REULIER
On Fri, Feb 02, 2018 at 10:19:15PM +0000, Philippe CORNU wrote:
> Hi Archit, Andrzej, Laurent & Brian,
>
> What is your opinion regarding this patch? Do you have any advice for
> handling hw versions?
>
> Do not hesitate to comment.
I'll admit, I don't really have the bandwidth to handle this. I also
haven't looked into any version diffs to know the extent of changes
between HW versions.
Brian
^ permalink raw reply [flat|nested] 7+ messages in thread
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[not found] <CGME20180122150916epcas5p14fc276bc3320d82685b3c19dd62f5273@epcas5p1.samsung.com>
2018-01-22 15:08 ` [PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support Philippe Cornu
2018-02-02 22:19 ` Philippe CORNU
2018-02-04 15:13 ` Archit
2018-02-04 20:34 ` Philippe CORNU
2018-02-06 1:43 ` Brian Norris
2018-02-05 13:03 ` Andrzej Hajda
2018-02-05 14:59 ` Philippe CORNU
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