OMAPDSS: tpo-td043 panel: fix data passing between SPI/DSS parts

This driver uses omap_dss_device that it gets from a board file through
SPI platfrom_data pointer to pass data from SPI to DSS portion of the
driver by using dev_set_drvdata(). However this trick no longer works,
as DSS core no longer uses omap_dss_device from a board file to create
the real device, so use a global pointer to accomplish this instead,
like other SPI panel drivers do.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/omap2/displays/panel-tpo-td043mtea1.c b/drivers/video/omap2/displays/panel-tpo-td043mtea1.c
index 6b66439..048c983 100644 (file)
--- a/drivers/video/omap2/displays/panel-tpo-td043mtea1.c
+++ b/drivers/video/omap2/displays/panel-tpo-td043mtea1.c
@@ -63,6 +63,9 @@ struct tpo_td043_device {
        u32 power_on_resume:1;
 };
 
+/* used to pass spi_device from SPI to DSS portion of the driver */
+static struct tpo_td043_device *g_tpo_td043;
+
 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
 {
        struct spi_message      m;
@@ -403,7 +406,7 @@ static void tpo_td043_disable(struct omap_dss_device *dssdev)
 
 static int tpo_td043_probe(struct omap_dss_device *dssdev)
 {
-       struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
+       struct tpo_td043_device *tpo_td043 = g_tpo_td043;
        int nreset_gpio = dssdev->reset_gpio;
        int ret = 0;
 
@@ -440,6 +443,8 @@ static int tpo_td043_probe(struct omap_dss_device *dssdev)
        if (ret)
                dev_warn(&dssdev->dev, "failed to create sysfs files\n");
 
+       dev_set_drvdata(&dssdev->dev, tpo_td043);
+
        return 0;
 
 fail_gpio_req:
@@ -505,6 +510,9 @@ static int tpo_td043_spi_probe(struct spi_device *spi)
                return -ENODEV;
        }
 
+       if (g_tpo_td043 != NULL)
+               return -EBUSY;
+
        spi->bits_per_word = 16;
        spi->mode = SPI_MODE_0;
 
@@ -521,7 +529,7 @@ static int tpo_td043_spi_probe(struct spi_device *spi)
        tpo_td043->spi = spi;
        tpo_td043->nreset_gpio = dssdev->reset_gpio;
        dev_set_drvdata(&spi->dev, tpo_td043);
-       dev_set_drvdata(&dssdev->dev, tpo_td043);
+       g_tpo_td043 = tpo_td043;
 
        omap_dss_register_driver(&tpo_td043_driver);
 
@@ -534,6 +542,7 @@ static int tpo_td043_spi_remove(struct spi_device *spi)
 
        omap_dss_unregister_driver(&tpo_td043_driver);
        kfree(tpo_td043);
+       g_tpo_td043 = NULL;
 
        return 0;
 }